title: Simultaneous band-gap narrowing and carrier-lifetime prolongation of organic-inorganic trihalide perovskites.
abstract: The organic-inorganic hybrid lead trihalide perovskites have been emerging as the most attractive photovoltaic materials. As regulated by Shockley-Queisser theory, a formidable materials science challenge for improvement to the next level requires further band-gap narrowing for broader absorption in solar spectrum, while retaining or even synergistically prolonging the carrier lifetime, a critical factor responsible for attaining the near-band-gap photovoltage. Herein, by applying controllable hydrostatic pressure, we have achieved unprecedented simultaneous enhancement in both band-gap narrowing and carrier-lifetime prolongation (up to 70% to ∼100% increase) under mild pressures at ∼0.3 GPa. The pressure-induced modulation on pure hybrid perovskites without introducing any adverse chemical or thermal effect clearly demonstrates the importance of band edges on the photon-electron interaction and maps a pioneering route toward a further increase in their photovoltaic performance.
authors.affiliation: Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China; Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015;
authors.forename: Lingping
authors.initials: L
authors.lastname: Kong
authors.affiliation: Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China; Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015; liugang@hpstar.ac.cn txu@niu.edu hmao@carnegiescience.edu.
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.affiliation: Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115;
authors.forename: Jue
authors.initials: J
authors.lastname: Gong
authors.affiliation: Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China; Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015;
authors.forename: Qingyang
authors.initials: Q
authors.lastname: Hu
authors.affiliation: Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439;
authors.forename: Richard D
authors.initials: RD
authors.lastname: Schaller
authors.affiliation: Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, HI 96822;
authors.forename: Przemyslaw
authors.initials: P
authors.lastname: Dera
authors.affiliation: Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, HI 96822;
authors.forename: Dongzhou
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015;
authors.forename: Zhenxian
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China; Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015;
authors.forename: Wenge
authors.initials: W
authors.lastname: Yang
authors.affiliation: Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO 80401;
authors.forename: Kai
authors.initials: K
authors.lastname: Zhu
authors.affiliation: National Center for Protein Science Shanghai, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201210, China;
authors.forename: Yuzhao
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China;
authors.forename: Chuanyi
authors.initials: C
authors.lastname: Wang
authors.affiliation: Beijing Computational Science Research Center, Beijing 100193, China.
authors.forename: Su-Huai
authors.initials: SH
authors.lastname: Wei
authors.affiliation: Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115; liugang@hpstar.ac.cn txu@niu.edu hmao@carnegiescience.edu.
authors.forename: Tao
authors.initials: T
authors.lastname: Xu
authors.affiliation: Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China; Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015; liugang@hpstar.ac.cn txu@niu.edu hmao@carnegiescience.edu.
authors.forename: Ho-Kwang
authors.initials: HK
authors.lastname: Mao
keywords: band gap; carrier lifetime; high pressure; perovskite; solar cell