title: Gate-Induced Insulator to Band-Like Transport Transition in Organolead Halide Perovskite.
abstract: Understanding the intrinsic charge transport in organolead halide perovskites is essential for the development of high-efficiency photovoltaics and other optoelectronic devices. Despite the rapid advancement of the organolead halide perovskite in photovoltaic and optoelectronic applications, the intrinsic charge-carrier transport in these materials remains elusive partly due to the difficulty of fabricating electrical devices and obtaining good electrical contact. Here we report the fabrication of organolead halide perovskite microplates with mono- or bilayer graphene as low barrier electrical contact. Systematic charge-transport studies reveal an insulator to band-like transport transition. Our studies indicate that the insulator to band-like transport transition depends on the orthorhombic-to-tetragonal phase-transition temperature and defect densities of the organolead halide perovskite microplates. Our findings not only are important for the fundamental understanding of charge-transport behavior but also offer valuable practical implications for photovoltaics and optoelectronic applications based on the organolead halide perovskite.
authors.affiliation: Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095, United States.|School of Optical and Electronic Information, Huazhong University of Science and Technology , Wuhan 430074, China.
authors.forename: Dehui
authors.identifier: http://orcid.org/0000-0002-5945-220X
authors.initials: D
authors.lastname: Li
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Hung-Chieh
authors.initials: HC
authors.lastname: Cheng
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Hao
authors.initials: H
authors.lastname: Wu
authors.affiliation: Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095, United States.
authors.forename: Yiliu
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Jian
authors.initials: J
authors.lastname: Guo
authors.affiliation: Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095, United States.|California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
authors.forename: Gongming
authors.initials: G
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.|California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
authors.forename: Yu
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095, United States.|California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
authors.forename: Xiangfeng
authors.identifier: http://orcid.org/0000-0002-4321-6288
authors.initials: X
authors.lastname: Duan