Effect of Dimensionality on the Optical Absorption Properties of CsPbI$_3$ Perovskite Nanocrystals

J. Chem. Phys. 151, 191103 (2019) The band-gaps of CsPbI$_3$ perovskite nanocrystals are measured by absorption spectroscopy at cryogenic temperatures. Anomalous band-gap shifts are observed in CsPbI$_3$ nanocubes and nanoplatelets, which are modeled accurately by band-gap renormalization due to lat...

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Main Authors Liu, Albert, Bonato, Luiz G, Sessa, Francesco, Almeida, Diogo B, Isele, Erik, Nagamine, Gabriel, Zagonel, Luiz F, Nogueira, Ana F, Padilha, Lazaro A, Cundiff, Steven T
Format Journal Article
LanguageEnglish
Published 13.08.2019
Subjects
Physics - Applied Physics
Physics - Materials Science
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Summary:J. Chem. Phys. 151, 191103 (2019) The band-gaps of CsPbI$_3$ perovskite nanocrystals are measured by absorption spectroscopy at cryogenic temperatures. Anomalous band-gap shifts are observed in CsPbI$_3$ nanocubes and nanoplatelets, which are modeled accurately by band-gap renormalization due to lattice vibrational modes. We find that decreasing dimensionality of the CsPbI$_3$ lattice in nanoplatelets greatly reduces electron-phonon coupling, and dominant out-of-plane quantum confinement results in a homogeneously broadened absorption lineshape down to cryogenic temperatures. An absorption tail forms at low-temperatures in CsPbI$_3$ nanocubes, which we attribute to shallow defect states positioned near the valence band-edge.
DOI:10.48550/arxiv.1908.04881