Structure of Methylammonium Lead Iodide Within Mesoporous Titanium Dioxide: Active Material in High-Performance Perovskite Solar Cells

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 w...

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Veröffentlicht in:	NANO LETTERS 2014-01, Vol.14 (1), p.127-133
Hauptverfasser:	Choi, Joshua J, Yang, Xiaohao, Norman, Zachariah M, Billinge, Simon J. L, Owen, Jonathan S
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Atomic structure CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Crystal structure Energy Exact sciences and technology Iodides Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties Nanostructure Natural energy Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures Perovskites Photovoltaic cells Photovoltaic conversion Physics Solar cells Solar cells. Photoelectrochemical cells Solar energy Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) Titanium dioxide
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Zusammenfassung:	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.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl403514x