Journal
COMPOSITES COMMUNICATIONS
Volume 32, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.coco.2022.101175
Keywords
Te/Se heterojunction nanocomposites; PEC-type photodetector; Self-powered; Broadband
Categories
Funding
- National Natural Science Foundation of China [52103093, 52173078]
- State Key Program of National Natural Science Foundation of China [52130303]
- China Postdoctoral Science Foundation [2021M702424]
- Young Elite Scientists Sponsorship Program by the China Association for Science and Technology [2021QNRC001]
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In this work, Te/Se heterostructure nanocomposites were synthesized and used as a photosensitive material for photoelectrochemical-type photodetectors. The Te/Se-based photodetectors demonstrated excellent photodetection performance, broad optical response spectrum, and cycle stability.
Van der Waals (vdW) heterojunctions formed from different nanomaterials not only have the characteristics of each material but also exhibit novel physical properties due to the combination of them. In this work, we report on the facile synthesis of Te/Se heterostructure nanocomposites, and their application as a photosensitive material for photoelectrochemical (PEC)-type photodetectors. The Te/Se-based PEC-type photodetectors are found to achieve excellent photodetection performance and have a broad optical response spectrum that covers the ultraviolet (365 nm) to near-infrared (980 nm) regions. With 1.0 M KOH as the electrolyte, the Te/Se-based PECtype photodetectors exhibit a photoresponsivity of 4.04 mu A W-1, a specific detectivity of 1.6 x 10(7) Jones, and a fast response time of less than 0.2 s under 365 nm illumination at 0 V, indicating excellent self-powered capability. Additionally, under an applied bias potential of 0.6 V, the photodetectors exhibit a high photoresponsivity of up to 83.19 mu A W-1 and a specific detectivity of 3.3 x 10(8) Jones. Moreover, the Te/Se-based PEC-type photodetectors show good cycle stability after loop running for 1500 s.
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