Nano Research

, Volume 11, Issue 6, pp 3233–3243 | Cite as

Heterostructured graphene quantum dot/WSe2/Si photodetector with suppressed dark current and improved detectivity

  • Mengxing Sun
  • Qiyi Fang
  • Dan XieEmail author
  • Yilin Sun
  • Liu Qian
  • Jianlong Xu
  • Peng Xiao
  • Changjiu Teng
  • Weiwei Li
  • Tianling Ren
  • Yanfeng ZhangEmail author
Research Article


A high-performance heterojunction photodetector is formed by combining an n-type Si substrate with p-type monolayer WSe2 obtained using physical vapor deposition. The high quality of the WSe2/Si heterojunction is demonstrated by the suppressed dark current of 1 nA and the extremely high rectification ratio of 107. Under illumination, the heterojunction exhibits a wide photoresponse range from ultraviolet to near-infrared radiation. The introduction of graphene quantum dots (GQDs) greatly elevates the photodetective capabilities of the heterojunction with strong light absorption and long carrier lifetimes. The GQDs/WSe2/Si heterojunction exhibits a high responsivity of ∼ 707 mA·W–1, short response time of 0.2 ms, and good specific detectivity of ∼ 4.51 × 109 Jones. These properties suggest that the GQDs/WSe2/Si heterojunction holds great potential for application in future high-performance photodetectors.


heterojunction photodetector Si WSe2 graphene quantum dots 


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This work was supported by the National Natural Science Foundation of China (NSFC) (Nos. 51672154 and 51372130), MoST(No. 2016YFA0200200), Natural Science Foundation of Jiangsu Province (No. BK20160328), and Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics (No. KF201517).

Supplementary material

12274_2017_1855_MOESM1_ESM.pdf (1.3 mb)
Heterostructured graphene quantum dot/WSe2/Si photodetector with suppressed dark current and improved detectivity


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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Mengxing Sun
    • 1
  • Qiyi Fang
    • 2
  • Dan Xie
    • 1
    Email author
  • Yilin Sun
    • 1
  • Liu Qian
    • 3
  • Jianlong Xu
    • 4
  • Peng Xiao
    • 4
  • Changjiu Teng
    • 1
  • Weiwei Li
    • 1
  • Tianling Ren
    • 1
  • Yanfeng Zhang
    • 2
    Email author
  1. 1.Institute of Microelectronics & Tsinghua National Laboratory for Information Science and Technology (TNList)Tsinghua UniversityBeijingChina
  2. 2.Department of Materials Science and Engineering, College of EngineeringPeking UniversityBeijingChina
  3. 3.Department of ChemistryTsinghua UniversityBeijingChina
  4. 4.Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesSoochow UniversitySuzhouChina

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