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ACS Appl Mater Interfaces. 2018 Jun 27;10(25):21343-21348. doi: 10.1021/acsami.8b06256. Epub 2018 Jun 13.

Composition Engineering in Two-Dimensional Pb-Sn-Alloyed Perovskites for Efficient and Stable Solar Cells.

Author information

1
Department of Materials Science , Fudan University , 200433 Shanghai , China.
2
Department of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden.
3
Department of Chemistry , Technical University of Denmark , DK-2800 Kongens Lyngby , Denmark.

Abstract

Environmentally friendly tin (Sn)-based metallic halide perovskites suffer from oxidation and morphological issues. Here, we demonstrate the composition engineering of Pb-Sn-alloyed two-dimensional (2D) Ruddlesden-Popper perovskites, (BA)2(MA)3Pb4- xSn xI13, for efficient and stable solar cell applications. Smooth thin films with high surface coverage are readily formed without using any additive owing to the self-assembly characteristic of 2D perovskites. It is found that Sn plays a significant role in improving the crystallization and crystal orientation while narrowing the bandgap of Pb-Sn 2D perovskites. Photophysical studies further reveal that the optimal Sn ratio (25 mol %) based sample exhibits both minimized trap density and weakened quantum confinement for efficient charge separation. Consequently, the optimized (BA)2(MA)3Pb3SnI13-based solar cells yield the best power conversion efficiency close to 6% with suppressed hysteresis.

KEYWORDS:

composition engineering; organic−inorganic hybrid perovskites; planar solar cells; tin-based perovskites; two-dimensional

PMID:
29870223
DOI:
10.1021/acsami.8b06256

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