High-Performance
Planar-Type Ultraviolet
Photodetector Based on High-Quality CH3NH3PbCl3 Perovskite Single Crystals
Posted on 2019-09-09 - 11:03
A hybrid
perovskite MAPbCl3 (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 MAPbCl3 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 MAPbCl3 single crystals, namely, lower temperature
nucleation and higher temperature crystallization. These MAPbCl3 single crystals present low defect density (∼7.9 ×
109 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 MAPbCl3 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), ∼2–3 orders of magnitude higher than that of the
previously reported MAPbCl3 photodetectors. Meanwhile,
the device has an ultrafast response speed with a rise time of 130
ns, which is one of the shortest values of MAPbX3-based
photodetectors. Our findings open a new way to obtain high-quality
perovskite single crystals and their high-performance photodetectors.
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Cheng, Zhen; Liu, Kewei; Yang, Jialin; Chen, Xing; Xie, Xiuhua; Li, Binghui; et al. (2019). High-Performance
Planar-Type Ultraviolet
Photodetector Based on High-Quality CH3NH3PbCl3 Perovskite Single Crystals. ACS Publications. Collection. https://doi.org/10.1021/acsami.9b09035
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AUTHORS (10)
ZC
Zhen Cheng
KL
Kewei Liu
JY
Jialin Yang
XC
Xing Chen
XX
Xiuhua Xie
BL
Binghui Li
ZZ
Zhenzhong Zhang
LL
Lei Liu
CS
Chongxin Shan
DS
Dezhen Shen