Enhanced Performance of Planar Perovskite Solar Cells Induced by Van Der Waals Epitaxial Growth of Mixed Perovskite Films on WS2 Flakes

Jiupeng Cao, Guanqi Tang, Peng You, Tianyue Wang, Fangyuan Zheng, Jiong Zhao, Feng Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Organic–inorganic metal halide perovskite solar cells (PSCs) have attracted much research interest owing to their high power conversion efficiency (PCE), solution processability, and the great potential for commercialization. However, the device performance is closely related to the quality of the perovskite film and the interface properties, which cannot be easily controlled by solution processes. Here, 2D WS2 flakes with defect-free surfaces are introduced as a template for van der Waals epitaxial growth of mixed perovskite films by solution process for the first time. The mixed perovskite films demonstrate a preferable growth along (001) direction on WS2 surfaces. In addition, the WS2/perovskite heterojunction forms a cascade energy alignment for efficient charge extraction and reduced interfacial recombination. The inverted PSCs with WS2 interlayers show high PCEs up to 21.1%, which is among the highest efficiency of inverted planar PSCs. This work demonstrates that high-mobility 2D materials can find important applications in PSCs as well as other perovskite-based optoelectronic devices.

Original languageEnglish
Article number2002358
JournalAdvanced Functional Materials
Volume30
Issue number38
Early online date15 Jul 2020
DOIs
Publication statusPublished - 17 Sep 2020

Keywords

  • 2D materials
  • mixed perovskite solar cells
  • power conversion efficiency
  • van der Waals epitaxial growth
  • WS

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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