Electronic and Ionic Transport Dynamics in Organolead Halide Perovskites.
Ion migration has been postulated as the underlying mechanism responsible for the hysteresis in organolead halide perovskite devices. However, the electronic and ionic transport dynamics and how they impact each other in organolead halide perovskites remain elusive to date. Here we report a systematic investigation of the electronic and ionic transport dynamics in organolead halide perovskite microplate crystals and thin films using temperature-dependent transient response measurements. Our study reveals that thermally activated ionic and electronic conduction coexist in perovskite devices. The extracted activation energies suggest that the electronic transport is easier, but ions migrate harder in microplates than in thin films, demonstrating that the crystalline quality and grain boundaries can fundamentally modify electronic and ionic transport in perovskites. These findings offer valuable insight on the electronic and ionic transport dynamics in organolead halide perovskites, which is critical for optimizing perovskite devices with reduced hysteresis and improved stability and efficiency.
Department of Chemistry and Biochemistry, ‡Department of Materials Science and Engineering, and §California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
Dehui
D
Li
Department of Chemistry and Biochemistry, ‡Department of Materials Science and Engineering, and §California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
Hao
H
Wu
Department of Chemistry and Biochemistry, ‡Department of Materials Science and Engineering, and §California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
Hung-Chieh
HC
Cheng
Department of Chemistry and Biochemistry, ‡Department of Materials Science and Engineering, and §California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
Gongming
G
Wang
Department of Chemistry and Biochemistry, ‡Department of Materials Science and Engineering, and §California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
Yu
Y
Huang
Department of Chemistry and Biochemistry, ‡Department of Materials Science and Engineering, and §California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
Xiangfeng
X
Duan
activation energy; electronic transport; hysteresis; ionic transport; organolead halide perovskite