期刊
NANO LETTERS
卷 14, 期 1, 页码 127-133出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl403514x
关键词
Metal-organic perovskite; structure; pair distribution function; X-ray diffraction; disordered structures
类别
资金
- Center for Re-Defining Photovoltaic Efficiency Through Molecule Scale Control, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001085]
- U.S. Department of Energy, Division of Materials Sciences and Division of Chemical Sciences [DE-AC02-98CH10886]
We report the structure of methylammonium lead(II) iodide perovskite in mesoporous TiO2, as used in high-performance solar cells. Pair distribution function analysis of X-ray scattering reveals a two component nanostructure: one component with medium range crystalline order (30 atom %) and another with only local structural coherence (70 atom %). The nanostructuring correlates with a blueshift of the absorption onset and increases the photoluminescence. Our findings underscore the importance of fully characterizing and controlling the structure for improved solar cell efficiency.
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