Structural Phase- and Degradation-Dependent Thermal Conductivity of CH3NH3PbI3 Perovskite Thin Films

Zhi Guo, Seog Joon Yoon, Joseph S. Manser, Prashant V. Kamat, Tengfei Luo

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Organic-inorganic lead halide perovskites have shown great promise in photovoltaics and optoelectronics. In these applications, device performance and reliability can be strongly influenced by thermal transport in the materials. Through laser pump-probe experiments, different microstructures of CH3NH3PbI3 perovskite thin films are found to give rise to different phonon scattering mechanism. The thermal conductivity in CH3NH3PbI3 neat film decreases with temperature. Even though this agrees with the behavior of its bulk crystalline counterparts, an apparent thermal conductivity change near the structural phase transition temperature of this perovskite (orthorhombic vs tetragonal) has only been observed in the spin-coated films. Analyses suggest that this may be attributed to either an energy landscape change related to organic cation disorder or the thickness change of ferroelectric domain walls formed in the neat perovskite films that affects the phonon scattering at the domain boundaries. In contrast, no thermal conductivity discontinuity has been observed in the CH3NH3PbI3/Al2O3 mesostructured films, where the thermal conductivity first shows an increasing trend at low temperature (
Original languageEnglish (US)
Pages (from-to)6394-6401
Number of pages8
JournalJOURNAL OF PHYSICAL CHEMISTRY C
Volume120
Issue number12
DOIs
StatePublished - Mar 16 2016
Externally publishedYes

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials

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