Journal
ACS NANO
Volume 16, Issue 3, Pages 3985-3993Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c09513
Keywords
2D perovskites; tungsten disulfide; heterostructure photodetector; interfacial engineering; scanning photocurrent mapping
Categories
Funding
- National Natural Science Foundation of China [51602200, 61874074]
- (Key) Project of Department of Education of Guangdong Province [2016KZDXM008]
- Shenzhen Peacock Plan [KQTD2016053112042971]
- Technology and Innovation Commission of Shenzhen [20200810164814001]
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This study integrates two-dimensional perovskites with transition metal dichalcogenide monolayers to enhance photosensitivity and photoresponse. The vertically stacked heterostructure photodetector shows high detectivity and fast response time.
Two-dimensional (2D) transition metal dichalcogenide (TMDC) monolayers have been widely used for optoelectronic devices because of their ultrasensitivity to light detection acquired from their direct gap properties. However, the small cross-section of photon absorption in the atomically thin layer thickness significantly limits the generation of photocarriers, restricting their performance. Here, we integrate monolayer WS2 with 2D perovskites Cs2AgBiBr6, which serve as the light absorption layer, to greatly enhance the photosensitivity of WS2. The efficient charge transfer at the Cs2AgBiBr6/WS2 heterojunction is evidenced by the shortened photoluminescence (PL) decay time of Cs2AgBiBr6. Scanning photocurrent microscopy of Cs2AgBiBr6/WS2/graphene reveals that improved charge extraction from graphene leads to an enhanced photoresponse. The 2D Cs2AgBiBr6/WS2/graphene vertical heterostructure photodetector exhibits a high detectivity (D*) of 1.5 x 10(13) Jones with a fast response time of 52.3 mu s/53.6 mu s and an on/off ratio of 1.02 x 10(4). It is worth noting that this 2D heterostructure photodetector can realize self-powered light detection behavior with an open-circuit voltage of similar to 0.75 V. The results suggest that the 2D perovskites can effectively improve the TMDC layer-based photodetectors for low-power consumption photoelectrical applications.
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