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Boosting Two-Dimensional MoS2/CsPbBr3 Photodetectors via Enhanced Light Absorbance and Interfacial Carrier Separation
journal contribution
posted on 2017-12-27, 00:00 authored by Xiufeng Song, Xuhai Liu, Dejian Yu, Chengxue Huo, Jianping Ji, Xiaoming Li, Shengli Zhang, Yousheng Zou, Gangyi Zhu, Yongjin Wang, Mingzai Wu, An Xie, Haibo ZengTransition metal
dichalcogenides (TMDs) are promising candidates for flexible optoelectronic
devices because of their special structures and excellent properties,
but the low optical absorption of the ultrathin layers greatly limits
the generation of photocarriers and restricts the performance. Here,
we integrate all-inorganic perovskite CsPbBr3 nanosheets
with MoS2 atomic layers and take the advantage of the large
absorption coefficient and high quantum efficiency of the perovskites,
to achieve excellent performance of the TMD-based photodetectors.
Significantly, the interfacial charge transfer from the CsPbBr3 to the MoS2 layer has been evidenced by the observed
photoluminescence quenching and shortened decay time of the hybrid
MoS2/CsPbBr3. Resultantly, such a hybrid MoS2/CsPbBr3 photodetector exhibits a high photoresponsivity
of 4.4 A/W, an external quantum efficiency of 302%, and a detectivity
of 2.5 × 1010 Jones because of the high efficient
photoexcited carrier separation at the interface of MoS2 and CsPbBr3. The photoresponsivity of this hybrid device
presents an improvement of 3 orders of magnitude compared with that
of a MoS2 device without CsPbBr3. The response
time of the device is also shortened from 65.2 to 0.72 ms after coupling
with MoS2 layers. The combination of the all-inorganic
perovskite layer with high photon absorption and the carrier transport
TMD layer may pave the way for novel high-performance optoelectronic
devices.
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Keywords
absorptioncarrier transport TMD layerMoS 2 deviceMoS 2all-inorganic perovskite layerquantum efficiencyphotoexcited carrier separationCsPbBr 3MoS 2 layerMoS 2 layersInterfacial Carrier Separation Transition metal dichalcogenidesEnhanced Light Absorbanceall-inorganic perovskite CsPbBr 3 nanosheetsoptoelectronic devices
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