题目：

Highly responsive MoS₂ photo detectors enhanced by graphene quantum dots

作者：

Caiyun Chen1,^*, Hong Qiao1,^*, Shenghuang Lin1^,2, Chi Man Luk², Yan Liu¹, Zaiquan Xu³, ingchao Song³, Yunzhou Xue¹, Delong Li⁴, Jian Yuan¹, Wenzhi Yu¹, Chunxu Pan⁴, Shu Ping Lau²& Qiaoliang Bao^1,3

单位：

¹Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, P. R. China.

²Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China.

³Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia.

 ⁴School of Physical and Technology, Wuhan University, Wuhan 430072, P. R. China.

摘要：

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 band gap and high quantum luminescence efficiency. Although a high photoresponsivity of 880�2000 AW−1and photogain up to 5000 have been demonstrated in MoS2-based photo detectors, 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 MoS2could deliver better performance. Here, we demonstrate a photoresponsivity of approximately 10⁴AW−1and a photogain of approximately 10⁷electrons per photon in an n-n heterostructure photodetector that consists of a multilayer MoS2thin 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.

影响因子：

5.078

分区情况：

2区

链接：

http://www.nature.com/srep/2015/150703/srep11830/full/srep11830.html?

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