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Overcoming Moisture-Induced Degradation in Organic Solar Cells.
- Source :
- Advanced Engineering Materials; Aug2023, Vol. 25 Issue 16, p1-7, 7p
- Publication Year :
- 2023
-
Abstract
- 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 (WO<subscript>3</subscript>) 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<<WO<subscript>3</subscript><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. [ABSTRACT FROM AUTHOR]
- Subjects :
- SOLAR cells
PHOSPHOMOLYBDIC acid
TUNGSTEN oxides
CHEMICAL reactions
Subjects
Details
- Language :
- English
- ISSN :
- 14381656
- Volume :
- 25
- Issue :
- 16
- Database :
- Complementary Index
- Journal :
- Advanced Engineering Materials
- Publication Type :
- Academic Journal
- Accession number :
- 172878171
- Full Text :
- https://doi.org/10.1002/adem.202300595