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Open AccessArticle

A Bilayer 2D-WS2/Organic-Based Heterojunction for High-Performance Photodetectors

College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518000, China
Department of Mechanical Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China
Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Department of Electrical Engineering and Computer Sciences and Tsinghua-Berkeley Shenzhen Institute (TBSI), University of California at Berkeley, Berkeley, CA 94720, USA
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2019, 9(9), 1312;
Received: 16 August 2019 / Revised: 9 September 2019 / Accepted: 10 September 2019 / Published: 13 September 2019
(This article belongs to the Special Issue Quantum Dots and Micro-LED Display)
Two-dimensional (2D) tungsten disulfide (WS2) has inspired great efforts in optoelectronics, such as in solar cells, light-emitting diodes, and photodetectors. However, chemical vapor deposition (CVD) grown 2D WS2 domains with the coexistence of a discontinuous single layer and multilayers are still not suitable for the fabrication of photodetectors on a large scale. An emerging field in the integration of organic materials with 2D materials offers the advantages of molecular diversity and flexibility to provide an exciting aspect on high-performance device applications. Herein, we fabricated a photodetector based on a 2D-WS2/organic semiconductor materials (mixture of the (Poly-(N,N′-bis-4-butylphenyl-N,N′-bisphenyl) benzidine and Phenyl-C61-butyric acid methyl ester (Poly-TPD/PCBM)) heterojunction. The application of Poly-TPD/PCBM organic blend film enhanced light absorption, electrically connected the isolated WS2 domains, and promoted the separation of electron-hole pairs. The generated exciton could sufficiently diffuse to the interface of the WS2 and the organic blend layers for efficient charge separation, where Poly-TPD was favorable for hole carrier transport and PCBM for electron transport to their respective electrodes. We show that the photodetector exhibited high responsivity, detectivity, and an on/off ratio of 0.1 A/W, 1.1 × 1011 Jones, and 100, respectively. In addition, the photodetector showed a broad spectral response from 500 nm to 750 nm, with a peak external quantum efficiency (EQE) of 8%. Our work offers a facile solution-coating process combined with a CVD technique to prepare an inorganic/organic heterojunction photodetector with high performance on silicon substrate. View Full-Text
Keywords: 2D-WS2; photodetector; organic semiconductor; responsivity 2D-WS2; photodetector; organic semiconductor; responsivity
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Huang, F.; Li, J.Z.; Xu, Z.H.; Liu, Y.; Luo, R.P.; Zhang, S.W.; Nie, P.B.; Lv, Y.F.; Zhao, S.X.; Su, W.T.; Li, W.D.; Zhao, S.C.; Wei, G.D.; Kuo, H.C.; Kang, F.Y. A Bilayer 2D-WS2/Organic-Based Heterojunction for High-Performance Photodetectors. Nanomaterials 2019, 9, 1312.

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