20% efficient perovskite solar cells with 2D electron transporting layer

Xiaojuan Zhao, Shuangshuang Liu, Haitao Zhang, Sheng Yung Chang, Wenchao Huang, Bowen Zhu, Yan Shen, Cai Shen, Deyu Wang, Yang Yang, Mingkui Wang

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

Herein, a 2D SnS2 electron transporting layer is reported via self-assembly stacking deposition for highly efficient planar perovskite solar cells, achieving over 20% power conversion efficiency under AM 1.5 G 100 mW cm−2 light illumination. To the best of the authors' knowledge, this represents the highest efficiency that has so far been reported for perovskite solar cells using a 2D electron transporting layer. The large-scaled 2D multilayer SnS2 sheet structure triggers a heterogeneous nucleation over the perovskite precursor film. The intermolecular Pb⋅⋅⋅S interactions between perovskite and SnS2 could passivate the interfacial trap states, which suppress charge recombination and thus facilitate electron extraction for balanced charge transport at interfaces between electron transporting layer/perovskite and hole transporting layer/perovskite. This work demonstrates that 2D materials have great potential for high-performance perovskite solar cells.

Original languageEnglish
Article number1805168
Number of pages8
JournalAdvanced Functional Materials
Volume29
Issue number4
DOIs
Publication statusPublished - 24 Jan 2019

Keywords

  • defect physics
  • exciton
  • perovskite solar cell
  • stability
  • substitution

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