Self-Repairing Tin-Based Perovskite Solar Cells with a Breakthrough Efficiency Over 11

Chengbo Wang; Feidan Gu; Ziran Zhao; Haixia Rao; Yaming Qiu; Zelun Cai; Ge Zhan; Xiaoyue Li; Boxun Sun; Xiao Yu; Boqin Zhao; Zhiwei Liu; Zuqiang Bian; Chunhui Huang

doi:10.1002/adma.201907623

Self-Repairing Tin-Based Perovskite Solar Cells with a Breakthrough Efficiency Over 11

Adv Mater. 2020 Aug;32(31):e1907623. doi: 10.1002/adma.201907623. Epub 2020 Jun 25.

Authors

Chengbo Wang¹, Feidan Gu¹, Ziran Zhao¹, Haixia Rao¹, Yaming Qiu¹, Zelun Cai¹, Ge Zhan¹, Xiaoyue Li¹, Boxun Sun¹, Xiao Yu¹, Boqin Zhao¹, Zhiwei Liu¹, Zuqiang Bian¹, Chunhui Huang¹

Affiliation

¹ Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.

PMID: 32583926
DOI: 10.1002/adma.201907623

Abstract

The development of tin (Sn)-based perovskite solar cells (PSCs) is hindered by their lower power conversion efficiency and poorer stability compared to the lead-based ones, which arise from the easy oxidation of Sn²⁺ to Sn⁴⁺ . Herein, phenylhydrazine hydrochloride (PHCl) is introduced into FASnI₃ (FA = NH₂ CH  NH₂ ⁺ ) perovskite films to reduce the existing Sn⁴⁺ and prevent the further degradation of FASnI₃ , since PHCl has a reductive hydrazino group and a hydrophobic phenyl group. Consequently, the device achieves a record power conversion efficiency of 11.4% for lead-free PSCs. Besides, the unencapsulated device displays almost no efficiency reduction in a glove box over 110 days and shows efficiency recovery after being exposed to air, due to a proposed self-repairing trap state passivation process.

Keywords: Sn-based perovskite solar cells; lead-free; self-repairing; trap state passivation.