Volume 131, Issue 34 pp. 11863-11867
Zuschrift

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

Dr. Liguo Gao

Dr. Liguo Gao

Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO, 80401 USA

Department of Chemistry, Colorado School of Mines, Golden, CO, USA

These authors contributed equally to this work.

Search for more papers by this author
Dr. Fei Zhang

Corresponding Author

Dr. Fei Zhang

Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO, 80401 USA

These authors contributed equally to this work.

Search for more papers by this author
Dr. Xihan Chen

Dr. Xihan Chen

Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO, 80401 USA

Search for more papers by this author
Dr. Chuanxiao Xiao

Dr. Chuanxiao Xiao

Materials Science Center, National Renewable Energy Laboratory, Golden, CO, 80401 USA

Search for more papers by this author
Dr. Bryon W. Larson

Dr. Bryon W. Larson

Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO, 80401 USA

Search for more papers by this author
Sean P. Dunfield

Sean P. Dunfield

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

Search for more papers by this author
Dr. Joseph J. Berry

Dr. Joseph J. Berry

Materials Science Center, National Renewable Energy Laboratory, Golden, CO, 80401 USA

Search for more papers by this author
Dr. Kai Zhu

Corresponding Author

Dr. Kai Zhu

Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO, 80401 USA

Search for more papers by this author
First published: 19 June 2019
Citations: 24

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.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.