Journal
ADVANCED MATERIALS INTERFACES
Volume 8, Issue 7, Pages -Publisher
WILEY
DOI: 10.1002/admi.202002231
Keywords
CsPbBr3 quantum dots; photodetectors; Si; UV-vis-NIR detection; V-MoS2
Funding
- National Natural Science Foundation of China [62005072, 51972094, 11704094]
- Nature Science Foundation of Hebei Province [E2020201025, F2019201047, F2018201198]
- Advanced Talents Incubation Program of the Hebei University [521000981287, 521000981351, 521000981248]
- Hebei Province high-level talents Funding project [A201801003]
- Undergraduate Innovation and Entrepreneurship Training Program of the Hebei University [2020216]
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This study successfully prepared a CsPbBr3 quantum dots-modified vertically layered MoS2/Si heterojunction photodetector, demonstrating excellent performance in UV-vis-NIR broad-spectrum detection, particularly in terms of response speed and responsivity at 808 nm. The modification of CsPbBr3 QDs significantly enhanced the responsivities of the V-MoS2/Si-based photodetector at 532 nm, 671 nm, and 808 nm wavelengths.
The CsPbBr3 quantum dots (QDs) modified vertically layered MoS2/Si (V-MoS2/Si) heterojunction is successfully prepared. It is found that the resulting photodetector realizes the UV-vis-NIR broad-spectrum detection with good sensitivity and fast photoresponse speed. Typically, the responsivity and response/recovery time towards 808 nm reach up to 0.975 A W-1 and 6.8/6.7 ms, respectively. Furthermore, it is demonstrated that with the modification of CsPbBr3 QDs, the responsivities of the pure V-MoS2/Si-based photodetector for 532, 671, and 808 nm detection are boosted by 5.43, 2, and 5.45 times, respectively. The enhanced sensing performance is attributed to the vis-NIR light harvesting capability and excellent electrical transporting property of the CsPbBr3 QDs. Most importantly, the flexibility can be applied to the wearable devices for various working environments. The present work pushes the development of the flexible devices for broadband spectrum detection faced to practical application.
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