title: Ultrathin Cu2O as an efficient inorganic hole transporting material for perovskite solar cells.
abstract: We demonstrate that ultrathin P-type Cu2O thin films fabricated by a facile thermal oxidation method can serve as a promising hole-transporting material in perovskite solar cells. Following a two-step method, inorganic-organic hybrid perovskite solar cells were fabricated and a power conversion efficiency of 11.0% was achieved. We found that the thickness and properties of Cu2O layers must be precisely tuned in order to achieve the optimal solar cell performance. The good performance of such perovskite solar cells can be attributed to the unique properties of ultrathin Cu2O, including high hole mobility, good energy level alignment with CH3NH3PbI3, and longer lifetime of photo-excited carriers. Combining the merits of low cost, facile synthesis, and high device performance, ultrathin Cu2O films fabricated via thermal oxidation hold promise for facilitating the developments of industrial-scale perovskite solar cells.
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Material Science and Engineering, Thuwal 23955-6900, Saudi Arabia. Tao.Wu@kaust.edu.sa and School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, P. R. China.
authors.forename: Weili
authors.initials: W
authors.lastname: Yu
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Material Science and Engineering, Thuwal 23955-6900, Saudi Arabia. Tao.Wu@kaust.edu.sa.
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Material Science and Engineering, Thuwal 23955-6900, Saudi Arabia. Tao.Wu@kaust.edu.sa.
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Solar and Photovoltaics Engineering Research Center, Thuwal 23955-6900, Saudi Arabia.
authors.forename: Erkki
authors.initials: E
authors.lastname: Alarousu
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Solar and Photovoltaics Engineering Research Center, Thuwal 23955-6900, Saudi Arabia and College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Chen
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Material Science and Engineering, Thuwal 23955-6900, Saudi Arabia. Tao.Wu@kaust.edu.sa.
authors.forename: Bin
authors.initials: B
authors.lastname: Lin
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Material Science and Engineering, Thuwal 23955-6900, Saudi Arabia. Tao.Wu@kaust.edu.sa.
authors.forename: Lingfei
authors.initials: L
authors.lastname: Wang
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Imaging and Characterization Core Lab, Thuwal 23955-6900, Saudi Arabia.
authors.forename: Mohamed Nejib
authors.initials: MN
authors.lastname: Hedhili
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Material Science and Engineering, Thuwal 23955-6900, Saudi Arabia. Tao.Wu@kaust.edu.sa.
authors.forename: Yangyang
authors.initials: Y
authors.lastname: Li
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Material Science and Engineering, Thuwal 23955-6900, Saudi Arabia. Tao.Wu@kaust.edu.sa.
authors.forename: Kewei
authors.initials: K
authors.lastname: Wu
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Nanofabrication Core Lab, Thuwal 23955-6900, Saudi Arabia.
authors.forename: Xianbin
authors.initials: X
authors.lastname: Wang
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Solar and Photovoltaics Engineering Research Center, Thuwal 23955-6900, Saudi Arabia.
authors.forename: Omar F
authors.initials: OF
authors.lastname: Mohammed
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Material Science and Engineering, Thuwal 23955-6900, Saudi Arabia. Tao.Wu@kaust.edu.sa.
authors.forename: Tom
authors.initials: T
authors.lastname: Wu