期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202110706
关键词
2D matereials; heterostructures; perovskite quantum dots; photodetectors; photoresponse
类别
资金
- National Natural Science Foundation of China [91750205, U1701661, 61935013, 61905147]
- Leading Talents Program of Guangdong Province [00201505, 2019JC01Y178]
- Natural Science Foundation of Guangdong Province [2016A030312010, 2020A1515010598, 2019TQ05x750]
- Shenzhen Science and Technology Innovation Commission [JCYJ20180507182035270, KQTD2017033011044403, KQTD20180412181324255]
- Pearl River Talent [2019JC01Y178]
- Peacock Team [KQTD20180412181324255]
A near-infrared photodetector based on MQDs and Ta2NiSe5 was fabricated, showing ultra-sensitive photoresponse, and the field-effect mobility and responsivity were enhanced by combining the two materials.
2D materials and their van der Waals heterostructures are of great fundamental interest and have potential applications in emerging electronics devices. However, atomically thin photodetector applications have suffered from performance limitations because of low optical absorption. Here, a near-infrared photodetector based on methylammonium lead halide perovskite quantum dots (MQDs), combined with Ta2NiSe5 van der Waals heterostructures, is fabricated to take advantage of their energy band alignment. An ultrasensitive photoresponse with a detectivity of 6.0 x 10(12) Jones for 800 nm illumination is demonstrated. Furthermore, the field-effect mobility and responsivity are enhanced by factors of 2 and 7.4, respectively, by interfacing Ta2NiSe5 and the MQDs. These results indicate that the optoelectrical properties of 2D ternary Ta2NiSe5 can be significantly optimized via hybridization with MQDs and can accelerate the evolution of MQD-van der Waals heterostructure-based devices.
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