B Min; P Noack; B Wattenberg; T Dippell; H Schulte-Huxel; R Peibst; R Brendel
Wet-Chemically Grown Interfacial Oxide for Passivating Contacts Fabricated With an Industrial Inline Processing System Artikel Geplante Veröffentlichung
In: IEEE Journal of Photovoltaics, Geplante Veröffentlichung.
@article{Min2024,
title = {Wet-Chemically Grown Interfacial Oxide for Passivating Contacts Fabricated With an Industrial Inline Processing System},
author = {B Min and P Noack and B Wattenberg and T Dippell and H Schulte-Huxel and R Peibst and R Brendel},
doi = {10.1109/JPHOTOV.2024.3352836},
year = {2024},
date = {2024-01-22},
urldate = {2024-01-01},
journal = {IEEE Journal of Photovoltaics},
abstract = {This article presents for the first time the application of wet-chemical interfacial oxide from an industrial inline processing system for poly-Si-based passivating contacts. An excellent passivation quality is achieved by creating an interfacial oxide with a very short exposure time of 90 s in ozonized water and by adjusting the annealing temperature in a tube furnace, resulting in surface recombination current densities of 4 fA/cm 2 and 1.2 fA/cm 2 before and after a hydrogenation step, respectively. Detailed electrical characterization reveals the interplay of in-diffusion of P into the wafer and hydrogenation step. Our investigation shows that the optimum annealing temperature can differ before and after the hydrogenation step. The developed wet-chemical interfacial oxide is successfully implemented in back junction solar cells on large-area gallium-doped p-type silicon wafers (156.75 × 156.75 mm 2 ) featuring a phosphorus-doped poly-Si-based passivating contact at the rear side. The best cell has an efficiency of 23.6% and an open-circuit voltage of 719 mV, independently confirmed by ISFH CalTeC in Germany. Our cost calculation shows a saving of up to 17.2% in capital expenditure, 5.2% p.a. in operating expense, and 9.0% in the footprint if the interfacial oxide is formed by an inline wet-chemical processing system instead of a plasma chamber.},
keywords = {},
pubstate = {forthcoming},
tppubtype = {article}
}
L Salomon; G Wetzel; J Krügener; R Peibst
In: Solar RRL, Bd. 8, Ausg. 2, S. 2300795, 2024.
@article{Salomon2024,
title = {Assessment of the Required Maximum-Power-Point-Tracking Speed for Vehicle-Integrated Photovoltaics Based on Transient Irradiation Measurements and Dynamic Electrical Modeling},
author = {L Salomon and G Wetzel and J Krügener and R Peibst},
doi = {10.1002/solr.202300795},
year = {2024},
date = {2024-01-01},
urldate = {2023-11-13},
journal = {Solar RRL},
volume = {8},
issue = {2},
pages = {2300795},
abstract = {Fast changing irradiation on vehicle-integrated photovoltaic (VIPV) modules may impose demanding requirements for maximum power point tracking (MPPT) to ensure high energy conversion efficiency. In this work, the results of simulations regarding the output and efficiency of an exemplary VIPV module under real-life irradiation conditions as measured with high time resolution are resulted. Herein, resistive as well as voltage source load is used as two idealized models of the MPPT. The simulations show that, in most cases, tracking with a resistive load at 1 Hz preserves above 90%rel of the convertible energy determined by the cell performances under given irradiance levels. With a voltage source load, these values do not undercut 97%rel at 0.1 Hz. Herein, it is also found that partial shading across the exemplary series connected module can reduce the converted energy in the range of 5–10%rel in relation to complete negligence of this effect.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
H Schulte-Huxel; T Daschinger; B Min; T Brendemühl; R Brendel
Novel busbar design for screen-printed front side Al metallization of high-efficiency solar cell Artikel
In: Solar Energy Materials and Solar Cells, Bd. 264, S. 112601, 2024, ISSN: 0927-0248.
@article{Schulte-Huxel2024,
title = {Novel busbar design for screen-printed front side Al metallization of high-efficiency solar cell},
author = {H Schulte-Huxel and T Daschinger and B Min and T Brendemühl and R Brendel},
doi = {10.1016/j.solmat.2023.112601},
issn = {0927-0248},
year = {2024},
date = {2024-01-01},
urldate = {2024-01-01},
journal = {Solar Energy Materials and Solar Cells},
volume = {264},
pages = {112601},
abstract = {The need to reduce the silver consumption for future global PV production requires novel approaches for cell metallization and module integration. A screen-printed aluminum cell metallization on the front side could contribute here, but requires a redesign of the solder pads and busbars. A compromise between shading and resistive losses is needed. We investigate the inclusion of Ag solder pads in high-aspect-ratio Al finger grids on the front side of p-type back junction solar cells featuring passivating polysilicon on oxide (POLO) contacts on the rear side. In order to determine the optimal geometric dimensions of the solder pads, we characterize the resistance at the interface between the Ag solder pads and the Al finger grid in dependence on the size of the overlap between the two paste. A contact resistance of 285 mΩ is determined for 200 μm-narrow Al busbars and small solder pads of 750 μm in length. This would require tens of solder pads per busbar for acceptable power losses below 0.5 % coming along with significant shading. Therefore, a new metallization design is developed. We use narrow Ag busbars with a widened intersection to the Al fingers in order to reduce the contact resistance caused by the Ag–Al alloy. Thereby, the shading losses of the solderable busbars and pads are less than 1.5 %.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
K Timilsina
PVT-Wärmepumpensysteme für die optimale Nutzung von Solarenergie und Umweltwärme Sonstige
Solarbrief des Solarförderverein SFV e.V. 3-2023, 2023.
@misc{Timilsina2023c,
title = {PVT-Wärmepumpensysteme für die optimale Nutzung von Solarenergie und Umweltwärme},
author = {K Timilsina},
year = {2023},
date = {2023-12-01},
urldate = {2023-12-01},
issue = {3-2023},
howpublished = {Solarbrief des Solarförderverein SFV e.V. 3-2023},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
M Herz; G Friesen; U Jahn; M Koentges; S Lindig; D Moser
Identify, analyse and mitigate—Quantification of technical risks in PV power systems Artikel
In: Progress in Photovoltaics: Research and Applications, Bd. 31, Nr. 12, S. 1285-1298, 2023.
@article{Herz2023,
title = {Identify, analyse and mitigate—Quantification of technical risks in PV power systems},
author = {M Herz and G Friesen and U Jahn and M Koentges and S Lindig and D Moser},
doi = {10.1002/pip.3633},
year = {2023},
date = {2023-12-01},
urldate = {2023-01-01},
journal = {Progress in Photovoltaics: Research and Applications},
volume = {31},
number = {12},
pages = {1285-1298},
abstract = {Technical risks are important criteria to consider when investing in new and existing PV installations. Quantitative knowledge of these risks is one of the key factors for the different stakeholders, such as asset managers, banks or project developers, to make reliable business decisions before and during the operation of their PV assets. Within the IEA PVPS Task 13 Expert Group, we aim to increase the knowledge on methodologies to assess technical risks and mitigation measures in terms of economic impact and effectiveness. The developed outline provides a reproducible and transparent technique to manage the complexity of risk analysis and processing in order to establish a common practice for professional risk assessment. Semi-quantitative and quantitative methodologies are introduced to assess technical risks in PV power systems and provide examples of common technical risks described and rated in the new created PV failure fact sheets (PVFS). Besides the PVFS based on expert knowledge and expert opinion, an update on the statistics of the PV failure degradation survey is given. With the knowledge acquired and data collected, the risk and cost–benefit analysis is demonstrated in a case study that shows methods for prioritising decisions from an economic perspective and provided important results for risk managing strategies.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Loic Tous; Jonathan Govaert; Samuel Harrison; Carolyn Carrière; Vincent Barth; Valentin Giglia; Florian Buchholz; Ning Chen; Andreas Halm; Antonin Faes; Gizem Nogay; Hugo Quest; Torsten Roessler; Tobias Fellmeth; Dirk Reinwand; Hannah Stolzenburg; Florian Schindler; Max Mittag; Arnaud Morlier; Matevz Bokalic; Kristijan Brecl; Miha Kikelj; Marko Topic; Josco Kester; Stefan Wendlandt; Marco Galiazzo; Alessandro Voltan; Giuseppe Galbiati; Marc Estruga Ortiga; Frank Torregrosa; Michael Grimm; Julius Denafas; Tadas Radavicius; Povilas Lukinskas; Tuukka Savisalo; Thomas Regrettier; Ivan Gordon
In: Progress in Photovoltaics: Research and Applications, Bd. 31, Ausg. 12, S. 1409-1427, 2023.
@article{Tous2023,
title = {Overview of key results achieved in H2020 HighLite project helping to raise the EU PV industries' competitiveness},
author = {Loic Tous and Jonathan Govaert and Samuel Harrison and Carolyn Carrière and Vincent Barth and Valentin Giglia and Florian Buchholz and Ning Chen and Andreas Halm and Antonin Faes and Gizem Nogay and Hugo Quest and Torsten Roessler and Tobias Fellmeth and Dirk Reinwand and Hannah Stolzenburg and Florian Schindler and Max Mittag and Arnaud Morlier and Matevz Bokalic and Kristijan Brecl and Miha Kikelj and Marko Topic and Josco Kester and Stefan Wendlandt and Marco Galiazzo and Alessandro Voltan and Giuseppe Galbiati and Marc Estruga Ortiga and Frank Torregrosa and Michael Grimm and Julius Denafas and Tadas Radavicius and Povilas Lukinskas and Tuukka Savisalo and Thomas Regrettier and Ivan Gordon},
doi = {10.1002/pip.3667},
year = {2023},
date = {2023-12-01},
urldate = {2023-01-12},
journal = {Progress in Photovoltaics: Research and Applications},
volume = {31},
issue = {12},
pages = {1409-1427},
abstract = {The EU crystalline silicon (c-Si) PV manufacturing industry has faced strong foreign competition in the last decade. To strive in this competitive environment and differentiate itself from the competition, the EU c-Si PV manufacturing industry needs to (1) focus on highly performing c-Si PV technologies, (2) include sustainability by design, and (3) develop differentiated PV module designs for a broad range of PV applications to tap into rapidly growing existing and new markets. This is precisely the aim of the 3.5 years long H2020 funded HighLite project, which started in October 2019 under the work program LC-SC3-RES-15-2019: Increase the competitiveness of the EU PV manufacturing industry. To achieve this goal, the HighLite project focuses on bringing two advanced PV module designs and the related manufacturing solutions to higher technology readiness levels (TRL). The first module design aims to combine the benefits of n-type silicon heterojunction (SHJ) cells (high efficiency and bifaciality potential, improved sustainability, rapidly growing supply chain in the EU) with the ones of shingle assembly (higher packing density, improved modularity, and excellent aesthetics). The second module design is based on the assembly of low-cost industrial interdigitated back-contact (IBC) cells cut in half or smaller, which is interesting to improve module efficiencies and increase modularity (key for application in buildings, vehicles, etc.). This contribution provides an overview of the key results achieved so far by the HighLite project partners and discusses their relevance to help raise the EU PV industries' competitiveness. We report on promising high-efficiency industrial cell results (24.1% SHJ cell with a shingle layout and 23.9% IBC cell with passivated contacts), novel approaches for high-throughput laser cutting and edge re-passivation, module designs for BAPV, BIPV, and VIPV applications passing extended testing, and first 1-year outdoor monitoring results compared with benchmark products.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
H Schulte-Huxel; R Witteck; S Blankemeyer; M Köntges
Optimal interconnection of three-terminal tandem solar cells Artikel
In: Progress in Photovoltaics: Research and Applications, Bd. 31, Ausg. 12, S. 1350-1359, 2023.
@article{Schulte-Huxel2022c,
title = {Optimal interconnection of three-terminal tandem solar cells},
author = {H Schulte-Huxel and R Witteck and S Blankemeyer and M Köntges},
doi = {10.1002/pip.3643},
year = {2023},
date = {2023-12-01},
urldate = {2022-11-13},
journal = {Progress in Photovoltaics: Research and Applications},
volume = {31},
issue = {12},
pages = {1350-1359},
abstract = {Three-terminal (3T) tandem solar cells require an adapted module integration scheme in order to explore their full efficiency potential. The three terminals allow to extract the power of the top and bottom cell separately. In a cell string, the wide bandgap top cells are interconnected in parallel to multiple bottom cells resulting in a parallel/series interconnection. This interconnection scheme affects the operation of the subcells, the resulting current path between the subcells, the layout of the cell interconnects, and the system level. Here, we analyze by simulations and experiments the aspects of the module integration of series- and reverse-connected 3T cells with their practical impact on module processes and performance as well as the effect of varying voltage ratios on the string-end losses. If the subcells are connected in series, the module integration requires insulation layers and significantly longer interconnects compared to devices with reverse-connected subcells. Tandem devices with a reverse connection and a voltage ratio between top and bottom cell of 2:1 allow a lean interconnection design and low integration losses. We present an approach for the integration of bypass diodes for the protection against shading effects that allow to minimize string-end and shading losses for a system of modules featuring 3T cells.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
M Schlemminger; D Bredemeier; A Mahner; R Niepelt; M H Breitner; R Brendel
Storage Requirements in Urban Energy Systems for the Integration of Rooftop Photovoltaics Vortrag
Aachen, Germany, 30.11.2023, (International Renewable Energy Storage Conference IRES 2023).
@misc{Schlemminger2023,
title = {Storage Requirements in Urban Energy Systems for the Integration of Rooftop Photovoltaics},
author = {M Schlemminger and D Bredemeier and A Mahner and R Niepelt and M H Breitner and R Brendel},
year = {2023},
date = {2023-11-30},
address = {Aachen, Germany},
note = {International Renewable Energy Storage Conference IRES 2023},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
D Bredemeier; C Schinke; R Niepelt; R Brendel
Large-scale spatiotemporal calculation of photovoltaic capacity factors using ray tracing: A case study in urban environments Artikel Geplante Veröffentlichung
In: Progress in Photovoltaics: Research and Applications, Geplante Veröffentlichung.
@article{Bredemeier2023,
title = {Large-scale spatiotemporal calculation of photovoltaic capacity factors using ray tracing: A case study in urban environments},
author = {D Bredemeier and C Schinke and R Niepelt and R Brendel},
doi = {10.1002/pip.3756},
year = {2023},
date = {2023-11-29},
journal = {Progress in Photovoltaics: Research and Applications},
abstract = {Photovoltaics (PVs) on building facades, either building-integrated or building-attached, offer a large energy yield potential especially in densely populated urban areas. Targeting this potential requires the availability of planning tools such as insolation forecasts. However, calculating the PV potential of facade surfaces in an urban environment is challenging. Complex time-dependent shadowing and light reflections must be considered. In this contribution, we present fast ray tracing calculations for insolation forecasts in large urban environments using clustering of Sun positions into typical days. We use our approach to determine time resolved PV capacity factors for rooftops and facades in a wide variety of environments, which is particularly useful for energy system analyses. The advantage of our approach is that the determined capacity factors for one geographic location can be easily extended to larger geographic regions. In this contribution, we perform calculations in three exemplary environments and extend the results globally. Especially for facade surfaces, we find that there is a pronounced intra-day and also seasonal distribution of PV potentials that strongly depends on the degree of latitude. The consideration of light reflections in our ray tracing approach causes an increase in calculated full load hours for facade surfaces between 10% and 25% for most geographical locations.},
keywords = {},
pubstate = {forthcoming},
tppubtype = {article}
}
T Ernst; B Lim; C Schinke; R Puknat; T Gewohn; R Niepelt
Viability of Various Temperature Models for Façade PV in Moderate Climates Proceedings Article
In: WIP, (Hrsg.): Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition, S. 020456, Lisbon, Portugal, 2023.
@inproceedings{Ernst2023b,
title = {Viability of Various Temperature Models for Façade PV in Moderate Climates},
author = {T Ernst and B Lim and C Schinke and R Puknat and T Gewohn and R Niepelt},
editor = {WIP},
doi = {10.4229/EUPVSEC2023/4DV.4.24},
year = {2023},
date = {2023-11-28},
booktitle = {Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition},
pages = {020456},
address = {Lisbon, Portugal},
abstract = {This work presents the results of an investigation into the viability of several models that are commonly used to simulate the PV module temperature. In the past, these models, namely, Faiman-, King- and NOCT-model, were validated mostly for rooftop PV and in hotter climates. We test these models for façade PV in moderate climates and show that the annual average deviation between the PV module temperature simulated with those models and the measured PV module temperature is below 3.1 K between the hours of 09:00 – 16:00 for all models used. With exception of the NOCT-model all models include fitting coefficients. Fitting those coefficients to measurement data obtained in moderate climate and for façade PV does not yield an improvement (i.e. no smaller annual average deviation between simulated and measured module temperature within measurement precision). Applying a simple 10 min. rolling average to the simulated temperature data yields similar or better results compared to the fitting of the model coefficients to the dataset. Even though the NOCT-model does not include the effect of wind speed, in contrast to the other models mentioned, it showed a very competitive performance.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
V Mertens; S Dorn; J Langlois; M Stöhr; Y Larionova; R Brendel; N Ambrosius; A Vogt; T Pernau; H Haverkamp; T Dullweber
Study of Different Interfacial Oxides for Industrial N-Poly Si Passivation on Polo-IBC Solar Cells Proceedings Article
In: WIP, (Hrsg.): Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition, S. 020015, Lisbon, Portugal, 2023.
@inproceedings{Mertens2023b,
title = {Study of Different Interfacial Oxides for Industrial N-Poly Si Passivation on Polo-IBC Solar Cells},
author = {V Mertens and S Dorn and J Langlois and M Stöhr and Y Larionova and R Brendel and N Ambrosius and A Vogt and T Pernau and H Haverkamp and T Dullweber},
editor = {WIP},
doi = {10.4229/EUPVSEC2023/1BO.3.3},
year = {2023},
date = {2023-11-28},
booktitle = {Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition},
pages = {020015},
address = {Lisbon, Portugal},
abstract = {We present investigations on in situ grown PECVD interfacial oxides for PECVD n-poly Si. In this study we investigate the impact of thickness variation of PECVD oxide layers and compare two different variants of PECVD oxides, grown in N2O plasma (SiOxNy) or O2 plasma (SiOx) with oxygen as environmentally friendly alternative as oxidant. For these experiments we use an industrial centrotherm tool for PECVD deposition. We perform our study on POLO IBC solar cells using p-type silicon wafers in M2 format and with our masking process, using LIDE processed (Laser Induced Deep Etching) glass shadow masks for structured deposition of PECVD n-amorphous silicon to form the IBC pattern on the rear side of the solar cells. The PECVD oxides are formed in situ through the glass shadow mask directly before the deposition of PECVD-n-amorphous Si. The POLO IBC cell efficiencies show that the PECVD oxides SiOxNy and SiOx with optimized thickness outperform our wet chemical SiOx with maximum efficiency of 23.8% and 23.7%, respectively. These data demonstrate the feasibility to deposit a high-quality in situ PECVD interfacial oxide for optimum surface passivation and current transport of passivated contacts at the same time.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
B Min; F Haase; T Brendemühl; K Tsuji; M Dhamrin; R Peibst; R Brendel
All-Aluminum Screen-Printed POLO Back Junction Solar Cells Proceedings Article
In: WIP, (Hrsg.): Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition, S. 020044, Lisbon, Portugal, 2023.
@inproceedings{Min2023d,
title = {All-Aluminum Screen-Printed POLO Back Junction Solar Cells},
author = {B Min and F Haase and T Brendemühl and K Tsuji and M Dhamrin and R Peibst and R Brendel},
editor = {WIP},
doi = {10.4229/EUPVSEC2023/1CV.3.2},
year = {2023},
date = {2023-11-28},
booktitle = {Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition},
pages = {020044},
address = {Lisbon, Portugal},
abstract = {In this work, we present our current development status of all-aluminum screen-printed p-type back junction (BJ) solar cells featuring passivating polysilicon on oxide (POLO) rear contact. We achieve a contact resistivity with a median of 2 mΩcm2 between screen-printed Al and poly-Si, measured with the transfer-length-method (TLM). The laser contact opening process is essential to achieve such low contact resistivity since it changes the surface morphology of poly-Si layer beneath AlOx/SiNy dielectric stack and improves the contact formation. Our investigation of the co-firing of the front and rear Al grids in a single firing step shows that a restriction of the peak firing temperature to around 700 °C is needed to avoid a strong deterioration of POLO contacts caused by screen-printed Al paste at the cell rear side. Since this temperature range is not sufficiently high to form the p+-type layer beneath the front Al fingers properly, we first fire the front Al grids by a peak firing temperature of 810 °C. Subsequently, we screen-print the rear Al grid and fire the samples in a second firing step with a peak firing temperature range between 660 °C and 740 °C. We achieve a Voc of 700 mV with the best all-aluminum screen-printed POLO BJ solar cell fabricated with a gallium-doped Cz silicon wafer.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
W Wirtz; J Eilrich; A Morlier; S Bräunig; S Blankemeyer; H Schulte-Huxel
3D Lamination for Flexible Manufacturing of Variously Shaped VIPV Modules Proceedings Article
In: WIP, (Hrsg.): Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition, S. 020332, Lisbon, Portugal, 2023.
@inproceedings{Wirtz2023b,
title = {3D Lamination for Flexible Manufacturing of Variously Shaped VIPV Modules},
author = {W Wirtz and J Eilrich and A Morlier and S Bräunig and S Blankemeyer and H Schulte-Huxel},
editor = {WIP},
doi = {10.4229/EUPVSEC2023/4BV.3.41},
year = {2023},
date = {2023-11-28},
urldate = {2023-11-28},
booktitle = {Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition},
pages = {020332},
address = {Lisbon, Portugal},
abstract = {Integration of photovoltaics (PV) into surfaces that are so far not used for electrical power generation often demands new designs of PV modules. Such new module shapes can include curvatures in three dimensions, which can in general not be handled in standard PV module production processes. In this work, an alternative lamination process using a flexible heat transfer mold (FlexHTM) is presented. The flexible heat transfer mold consists of deformable heat transfer cushions filled with a thermally conductive granulate. The mold supports the heat transfer from a flat heating element to a curved module stack and simultaneously prevents the module shape from deformation during vacuum lamination. The deformable properties enable the adaptation of the flexible heat transfer mold to differently shaped and structured PV modules, which is advantageous over the use of costly massive metallic molds. Several differently shaped PV modules for vehicle integration were manufactured from interdigitated back contact (IBC) solar cells on passenger car hoods with the FlexHTM method, showing its flexibility and ability to produce mechanically stable and aesthetically appealing curved VIPV modules.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
B Min; V Mertens; Y Larionova; T Pernau; H Haverkamp; T Dullweber; R Peibst; R Brendel
24.2%-Efficient POLO Back Junction Solar Cell with Industrial PECVD AlOx/SiNy Passivation Proceedings Article
In: WIP, (Hrsg.): Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition, S. 020003, Lisbon, Portugal, 2023.
@inproceedings{Min2023c,
title = {24.2%-Efficient POLO Back Junction Solar Cell with Industrial PECVD AlOx/SiNy Passivation},
author = {B Min and V Mertens and Y Larionova and T Pernau and H Haverkamp and T Dullweber and R Peibst and R Brendel},
editor = {WIP},
doi = {10.4229/EUPVSEC2023/1AO.5.2},
year = {2023},
date = {2023-11-28},
urldate = {2023-11-28},
booktitle = {Proceedings of the 40th European Photovoltaic Solar Energy Conference and Exhibition},
pages = {020003},
address = {Lisbon, Portugal},
abstract = {In this work, we transfer the cleaning and passivation steps for fabricating our p-type back junction (BJ) solar cells featuring passivating polysilicon on oxide (POLO) rear contacts from lab scale to industrial processes and equipment. We therefore develop an industrial PECVD AlOx/SiNy passivation stack with excellent passivation quality on the undiffused textured p-type crystalline silicon surface. In addition, we replace the RCA clean with an industrial cleaning sequence using HCl/O3. We integrate the developed industrial cleaning and passivation processes into our current POLO BJ cell fabrication flow, resulting in a cell performance which is at the same level as the reference which we fabricate with a lab-scale processes. For the industrial process we determine a surface recombination current density J0s of 4 fA/cm² for the passivated undiffused and textured surface from comparing measurements on lifetime samples with numerical device simulations. This value is on the same level as that of the reference sample passivated with an ALD AlOx layer capped by a PECVD SiNy layer. The novel PECVD AlOx/SiNy passivation stack is successfully integrated into our current cell fabrication process: Our best POLO BJ solar cell has an efficiency of 24.2 % with an open-circuit voltage of 725 mV on a cell area of 244.5 cm² using p-type Ga-doped Czochralski Si, as independently confirmed by ISFH CalTeC. To our knowledge, this is the first report on high quality industrial cleaning and dielectric passivation on textured and undiffused p-type crystalline silicon surfaces.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
F Hüsing; M Loth
Trinkwassererwärmung mit Wärmepumpen – Effizienzbewertung für Systeme mit großen Pufferspeichern Vortrag
Hannover, Germany, 23.11.2023, (Deutsche Kälte- und Klimatagung 2023).
@misc{Hüsing2023f,
title = {Trinkwassererwärmung mit Wärmepumpen – Effizienzbewertung für Systeme mit großen Pufferspeichern},
author = {F Hüsing and M Loth},
year = {2023},
date = {2023-11-23},
address = {Hannover, Germany},
note = {Deutsche Kälte- und Klimatagung 2023},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
M Köntges
Schäden, Ausfallraten und Degradation in PV-Anlagen Vortrag
Bad Nenndorf, Germany, 22.11.2023, (Elektrotechnik Herbstseminar Niedersächsisches Landesamt für Bau und Liegenschaften).
@misc{Köntges2023e,
title = {Schäden, Ausfallraten und Degradation in PV-Anlagen},
author = {M Köntges},
year = {2023},
date = {2023-11-22},
address = {Bad Nenndorf, Germany},
note = {Elektrotechnik Herbstseminar Niedersächsisches Landesamt für Bau und Liegenschaften},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
M Köntges
Aktuelle Photovoltaik Technologien und besondere Anwendungen Vortrag
Bad Nenndorf, Germany, 22.11.2023, (Elektrotechnik Herbstseminar Niedersächsisches Landesamt für Bau und Liegenschaften).
@misc{Köntges2023d,
title = {Aktuelle Photovoltaik Technologien und besondere Anwendungen},
author = {M Köntges},
year = {2023},
date = {2023-11-22},
address = {Bad Nenndorf, Germany},
note = {Elektrotechnik Herbstseminar Niedersächsisches Landesamt für Bau und Liegenschaften},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
M Köntges
Wandel der politischen Rahmenbedingungen für Photovoltaik (in Niedersachsen) 2023/24 Vortrag
Bad Nenndorf, Germany, 22.11.2023, (Elektrotechnik Herbstseminar Niedersächsisches Landesamt für Bau und Liegenschaften).
@misc{Köntges2023f,
title = {Wandel der politischen Rahmenbedingungen für Photovoltaik (in Niedersachsen) 2023/24},
author = {M Köntges},
year = {2023},
date = {2023-11-22},
urldate = {2023-11-22},
address = {Bad Nenndorf, Germany},
note = {Elektrotechnik Herbstseminar Niedersächsisches Landesamt für Bau und Liegenschaften},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
M Köntges
Solarenergieforschung am ISFH Vortrag
Bad Nenndorf, Germany, 22.11.2023, (Elektrotechnik Herbstseminar Niedersächsisches Landesamt für Bau und Liegenschaften).
@misc{Köntges2023b,
title = {Solarenergieforschung am ISFH },
author = {M Köntges},
year = {2023},
date = {2023-11-22},
address = {Bad Nenndorf, Germany},
note = {Elektrotechnik Herbstseminar Niedersächsisches Landesamt für Bau und Liegenschaften},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
D Bredemeier; M Schlemminger; P Kühne; T Wietler; R Niepelt; R Brendel
Viel Sonne in Niedersachsen - Ein detaillierter Blick auf Solarenergiepotenziale auf Dächern und Fassaden Vortrag
Hannover, Germany, 20.11.2023, (15. Niedersächsische Energietage).
@misc{Bredemeier2023b,
title = {Viel Sonne in Niedersachsen - Ein detaillierter Blick auf Solarenergiepotenziale auf Dächern und Fassaden},
author = {D Bredemeier and M Schlemminger and P Kühne and T Wietler and R Niepelt and R Brendel},
year = {2023},
date = {2023-11-20},
urldate = {2023-11-23},
address = {Hannover, Germany},
note = {15. Niedersächsische Energietage},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}