Electronic properties of individual CsPbI2Br nanocrystals investigated by LT-STM

Solution-processed metal halide perovskite nanocrystals show promise for various potential optoelectronic applications and the exploration of the fundamental physics underlying them. However, the electronic properties of individual nanocrystals have not been thoroughly studied. Here, we applied low-...

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Bibliographic Details
Published inFunctional materials letters Vol. 17; no. 4
Main Authors Li, Jianmin, Zhao, Han, Ma, Kang, Fu, Yikai, Dai, Haitao, Sun, Zhixiang, Gao, Hong-Ying
Format Journal Article
LanguageEnglish
Published Singapore World Scientific Publishing Company 01.05.2024
World Scientific Publishing Co. Pte., Ltd
Subjects
Electronic properties
Electronic structure
Energy gap
Excitation spectra
Excitons
Gold
Ion migration
Low temperature
Metal halides
Microscopy
Nanocrystals
Optoelectronics
Perovskites
Pyrolytic graphite
Scanning tunneling microscopy
Substrates
Thin films
Metal halide perovskite nanocrystals
scanning tunneling microscopy
electronic structure
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Summary:Solution-processed metal halide perovskite nanocrystals show promise for various potential optoelectronic applications and the exploration of the fundamental physics underlying them. However, the electronic properties of individual nanocrystals have not been thoroughly studied. Here, we applied low-temperature scanning tunneling microscopy to investigate the properties of metal halide perovskite CsPbI2Br nanocrystals with a diameter in the range of 10–20 nm. Sub-monolayer dispersions of the nanocrystal on highly oriented pyrolytic graphite and gold thin film substrates were achieved. Using scanning tunneling microscopy, we resolved topographies of individual nanocrystals on the gold film, and their electronic properties were probed by scanning tunneling spectroscopy. In our experiment, no obvious dependence of the extracted energy gap on the nanocrystal size and shape was found, which is consistent with the reported small exciton Bohr radius in metal halide perovskite materials. Additionally, we observed that the energy gaps of some nanocrystals are smaller than that of the bulk, suggesting the influence of factors such as deep-level defects/traps, ion migration, etc. on the electronic structure.
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ISSN:1793-6047
1793-7213
DOI:10.1142/S1793604724500103