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Open AccessArticle

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

1
College of Materials & Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
2
Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
3
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518000, China
4
Department of Mechanical Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China
5
Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
6
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; https://doi.org/10.3390/nano9091312
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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