journal article·2017-10-04

Synthesis of Ultrathin Composition Graded Doped Lateral WSe2/WS2 Heterostructures

Zhipeng Li, Jialu Zheng, Yupeng Zhang, Changxi Zheng, Wei-Yen Woon, Min-Chiang Chuang, Hung-Chieh Tsai, Chia-Hao Chen, Asher Davis, Zai-Quan Xu, Jiao Lin, Han Zhang, Qiaoliang Bao

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Abstract

Lateral transition-metal dichalcogenide and their heterostructures have attracted substantial attention, but there lacks a simple approach to produce large-scaled optoelectronic devices with graded composition. In particular, the incorporation of substitution and doping into heterostructure formation is rarely reported. Here, we demonstrate growth of a composition graded doped lateral WSe 2 /WS 2 heterostructure by ambient pressure chemical vapor deposition in a single heat cycle. Through Raman and photoluminescence spectroscopy, we demonstrate that the monolayer heterostructure exhibits a clear interface between two domains and a graded composition distribution in each domain. The coexistence of two distinct doping modes, i.e., interstitial and substitutional doping, was verified experimentally. A distinct three-stage growth mechanism consisting of nucleation, epitaxial growth, and substitution was proposed. Electrical transport measurements reveal that this lateral heterostructure has representative characteristics of a photodiodes. The optoelectronic device based on the lateral WSe 2 /WS 2 heterostructure shows improved photodetection performance in terms of a reasonable responsivity and a large photoactive area
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Research context

OpenAlex topics: 2D Materials and Applications · MXene and MAX Phase Materials · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering and ARC Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET), Monash University, Clayton, Victoria 3800, Australia

College of Electronic Science and Technology and College of Optoelectronics Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China

Department of Physics, National Central University, Jungli 32054, Taiwan, ROC

National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ROC

School of Engineering, RMIT University, Melbourne, VIC 3001, Australia

Institute of Functional Nano and Soft Material (FUNSOM), Jiangsu Key Laboratory for Carbon-Cased Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China

Funding

Ministry of Science and Technology of the People's Republic of China · Natural Science Foundation of Jiangsu Province · Australian Research Council · Jiangsu Science and Technology Department · National Natural Science Foundation of China · Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University · Priority Academic Program Development of Jiangsu Higher Education Institutions

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