Quantum confinement effect of two-dimensional all-inorganic halide perovskites
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AbstractQuantum 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.
CitationCai B, Li X, Gu Y, Harb M, Li J, et al. (2017) Quantum confinement effect of two-dimensional all-inorganic halide perovskites. Science China Materials 60: 811–818. Available: http://dx.doi.org/10.1007/s40843-017-9090-0.
SponsorsThis work was supported by the National Basic Research Program of China (2014CB931702), the National Key Research and Development Program of China (2016YFB0401701), the National Natural Science Foundation of China (NSFC 51572128 and 21403109), NSFC-RGC (5151101197), the Natural Science Foundation of Jiangsu Province (BK20160827), China Postdoctoral Science Foundation (2016M590455), the Fundamental Research Funds for the Central Universities (30915012205 and 30916015106), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
JournalScience China Materials