Enhanced Charge Transport by Incorporating Formamidinium and Cesium Cations into Two-Dimensional Perovskite Solar Cells

Liguo Gao, Fei Zhang, Xihan Chen, Chuanxiao Xiao, Bryon W. Larson, Sean P. Dunfield, Joseph J. Berry, Kai Zhu

Research output: Contribution to journalArticlepeer-review

71 Scopus Citations

Abstract

Organic-inorganic hybrid two-dimensional (2D) perovskites (n≤5) have recently attracted significant attention because of their promising stability and optoelectronic properties. Normally, 2D perovskites contain a monocation [e.g., methylammonium (MA+) or formamidinium (FA+)]. Reported here for the first time is the fabrication of 2D perovskites (n=5) with mixed cations of MA+, FA+, and cesium (Cs+). The use of these triple cations leads to the formation of a smooth, compact surface morphology with larger grain size and fewer grain boundaries compared to the conventional MA-based counterpart. The resulting perovskite also exhibits longer carrier lifetime and higher conductivity in triple cation 2D perovskite solar cells (PSCs). The power conversion efficiency (PCE) of 2D PSCs with triple cations was enhanced by more than 80 % (from 7.80 to 14.23 %) compared to PSCs fabricated with a monocation. The PCE is also higher than that of PSCs based on binary cation (MA+-FA+ or MA+-Cs+) 2D structures.

Original languageAmerican English
Pages (from-to)11737-11741
Number of pages5
JournalAngewandte Chemie - International Edition
Volume58
Issue number34
DOIs
StatePublished - 2019

Bibliographical note

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

NREL Publication Number

  • NREL/JA-5900-73862

Keywords

  • cations
  • cesium
  • charge transport
  • perovskite phases
  • solar cells

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