Strong Electron–Phonon Coupling and Self-Trapped Excitons in the Defect Halide Perovskites A 3 M 2 I 9  (A = Cs, Rb; M = Bi, Sb)

McCall, Kyle M.; Stoumpos, Constantinos C.; Kostina, Svetlana S.; Kanatzidis, Mercouri G.; Wessels, Bruce W.

doi:10.1021/acs.chemmater.7b01184

articleChemistry of MaterialsApr 26, 2017GREEN OA

Strong Electron–Phonon Coupling and Self-Trapped Excitons in the Defect Halide Perovskites A 3 M 2 I 9 (A = Cs, Rb; M = Bi, Sb)

KMKyle M. McCall CCConstantinos C. Stoumpos SSSvetlana S. Kostina MGMercouri G. Kanatzidis BWBruce W. Wessels

Northwestern University

Indexed incrossref

Abstract

The optical and electronic properties of Bridgman grown single crystals of the wide-bandgap semiconducting defect halide perovskites A3M2I9 (A = Cs, Rb; M = Bi, Sb) have been investigated. Intense Raman scattering was observed at room temperature for each compound, indicating high polarizability and strong electron–phonon coupling. Both low-temperature and room-temperature photoluminescence (PL) were measured for each compound. Cs3Sb2I9 and Rb3Sb2I9 have broad PL emission bands between 1.75 and 2.05 eV with peaks at 1.96 and 1.92 eV, respectively. The Cs3Bi2I9 PL spectra showed broad emission consisting of several overlapping bands in the 1.65–2.2 eV range. Evidence of strong electron–phonon coupling…

Citation impact

702

total citations

FWCI: 30.25
Percentile: 100%
References: 102

Citations per year

Authors

5

Topics & keywords

Topics

Keywords

Exciton
Photoluminescence
Phonon
Raman spectroscopy
Raman scattering
Polarizability
Materials science
Halide

No related works found for this paper.