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

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

doi:10.1002/ange.201905690

Title: Enhanced Charge Transport by Incorporating Formamidinium and Cesium Cations into Two‐Dimensional Perovskite Solar Cells

Journal Article · 11 July 2019 · Angewandte Chemie

DOI: https://doi.org/10.1002/ange.201905690 · OSTI ID:1566174

Gao, Liguo ^[1]; Zhang, Fei ^[2]; Chen, Xihan ^[2]; Xiao, Chuanxiao ^[3]; Larson, Bryon W. ^[2]; Dunfield, Sean P. ^[4]; Berry, Joseph J. ^[3];

^[2]

Chemistry and Nanoscience Center National Renewable Energy Laboratory Golden CO 80401 USA, Department of Chemistry Colorado School of Mines Golden CO USA
Chemistry and Nanoscience Center National Renewable Energy Laboratory Golden CO 80401 USA
Materials Science Center National Renewable Energy Laboratory Golden CO 80401 USA
Materials Science Center National Renewable Energy Laboratory Golden CO 80401 USA, Renewable and Sustainable Energy Institute University of Colorado Boulder CO 80309 USA, Materials Science and Engineering Program University of Colorado Boulder CO 80309 USA

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.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1566174

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 34 Vol. 131; ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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