Enhanced Charge Transport by Incorporating Formamidinium and Cesium Cations into Two‐Dimensional Perovskite Solar Cells
- 19 June 2019
- journal article
- research article
- Published by Wiley in Angewandte Chemie
- Vol. 58 (34), 11737-11741
- https://doi.org/10.1002/anie.201905690
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.Funding Information
- U.S. Department of Energy (DE-AC36-08GO28308)
This publication has 44 references indexed in Scilit:
- Functionalization of perovskite thin films with moisture-tolerant moleculesNature Energy, 2016
- A mixed-cation lead mixed-halide perovskite absorber for tandem solar cellsScience, 2016
- Entropic stabilization of mixed A-cation ABX3 metal halide perovskites for high performance perovskite solar cellsEnergy & Environmental Science, 2015
- Controllable Grain Morphology of Perovskite Absorber Film by Molecular Self-Assembly toward Efficient Solar Cell Exceeding 17%Journal of the American Chemical Society, 2015
- High efficiency stable inverted perovskite solar cells without current hysteresisEnergy & Environmental Science, 2015
- A Layered Hybrid Perovskite Solar‐Cell Absorber with Enhanced Moisture StabilityAngewandte Chemie, 2014
- A Layered Hybrid Perovskite Solar‐Cell Absorber with Enhanced Moisture StabilityAngewandte Chemie, 2014
- Cation-Induced Band-Gap Tuning in Organohalide Perovskites: Interplay of Spin–Orbit Coupling and Octahedra TiltingNano Letters, 2014
- Perovskite-Based Solar CellsScience, 2013
- Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic CellsJournal of the American Chemical Society, 2009