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

Yani Chen, Yong Sun, Jiajun Peng, Pavel Chábera, Alireza Honarfar, Kaibo Zheng*, Ziqi Liang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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 languageEnglish
JournalACS Applied Materials and Interfaces
Volume10
Issue number25
Pages (from-to)21343-21348
ISSN1944-8244
DOIs
Publication statusPublished - 27 Jun 2018

Keywords

  • Composition engineering
  • Organic-inorganic hybrid perovskites
  • Planar solar cells
  • Tin-based perovskites
  • Two-dimensional

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