Dynamic Disorder, Band Gap Widening, and Persistent Near-IR Photoluminescence up to at Least 523 K in ASnI3 Perovskites (A = Cs+, CH3NH3 + and NH2-CHNH2 +)

Athanassios G. Kontos, Andreas Kaltzoglou, Michalis K. Arfanis, Kyle M. McCall, Constantinos C. Stoumpos, Bruce W. Wessels, Polycarpos Falaras, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

Abstract

We report temperature-dependent photoluminescence (PL) in polycrystalline ASnI3 perovskites (A = Cs+, CH3NH3 +, and HC(NH2)2 +), demonstrating extremely robust emission up to very high temperatures (523 K for CsSnI3). The PL peak energy (EPL) monotonically blueshifts with increasing temperature, indicating band gap widening. Variable temperature synchrotron powder X-ray diffraction analysis confirms that these changes are associated with progressive emphanitic off-centering and dynamic fluctuations of the perovskite lattice. In CsSnI3, three different temperature gradients of EPL are defined (0.29 meV K-1 below 200 K, 0.17 meV K-1 from 200 to 400 K, and 0.48 meV K-1 above 400 K), commensurate with the onset of dynamic structural disorder at 200 K and its saturation at 400 K as the Cs+ atoms rattle independently of the [SnI3]- perovskite lattice. These results explain how solution-processed perovskites with massive defect concentrations can yield high optoelectronic performance at elevated temperatures.

Original languageEnglish
Pages (from-to)26353-26361
Number of pages9
JournalJournal of Physical Chemistry C
Volume122
Issue number46
DOIs
Publication statusPublished - Nov 21 2018

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perovskites
Photoluminescence
Energy gap
disorders
photoluminescence
Perovskite
Temperature
temperature
dynamic structural analysis
Structural dynamics
temperature gradients
synchrotrons
Synchrotrons
Optoelectronic devices
Thermal gradients
X ray diffraction analysis
saturation
defects
Powders
Atoms

ASJC Scopus subject areas

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

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Dynamic Disorder, Band Gap Widening, and Persistent Near-IR Photoluminescence up to at Least 523 K in ASnI3 Perovskites (A = Cs+, CH3NH3 + and NH2-CHNH2 +). / Kontos, Athanassios G.; Kaltzoglou, Andreas; Arfanis, Michalis K.; McCall, Kyle M.; Stoumpos, Constantinos C.; Wessels, Bruce W.; Falaras, Polycarpos; Kanatzidis, Mercouri G.

In: Journal of Physical Chemistry C, Vol. 122, No. 46, 21.11.2018, p. 26353-26361.

Research output: Contribution to journalArticle

Kontos, Athanassios G. ; Kaltzoglou, Andreas ; Arfanis, Michalis K. ; McCall, Kyle M. ; Stoumpos, Constantinos C. ; Wessels, Bruce W. ; Falaras, Polycarpos ; Kanatzidis, Mercouri G. / Dynamic Disorder, Band Gap Widening, and Persistent Near-IR Photoluminescence up to at Least 523 K in ASnI3 Perovskites (A = Cs+, CH3NH3 + and NH2-CHNH2 +). In: Journal of Physical Chemistry C. 2018 ; Vol. 122, No. 46. pp. 26353-26361.
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AU - Kaltzoglou, Andreas

AU - Arfanis, Michalis K.

AU - McCall, Kyle M.

AU - Stoumpos, Constantinos C.

AU - Wessels, Bruce W.

AU - Falaras, Polycarpos

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