Quantum confinement effect of two-dimensional all-inorganic halide perovskites

Bo Cai, Xiaoming Li, Yu Gu, Moussab Harb, Jianhai Li, Meiqiu Xie, Fei Cao, Jizhong Song, Shengli Zhang, Luigi Cavallo, Haibo Zeng

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Quantum confinement effect (QCE), an essential physical phenomenon of semiconductors when the size becomes comparable to the exciton Bohr radius, typically results in quite different physical properties of low-dimensional materials from their bulk counterparts and can be exploited to enhance the device performance in various optoelectronic applications. Here, taking CsPbBr3 as an example, we reported QCE in all-inorganic halide perovskite in two-dimensional (2D) nanoplates. Blue shifts in optical absorption and photoluminescence spectra were found to be stronger in thinner nanoplates than that in thicker nanoplates, whose thickness lowered below ∼7 nm. The exciton binding energy results showed similar trend as that obtained for the optical absorption and photoluminescence. Meanwile, the function of integrated intensity and full width at half maximum and temperature also showed similar results, further supporting our conclusions. The results displayed the QCE in all-inorganic halide perovskite nanoplates and helped to design the all-inorganic halide perovskites with desired optical properties.
Original languageEnglish (US)
Pages (from-to)811-818
Number of pages8
JournalScience China Materials
Volume60
Issue number9
DOIs
StatePublished - Sep 5 2017

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