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Stable α‐FAPbI3 via porous PbI2 for efficient perovskite solar cells.
- Source :
- Journal of Chemical Physics; 11/21/2022, Vol. 157 Issue 19, p1-9, 9p
- Publication Year :
- 2022
-
Abstract
- Black-phase formamidinium lead iodide (FAPbI<subscript>3</subscript>), with a narrow bandgap and high thermal stability, has emerged as an in-demand material for highly efficient perovskite solar cells (PSCs). In a two-step sequential deposition, the PbI<subscript>2</subscript> film plays an important role in the formation of a perovskite film with desirable qualities. This paper explores using N-methyl-2-pyrrolidone (NMP), a strong Lewis base, and N,N-dimethylformamide (DMF) as a mixed precursor solvent (DMF/NMP) of PbI<subscript>2</subscript> and reports on preparing PbI<subscript>2</subscript> films with a porous morphology by thermal treatment. Porous PbI<subscript>2</subscript> films ensure the diffusion and sufficient reaction of the formamidinium iodide solution to form a smooth perovskite film. In addition, a dynamic spin coating method is also introduced to improve the uniformity of the perovskite film. Both methods yield a pure α-phase FAPbI<subscript>3</subscript> film immediately in the unannealed state, which is necessary for the perovskite film to maintain phase stability. Finally, PSCs with a power conversion efficiency of 21.20% (0.13 cm<superscript>2</superscript>) are fabricated and optimized. The unencapsulated PSCs retain 90% of the initial efficiency for 1000 hours in dry air and exhibit a good thermal stability when heated to 85 °C. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219606
- Volume :
- 157
- Issue :
- 19
- Database :
- Complementary Index
- Journal :
- Journal of Chemical Physics
- Publication Type :
- Academic Journal
- Accession number :
- 160348216
- Full Text :
- https://doi.org/10.1063/5.0122201