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Enhancing Carrier Transport Properties of Melt-grown CsPbBr3 Single Crystals by Eliminating Inclusions
journal contribution
posted on 2020-03-17, 14:33 authored by Peng Zhang, Qihao Sun, Yadong Xu, Xiang Li, Lin Liu, Guodong Zhang, Xutang TaoAll-inorganic
perovskite CsPbBr3 has attracted intense
attentions due to its inspiring optoelectronic properties and excellent
stability. Growing large-size single crystals with high quality is
vital both for the intrinsic property investigation and the high-performance
device fabrication. Here, large-size CsPbBr3 single crystals
(ϕ 30 mm × 100 mm) were grown by the modified Bridgman
method. The surface morphologies of the as-grown CsPbBr3 single-crystal wafers were characterized by SEM, and inclusions
with size of 1–2 μm were observed in the first-time grown
crystal (labeled as CPB-1). By adopting a slower growth rate (0.2
mm/h) and cooling rate (5 °C/h) than that of CPB-1, the inclusions
were eliminated in subsequent growth (labeled as CPB-2). The hole
mobility-lifetime products were measured to be 3.92 × 10–3 and 1.46 × 10–2 cm2·V–1 for CPB-1 and CPB-2, respectively. The
carrier mobility of CPB-2 was enhanced 1 order of magnitude from 10.1
± 0.3 cm2·V–1·s–1 (CPB-1) to 101.3 ± 4.2 cm2·V–1·s–1 due to the elimination of inclusions.
In addition, CPB-2 exhibited excellent α particles detection
ability with the optimal energy resolution of 15.1% at −60
V bias. We provide an effective way to enhance the optoelectronic
properties and device performance of melt-grown CsPbBr3 single crystal by preventing the formation of the inclusions.