Overcoming Moisture-Induced Degradation in Organic Solar Cells
| العنوان: | Overcoming Moisture-Induced Degradation in Organic Solar Cells |
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| المؤلفون: | Wachsmuth, Josua, Distler, Andreas, Deribew, Dargie, Salvador, Michael, Brabec, Christoph J., Egelhaaf, Hans-Joachim |
| المصدر: | Advanced Engineering Materials. :1-7 |
| مصطلحات موضوعية: | Conducting polymers, Hole mobility, Moisture, Organic solar cells, Solar power generation, %moisture, Active Layer, Cell/B.E, Damp heat, Degradation and stability, Induced degradation, Organic photovoltaics, PEDOT/PSS, Phosphomolybdic acid, Solution-processed, Tungsten compounds, Physics, Fysik |
| الوصف: | Unencapsulated organic solar cells are prone to severe performance losses in the presence of moisture. Accelerated damp heat (85 °C/85% RH) studies are presented and it is shown that the hygroscopic hole-transporting PEDOT:PSS layer is the origin of device failure in the case of prototypical inverted solar cells. Complementary measurements unveil that under these conditions a decreased PEDOT:PSS work function along with areas of reduced electrical contact between active layer and hole-transport layer are the main factors for device degradation rather than a chemical reaction of water with the active layer. Replacements for PEDOT:PSS are explored and it is found that tungsten oxide (WO3) or phosphomolybdic acid (PMA)—materials that can be processed from benign solvents at room temperature—yields comparable performance as PEDOT:PSS and enhances the resilience of solar cells under damp heat. The stability trend follows the order PEDOT:PSS << WO3 < PMA, with PEDOT:PSS-based devices failing after few minutes, while PMA-based devices remain nearly pristine over several hours. PMA is thus proposed as a robust, solution-processable hole extraction layer that can act as a one to one replacement of PEDOT:PSS to achieve organic solar cells with significantly improved longevity. |
| وصف الملف: | electronic |
| URL الوصول: | https://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-95224 https://doi.org/10.1002/adem.202300595 https://kau.diva-portal.org/smash/get/diva2:1769136/FULLTEXT01.pdf |
| قاعدة البيانات: | SwePub |
| تدمد: | 14381656 |
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| DOI: | 10.1002/adem.202300595 |