期刊
NANO LETTERS
卷 16, 期 3, 页码 1560-1567出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04066
关键词
WS2; 2D semiconductor; chemical vapor deposition; light-emitting diode; valley polarization; chiral electroluminescence
类别
资金
- Ministry of Education Tier 2 from Nanyang Technological University (NTU) [MOE2012-T2-2-049]
- Natural Science Foundation of Jiangsu Province [BM2012010]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [YX03001]
- Ministry of Education of the People's Republic of China [IRT1148]
- Synergetic Innovation Center for Organic Electronics and Information Displays
- National Natural Science Foundation of China from Nanjing Tech University (Nanjing Tech) [61136003, 51173081]
Owing to direct band gap and strong spin-orbit coupling, monolayer transition-metal dichalcogenides (TMDs) exhibit rich new physics and great applicable potentials. The remarkable valley contrast and light emission promise such two-dimensional (2D) semiconductors a bright future of valleytronics and light-emitting diodes (LEDs). Though the electroluminescence (EL) has been observed in mechanically exfoliated small flakes of TMDs, considering real applications, a strategy that could offer mass-product and high compatibility is greatly demanded. Large-area and high-quality samples prepared by chemical vapor deposition (CVD) are perfect candidates toward such goal. Here, we report the first demonstration of electrically tunable chiral EL from CVD-grown monolayer WS2 by constructing a p-i-n heterojunction. The chirality contrast of the overall EL reaches as high as 81% and can be effectively modulated by forward current. The success of fabricating valley LEDs based on CVD WS2 opens up many opportunities for developing large-scale production of unconventional 2D optoelectronic devices.
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