Critical Role of Methylammonium Librational Motion in Methylammonium Lead Iodide (CH3NH3PbI3) Perovskite Photochemistry

Myeongkee Park, Nikolay Kornienko, Sebastian E. Reyes-Lillo, Minliang Lai, Jeffrey B. Neaton, Peidong Yang, Richard A. Mathies

Resultado de la investigación: Contribución a una revistaArtículo

25 Citas (Scopus)

Resumen

Raman and photoluminescence (PL) spectroscopy are used to investigate dynamic structure-function relationships in methylammonium lead iodide (MAPbI3) perovskite. The intensity of the 150 cm-1 methylammonium (MA) librational Raman mode is found to be correlated with PL intensities in microstructures of MAPbI3. Because of the strong hydrogen bond between hydrogens in MA and iodine in the PbI6 perovskite octahedra, the Raman activity of MA is very sensitive to structural distortions of the inorganic framework. The structural distortions directly influence PL intensities, which in turn have been correlated with microstructure quality. Our measurements, supported with first-principles calculations, indicate how excited-state MA librational displacements mechanistically control PL efficiency and lifetime in MAPbI3 - material parameters that are likely important for efficient photovoltaic devices.

Idioma originalInglés
Páginas (desde-hasta)4151-4157
Número de páginas7
PublicaciónNano Letters
Volumen17
N.º7
DOI
EstadoPublicada - 12 jul 2017

Áreas temáticas de ASJC Scopus

  • Bioingeniería
  • Química (todo)
  • Ciencia de los materiales (todo)
  • Física de la materia condensada
  • Ingeniería mecánica

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