Photocurrent spectra for above and below bandgap energies from photovoltaic PbS infrared detectors with graphene transparent electrodes

Title
Photocurrent spectra for above and below bandgap energies from photovoltaic PbS infrared detectors with graphene transparent electrodes
Authors
변지영최원준조소혜안학영Jungdong KimEmmanuel K. AmpaduEunsoon OhHongkyw Choi
Keywords
Lead sulfide; Photocurrent spectra; Infrared detectors; Photovoltaic; Multilayer graphene
Issue Date
2020-03
Publisher
Current applied physics
Citation
VOL 20-450
Abstract
We discussed photocurrent spectra of photovoltaic PbS infrared detectors using multi-layer graphene as transparent electrode, where p-PbS films were deposited on TiO2/FTO substrates by chemical bath deposition. In the photocurrent spectra, we observed both above-bandgap and sub-bandgap photocurrent without any external bias. We discussed impurity band model and grain boundary model in order to explain the sub-bandgap photocurrent near 15 μm. Since FTO is transparent in the visible range, we were able to illuminate green laser beam from the FTO back-side, and photo-response up to 50 μm was found to be enhanced. This long wavelength photo-response was attributed to the excitation of the photo-electrons accumulated at the TiO2/PbS interface. Our photovoltaic PbS devices can detect not only short-infrared but also terahertz radiation at room temperature, which is highly applicable to various fields.
URI
http://pubs.kist.re.kr/handle/201004/71020
ISSN
1567-1739
Appears in Collections:
KIST Publication > Article
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