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

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2]; ORCiD logo [2];  [2];  [2];  [3];  [2]; ORCiD logo [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. 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.

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), Renewable Power Office. Solar Energy Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES)
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
Citation Metrics:
Cited by: 74 works
Citation information provided by
Web of Science

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Cited By (5)

Grain Boundary Enhanced Photoluminescence Anisotropy in Two‐Dimensional Hybrid Perovskite Films journal February 2020
Ruddlesden–Popper Perovskites: Synthesis and Optical Properties for Optoelectronic Applications journal October 2019
Additive Engineering for Efficient and Stable Perovskite Solar Cells journal October 2019
Emerging Conductive Atomic Force Microscopy for Metal Halide Perovskite Materials and Solar Cells journal March 2020
Chirality control in white-light emitting 2D perovskites journal January 2020

Figures / Tables (4)