title: Structure of methylammonium lead iodide within mesoporous titanium dioxide: active material in high-performance perovskite solar cells.
abstract: 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.
authors.affiliation: Department of Chemistry and ‡Department of Applied Physics and Applied Mathematics, Columbia University , New York, New York 10027, United States.
authors.forename: Joshua J
authors.initials: JJ
authors.lastname: Choi
authors.forename: Xiaohao
authors.initials: X
authors.lastname: Yang
authors.forename: Zachariah M
authors.initials: ZM
authors.lastname: Norman
authors.forename: Simon J L
authors.initials: SJ
authors.lastname: Billinge
authors.forename: Jonathan S
authors.initials: JS
authors.lastname: Owen