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Proc Natl Acad Sci U S A. 2016 Aug 9;113(32):8910-5. doi: 10.1073/pnas.1609030113. Epub 2016 Jul 21.

Simultaneous band-gap narrowing and carrier-lifetime prolongation of organic-inorganic trihalide perovskites.

Author information

1
Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China; Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015;
2
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.
3
Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115;
4
Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439;
5
Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, HI 96822;
6
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015;
7
Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO 80401;
8
National Center for Protein Science Shanghai, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201210, China;
9
Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China;
10
Beijing Computational Science Research Center, Beijing 100193, China.
11
Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115; liugang@hpstar.ac.cn txu@niu.edu hmao@carnegiescience.edu.

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.

KEYWORDS:

band gap; carrier lifetime; high pressure; perovskite; solar cell

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