標題: Enhanced wavelength-selective photoresponsivity with a MoS2 bilayer grown conformally on a patterned sapphire substrate
作者: Chen, Sung-Wen Huang
Wang, Sheng-Wen
Hong, Kuo-Bin
Medin, Henry
Chung, Chieh-Han
Wu, Chun-Chia
Su, Teng-Yu
Lai, Fang-I
Lee, Po-Tsung
Kuo, Shou-Yi
Kuo, Hao-Chung
Chueh, Yu-Lun
光電工程學系
光電工程研究所
Department of Photonics
Institute of EO Enginerring
公開日期: 14-Feb-2019
摘要: In the present study, novel MoS2 bilayers with 3D structures were considered for their application as wavelength-sensitive photodetectors. Using e-gun deposition and a CVD process, MoS2 bilayers can be grown conformally on a patterned (cones or pyramids) sapphire substrate without any wrinkles on the 2D film. After the sulfurization process, the MoS2 bilayer is subjected to a local strain in the patterns and its band gap gets enlarged due to the strain. This phenomenon is beneficial for photo-devices to enable the collection of the photocurrent. Measurements revealed a broadband enhancement of the MoS2-based photodetector with a patterned array in terms of both absorption and photocurrent. It is noteworthy that a cone-patterned sapphire substrate (CPSS) is able to generate more photocurrent when illuminated under blue light illumination, whereas the pyramid-patterned sapphire substrate (PPSS) performs best under green and red light illumination. Simulations of the electric field distributions for MoS2 coatings on different substrates, based on 3D models, revealed that the sensitivity of the MoS2-based photodetector can be greatly enhanced by the light-scattering effect.
URI: http://dx.doi.org/10.1039/c8tc04097d
http://hdl.handle.net/11536/148914
ISSN: 2050-7526
DOI: 10.1039/c8tc04097d
期刊: JOURNAL OF MATERIALS CHEMISTRY C
Volume: 7
起始頁: 1622
結束頁: 1629
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