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/anie.201905690

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

Journal Article · 19 June 2019 · Angewandte Chemie (International Edition)

DOI: https://doi.org/10.1002/anie.201905690 · OSTI ID:1529867

Gao, Liguo ^[1]; Zhang, Fei ^[2];

^[2]; Xiao, Chuanxiao ^[2]; Larson, Bryon W. ^[2]; Dunfield, Sean P. ^[3]; Berry, Joseph J. ^[2];

^[2]

National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)

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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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Hybrid Organic-Inorganic Semiconductors for Energy (CHOISE); National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Renewable Energy. Solar Energy Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1529867

Alternate ID(s):: OSTI ID: 1548759

Report Number(s):: NREL/JA-5900-73862

Journal Information:: Angewandte Chemie (International Edition), Vol. 58, Issue 34; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 74 works

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