期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 37, 页码 34144-34150出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b09035
关键词
CH3NH3PbCl3; perovskite; photodetectors; single crystals; high speed
资金
- National Natural Science Foundation of China [61475153, 61605200, 61875194, 11727902, 61425021, 61525404]
- Jilin Province Young and Middle-aged Science and Technology Innovation Leaders and Team Project [20180519023JH]
- 100 Talents Program of the Chinese Academy of Sciences
- Jilin Province Science Fund for Excellent Young Scholars [20180520173JH]
A hybrid perovskite MAPbCl(3) (MA = CH3NH3+) single crystal is considered to be one of the most viable candidates for the development of photodetectors because of its outstanding optoelectronic properties. However, the relatively lower crystalline quality of the reported MAPbCl(3) single crystals fabricated by the traditional one-step inverse temperature crystallization results in momentous degradation in the performance of their photodetectors. Here, we present a novel two-step temperature process to fabricate high-quality MAPbCl(3) single crystals, namely, lower temperature nucleation and higher temperature crystallization. These MAPbCl(3) single crystals present low defect density (similar to 7.9 x 10(9) cm(-3)) commensurate with the best-quality crystals of hybrid organic-inorganic lead halide perovskites reported so far. Moreover, a high-performance ultraviolet photodetector was demonstrated on MAPbCl(3) single crystals. At 30 V, the peak responsivity at 415 nm of the photodetector is as high as 3.73 A W-1 (light intensity = 1 mW cm(-2)), similar to 2-3 orders of magnitude higher than that of the previously reported MAPbCl(3) photodetectors. Meanwhile, the device has an ultrafast response speed with a rise time of 130 ns, which is one of the shortest values of MAPbX(3)-based photodetectors. Our findings open a new way to obtain high-quality perovskite single crystals and their high-performance photodetectors.
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