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-xSnxI13, 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.
Original language | English |
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Journal | ACS Applied Materials and Interfaces |
Volume | 10 |
Issue number | 25 |
Pages (from-to) | 21343-21348 |
ISSN | 1944-8244 |
DOIs | |
Publication status | Published - 27 Jun 2018 |
Keywords
- Composition engineering
- Organic-inorganic hybrid perovskites
- Planar solar cells
- Tin-based perovskites
- Two-dimensional