Slow thermal equilibration in methylammonium lead iodide revealed by transient mid-infrared spectroscopy

Peijun Guo, Jue Gong, Sridhar Sadasivam, Yi Xia, Tze Bin Song, Benjamin T. Diroll, Constantinos C. Stoumpos, John B. Ketterson, Mercouri G Kanatzidis, Maria K.Y. Chan, Pierre Darancet, Tao Xu, Richard D Schaller

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Hybrid organic-inorganic perovskites are emerging semiconductors for cheap and efficient photovoltaics and light-emitting devices. Different from conventional inorganic semiconductors, hybrid perovskites consist of coexisting organic and inorganic sub-lattices, which present disparate atomic masses and bond strengths. The nanoscopic interpenetration of these disparate components, which lack strong electronic and vibrational coupling, presents fundamental challenges to the understanding of charge and heat dissipation. Here we study phonon population and equilibration processes in methylammonium lead iodide (MAPbI3) by transiently probing the vibrational modes of the organic sub-lattice following above-bandgap optical excitation. We observe inter-sub-lattice thermal equilibration on timescales ranging from hundreds of picoseconds to a couple of nanoseconds. As supported by a two-temperature model based on first-principles calculations, the slow thermal equilibration is attributable to the sequential phonon populations of the inorganic and organic sub-lattices, respectively. The observed long-lasting thermal non-equilibrium offers insights into thermal transport and heat management of the emergent hybrid material class.

Original languageEnglish
Article number2792
JournalNature Communications
Volume9
Issue number1
DOIs
Publication statusPublished - Dec 1 2018

Fingerprint

Iodides
iodides
Infrared spectroscopy
Spectrum Analysis
Hot Temperature
infrared spectroscopy
perovskites
Phonons
Semiconductors
atomic weights
Semiconductor materials
Photoexcitation
Hybrid materials
vibration mode
emerging
Heat losses
dissipation
cooling
heat
Population

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Slow thermal equilibration in methylammonium lead iodide revealed by transient mid-infrared spectroscopy. / Guo, Peijun; Gong, Jue; Sadasivam, Sridhar; Xia, Yi; Song, Tze Bin; Diroll, Benjamin T.; Stoumpos, Constantinos C.; Ketterson, John B.; Kanatzidis, Mercouri G; Chan, Maria K.Y.; Darancet, Pierre; Xu, Tao; Schaller, Richard D.

In: Nature Communications, Vol. 9, No. 1, 2792, 01.12.2018.

Research output: Contribution to journalArticle

Guo, P, Gong, J, Sadasivam, S, Xia, Y, Song, TB, Diroll, BT, Stoumpos, CC, Ketterson, JB, Kanatzidis, MG, Chan, MKY, Darancet, P, Xu, T & Schaller, RD 2018, 'Slow thermal equilibration in methylammonium lead iodide revealed by transient mid-infrared spectroscopy', Nature Communications, vol. 9, no. 1, 2792. https://doi.org/10.1038/s41467-018-05015-9
Guo, Peijun ; Gong, Jue ; Sadasivam, Sridhar ; Xia, Yi ; Song, Tze Bin ; Diroll, Benjamin T. ; Stoumpos, Constantinos C. ; Ketterson, John B. ; Kanatzidis, Mercouri G ; Chan, Maria K.Y. ; Darancet, Pierre ; Xu, Tao ; Schaller, Richard D. / Slow thermal equilibration in methylammonium lead iodide revealed by transient mid-infrared spectroscopy. In: Nature Communications. 2018 ; Vol. 9, No. 1.
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