Abstract
In this study, the inverse temperature crystallization method was used to produce bulk crystal CH3NH3PbBr3 (MAPbBr3) perovskite, and repeated crystallization processes were carried out to obtain a larger crystal size and develop a bulk material for application in semiconductor devices. The material and optoelectronic properties of the MAPbBr3 perovskite crystals after the repeated processes were characterized. The X-ray diffraction (XRD) patterns of all samples demonstrated a pure perovskite phase. One strong diffraction peak located at 29.4°, which corresponds to the (200) perovskite plane, was observed after the first growth cycle. The mobilities for the samples after the first, second, and third growth cycles were calculated and resulted to be 0.9, 5.6, and 54.7 cm2/Vs, respectively, according to Mott–Gurney law. A higher mobility after the multiple crystallization processes indicated that the surface states caused by voids in the crystals favored electron transition in the perovskite material.
Highlights
Organic perovskites MAPbX3 have drawn much interest because of their simple and low-temperature solution processes
Many studies have widely investigated these compounds for solar cells [4,5,6,7,8,9,10,11,12], light-emitting diodes [13], photodetectors [14], light converters [15], lasing [16], and hydrogen production [17]
It is well known that single crystals exhibit just a single grain where no boundary appears, and polycrystals consist of several grains where a boundary exists between the grains
Summary
Many studies have widely investigated these compounds for solar cells [4,5,6,7,8,9,10,11,12], light-emitting diodes [13], photodetectors [14], light converters [15], lasing [16], and hydrogen production [17] These devices were based on polycrystal perovskite films. The size of MAPbBr3 bulk crystals is around 3–5 mm for several hours during a one-cycle growth [18,19,20] In order to obtain larger bulk crystals, a repeated process method was used. This method, and their material and electronic properties were analyzed and discussed
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