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Chemically suppressing redox reaction at the NiOx/perovskite interface in narrow bandgap perovskite solar cells to exceed a power conversion efficiency of 20%.
- Source :
- Journal of Materials Chemistry A; 1/7/2023, Vol. 11 Issue 1, p205-212, 8p
- Publication Year :
- 2023
-
Abstract
- NiO<subscript>x</subscript> as a type of inorganic hole-transporting layer (HTL) material in narrow bandgap perovskite solar cells (NBG PSCs) showed exceptional stability but suffered a considerably poorer performance compared with NBG PSCs with commonly used PEDOT:PSS as the HTL. Herein, we found that redox reactions would occur at the interface between Ni<superscript>3+</superscript> on the NiO<subscript>x</subscript> surface and the easily oxidized Sn<superscript>2+</superscript> in the perovskite, causing considerable non-radiative recombination centers. On this basis, we proposed a bifacial reduction strategy at the interface to boost the performance of NBG PSCs. By using a reductive reagent ascorbic acid to reduce the Ni<superscript>3+</superscript>/Ni<superscript>2+</superscript> ratio on the surface of NiO<subscript>x</subscript> beforehand, the possibility of contact between Ni<superscript>3+</superscript> on the surface of NiO<subscript>x</subscript> and perovskite is chemically reduced substantially, suppressing the redox reaction between them as well as the non-radiative recombination at the interface. By applying this strategy, the device's power conversion efficiency is elevated from 17.81% to 20.48%, with 91% remaining after 1128 hours of storage in a nitrogen-filled glovebox. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 11
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 160886186
- Full Text :
- https://doi.org/10.1039/d2ta06211a