Journal
SCIENTIFIC REPORTS
Volume 5, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/srep11830
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Funding
- National High Technology Research and Development Program of China (863 Program) [2013AA031903]
- youth 973 program [2015CB932700]
- National Natural Science Foundation of China [51222208, 51290273, 91433107]
- Ministry of Education of China [20123201120026]
- ARC [DE120101569, DP140101501]
- Engineering Seed Funding Scheme from Monash University
- Postdoctoral Science Foundation of China [7131701013]
- Hong Kong Scholars Program [G-YZ36]
- Soochow University [32317156, 32317267]
- Australian Research Council [DE120101569] Funding Source: Australian Research Council
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Molybdenum disulphide (MoS2), which is a typical semiconductor from the family of layered transition metal dichalcogenides (TMDs), is an attractive material for optoelectronic and photodetection applications because of its tunable bandgap and high quantum luminescence efficiency. Although a high photoresponsivity of 880-2000 AW(-1) and photogain up to 5000 have been demonstrated in MoS2-based photodetectors, the light absorption and gain mechanisms are two fundamental issues preventing these materials from further improvement. In addition, it is still debated whether monolayer or multilayer MoS2 could deliver better performance. Here, we demonstrate a photoresponsivity of approximately 10(4) AW(-1) and a photogain of approximately 10(7) electrons per photon in an n-n heterostructure photodetector that consists of a multilayer MoS2 thin film covered with a thin layer of graphene quantum dots (GQDs). The enhanced light-matter interaction results from effective charge transfer and the re-absorption of photons, leading to enhanced light absorption and the creation of electron-hole pairs. It is feasible to scale up the device and obtain a fast response, thus making it one step closer to practical applications.
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