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An in-plane WSe2 p–n homojunction two-dimensional diode by laser-induced doping : An in-plane WSe2 p-n homojunction two-dimensional diode by laser-induced doping

Cited 18 time in Web of Science Cited 19 time in Scopus
Authors

Yang, Sujeong; Lee, Geonyeop; Kim, Janghyuk; Yang, Seunghoon; Lee, Chul-Ho; Kim, Jihyun

Issue Date
2020-07
Publisher
Royal Society of Chemistry
Citation
Journal of Materials Chemistry C, Vol.8 No.25, pp.8393-8398
Abstract
Conventional doping schemes of Si microelectronics are inadequate for atomic-thickness two-dimensional (2D) semiconductors, which makes it challenging to construct 2D p-n homojunctions. Herein, a UV laser-assisted doping method with addressability is proposed for seamlessly building a 2D WSe2 p-n homojunction. WSe2 with ambipolar transport properties was exposed to a focused UV laser to form WOx in a self-limiting and area-selective process that induces hole doping in the underlying WSe2 via electron transfer. Different electrical behaviors, ranging from p-p to p-n in-plane homojunctions, were observed between the as-exfoliated (ambipolar) region and the UV laser-treated (p-doped) region, under the electrostatic modulation of the back-gate bias (V-BG), resulting in the multi-state rectification ratios of 895 (positive V-BG) and similar to 4 (negative V-BG). The evolution of the depletion region in the WSe2 in-plane homojunction was analyzed at different V-BG using the scanning photocurrent mapping approach, yielding a high photocurrent of 1.8 nA for positive V-BG, owing to the development of the p-n junction. Finally, a WSe2-based 2D homogeneous complementary inverter is demonstrated with a voltage gain of 1.8, thereby paving the way for next-generation atomic-thickness circuitry.
ISSN
2050-7526
URI
https://hdl.handle.net/10371/202250
DOI
https://doi.org/10.1039/d0tc01790f
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  • College of Engineering
  • Department of Electrical and Computer Engineering
Research Area 2차원 반도체 소자 및 재료, High-Performance 2D Electronics, Low-Power 2D Electronics, 뉴로모픽 소자 및 응용기술, 저전력 소자 및 소자물리

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