期刊
ACS PHOTONICS
卷 7, 期 5, 页码 1117-1121出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c00247
关键词
colloidal quantum dots; graphene/silicon Schottky junction; visible/infrared; dual-channel photodetectors
类别
资金
- ARO [W911NF-18-1-0207]
- University of Chicago Materials Research Science and Engineering Center - National Science Foundation [DMR1420709]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource of the National Science Foundation's National Nanotechnology Coordinated Infrastructure [NSF ECCS-1542205]
Integration of infrared detectors with current silicon-based imagers would not only extend their spectral sensing range, but also enables numerous applications including thermal imaging, machine vision, and spectrometers. Here, we report the development of a dual-channel photodetector by depositing a colloidal quantum dot (CQDs) infrared photodiode onto a graphene/p-silicon Schottky junction to provide simultaneous visible and infrared photoresponse channels. The HgTe photodiode is patterned into a semitransparent mesh structure with varying fill factors so that the visible light reaches the silicon substrate. The graphene/silicon Schottky junction has a responsivity of similar to 0.9 A/W in the visible and the infrared CQDs photodiode has a detectivity of similar to 5 x 10(9) Jones at 2.4 mu m for a filling factor of 0.1.
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