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Ca(CF3SO3)2 all-in-one modification on CsPbI3 all-inorganic perovskite solar cells for improved performance and stability.
- Source :
-
Applied Physics Letters . 5/20/2024, Vol. 124 Issue 21, p1-8. 8p. - Publication Year :
- 2024
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Abstract
- Due to the low tolerance factor, the black-phase CsPbI3 could easily transform into the photovoltaic-inactive yellow phase under the pressure of moisture, restricting the performance and stability of corresponding solar cells. Here, Ca(CF3SO3)2 is introduced into CsPbI3 to solve this problem. The Ca2+ cations could interact with Iā ions to inhibit ion migration and prevent the collapse of the perovskite structure, while the CF3SO3ā anions anchoring on the crystal surface could provide hydrophobicity. Ca(CF3SO3)2 introduction, thus, increases the intrinsic and extrinsic stability of black-phase CsPbI3 simultaneously. The interaction between Ca(CF3SO3)2 and perovskite precursors retards the crystallization process and facilitates the growth of high-quality films with reduced non-radiative recombination. Moreover, the CF3SO3ā anions on the surface induce p-type doping and modify the energy level alignment with the hole transport layer. Benefiting from the Ca(CF3SO3)2 introduction, the CsPbI3 all-inorganic perovskite solar cells exhibit improved power conversion efficiency (PCE) from 14.76% to 16.50%. In addition, the unencapsulated device with Ca(CF3SO3)2 retains 81% of its original PCE after storage in air for 500 h, outperforming that of the control device (65%). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 124
- Issue :
- 21
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 177456345
- Full Text :
- https://doi.org/10.1063/5.0202338