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Superoxide radical derived metal-free spiro-OMeTAD for highly stable perovskite solar cells.
- Source :
- Nature Communications; 9/10/2024, Vol. 15 Issue 1, p1-11, 11p
- Publication Year :
- 2024
-
Abstract
- Lithium salt-doped spiro-OMeTAD is widely used as a hole-transport layer (HTL) for high-efficiency n-i-p perovskite solar cells (PSCs), but unfortunately facing awkward instability for commercialization arising from the intrinsic Li<superscript>+</superscript> migration and hygroscopicity. We herein demonstrate a superoxide radicals (•O<subscript>2</subscript><superscript>−</superscript>) derived HTL of metal-free spiro-OMeTAD with remarkable capability of avoiding the conventional tedious oxidation treatment in air for highly stable PSCs. Present work explores the employing of variant-valence Eu(TFSI)<subscript>2</subscript> salts that could generate •O<subscript>2</subscript><superscript>−</superscript> for facile and adequate pre-oxidation of spiro-OMeTAD, resulting in the HTL with dramatically increased conductivity and work function. Comparing to devices adopting HTL with LiTFSI doping, the •O<subscript>2</subscript><superscript>−</superscript>-derived spiro-OMeTAD increases the PSCs efficiency up to 25.45% and 20.76% for 0.05 cm<superscript>2</superscript> active area and 6 × 6 cm<superscript>2</superscript> module, respectively. State-of-art PSCs employing such metal-free HTLs are also demonstrated to show much-improved environmental stability even under harsh conditions, e.g., maintaining over 90% of their initial efficiency after 1000 h of operation at the maximum power point and after 80 light-thermal cycles under simulated low earth orbit conditions, respectively, indicating the potentials of developing metal-free spiro-OMeTAD for low-cost and shortened processing of perovskite photovoltaics. The migration and hygroscopicity of lithium salt in doped spiro-OMeTAD hampers the device efficiency of perovskite solar cells. Here, the authors employ Eu(TFSI)<subscript>2</subscript> salts to generate superoxide radical for facile pre-oxidation, achieving enhanced efficiency and stability of solar cells and modules. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 15
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 179553529
- Full Text :
- https://doi.org/10.1038/s41467-024-52199-4