期刊
SURFACES AND INTERFACES
卷 30, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.surfin.2022.101813
关键词
MoS2; AZO; Transparent electrodes; Broadband photodetector
类别
资金
- Department of Atomic Energy (DAE) [34/20/09/2015/BRNS]
- Department of Science and Technology (DST), India
In this study, a low-cost and transparent Al-doped ZnO (AZO) electrode was developed for self-powered and highly responsive photodetectors from visible to near-infrared regions. The AZO-MoS2 photodetector demonstrated superior performance compared to traditional metal electrodes.
The transparent Ohmic electrodes are the extreme necessity to develop cutting-edge broadband photodetectors. Conventional metal electrodes reflect incident light and diminish overall performance of photodetector. Here, we report cost-effective, transparent Ohmic Al-doped ZnO (AZO) electrodes to develop self-powered, highly responsive photodetectors from visible to near-infrared regions using vertically-aligned MoS2 (VA-MoS2) flakes. The MoS2 photodetector with AZO electrode (AZO-MoS2) shows a high responsivity of 40.67 A/W at 800 nm at low biasing voltage of 0.5 V. The self-driven behavior is observed in a broad range from 400 to 1100 nm with high responsivity of 38.18 mA/W at 800 nm. Moreover, AZO-MoS2 device has fast rise and decay time. To understand impact of Ohmic AZO electrode in comparison to traditional metal electrodes, we have also investigated conventional Au-MoS2 PDs fabricated under identical dimensions. The AZO-MoS2 PD demonstrated 100 times higher responsivity than conventional Au-MoS2 PD at 800 nm. We have investigated band-alignment between AZO and MoS2 using ultraviolet spectroscopy (UPS) and confirmed ohmic nature between the AZO and MoS2. These results indicate superior performance of AZO-MoS2 PD device in comparison to traditional metal electrodes.
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