Back to Search
Start Over
Stable α-FAPbI 3 via porous PbI 2 for efficient perovskite solar cells.
- Source :
-
The Journal of chemical physics [J Chem Phys] 2022 Nov 21; Vol. 157 (19), pp. 194704. - 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.
Details
- Language :
- English
- ISSN :
- 1089-7690
- Volume :
- 157
- Issue :
- 19
- Database :
- MEDLINE
- Journal :
- The Journal of chemical physics
- Publication Type :
- Academic Journal
- Accession number :
- 36414458
- Full Text :
- https://doi.org/10.1063/5.0122201