title: Working Mechanism for Flexible Perovskite Solar Cells with Simplified Architecture.
abstract: In this communication, we report an efficient and flexible perovskite solar cell based on formamidinium lead trihalide (FAPbI3) with simplified configuration. The device achieved a champion efficiency of 12.70%, utilizing direct contact between metallic indium tin oxide (ITO) electrode and perovskite absorber. The underlying working mechanism is proposed subsequently, via a systematic investigation focusing on the heterojunction within this device. A significant charge storage has been observed in the perovskite, which is believed to generate photovoltage and serves as the driving force for charge transferring from the absorber to ITO electrode as well. More importantly, this simplified device structure on flexible substrates suggests its compatibility for scale-up fabrication, which paves the way for commercialization of perovskite photovoltaic technology.
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.|Wuhan National Laboratory for Optoelectronics, School of Optical, Electronic Information, Huazhong University of Science, Technology , Wuhan, Hubei 430074, People's Republic of China.
authors.forename: Xiaobao
authors.initials: X
authors.lastname: Xu
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Ziruo
authors.initials: Z
authors.lastname: Hong
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Huanping
authors.initials: H
authors.lastname: Zhou
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.|Wuhan National Laboratory for Optoelectronics, School of Optical, Electronic Information, Huazhong University of Science, Technology , Wuhan, Hubei 430074, People's Republic of China.
authors.forename: Zonghao
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Wei-Hsuan
authors.initials: WH
authors.lastname: Chang
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Pengyu
authors.initials: P
authors.lastname: Sun
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Huajun
authors.initials: H
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Nicholas
authors.initials: N
authors.lastname: De Marco
authors.affiliation: Wuhan National Laboratory for Optoelectronics, School of Optical, Electronic Information, Huazhong University of Science, Technology , Wuhan, Hubei 430074, People's Republic of China.
authors.forename: Mingkui
authors.initials: M
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
keywords: Perovskite; built-in potential; heterojunction; solar cell; working mechanism