Journal
IEEE SENSORS JOURNAL
Volume 21, Issue 13, Pages 14784-14788Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2021.3074380
Keywords
Silicon; Heterojunctions; Junctions; Heterojunction bipolar transistors; Sulfur; Resists; Voltage measurement; Heterojunctions; photodetectors; MoS2; Si; phototransistor
Funding
- Tarbiat Modares University [IG-39703]
- Iran National Science Foundation
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This study describes the fabrication of an HBT based on MoS2/Si heterojunction, demonstrating high sensitivity over a wide range of wavelengths. The fabricated device shows a Responsivity of about 400 A/W at 380 nm, one order of magnitude higher than previous MoS2-based photodetectors, with a gain of about 1200. These results pave the way for highly sensitive broadband photodetectors with a simple and low-cost fabrication process suitable for Si-based integrated electronics.
MoS2 has been well established as a promising two-dimensional candidate for optoelectronic applications, due to its unique optical and electrical properties. Here, we report fabrication of a novel heterojunction bipolar transistor (HBT) based on MoS2/Si heterojunction for the first time. Optoelectronic properties of the fabricated MoS2/Si-based HBT confirm the high-sensitivity of the device to a broad range of incident wavelengths from 380 nm to 810 nm. A Responsivity of about 400 A/W, one order of magnitude higher than the previously reported MoS2 based photodetectors, and a gain of about 1200 are obtained in response to the incident wavelength of 380 nm by the fabricated device. Our results open up a way to fabricate highly sensitive broad band photodetectors with a simple and low cost fabrication process, suitable for Si-based integrated electronics.
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