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A Bilayer 2D-WS(2)/Organic-Based Heterojunction for High-Performance Photodetectors

Two-dimensional (2D) tungsten disulfide (WS(2)) has inspired great efforts in optoelectronics, such as in solar cells, light-emitting diodes, and photodetectors. However, chemical vapor deposition (CVD) grown 2D WS(2) domains with the coexistence of a discontinuous single layer and multilayers are s...

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Detalles Bibliográficos
Autores principales: Huang, Feng, Li, Jing Zhou, Xu, Zhu Hua, Liu, Yuan, Luo, Ri Peng, Zhang, Si Wei, Nie, Peng Bo, Lv, Yan Fei, Zhao, Shi Xi, Su, Wei Tao, Li, Wen Di, Zhao, Shi Chao, Wei, Guo Dan, Kuo, Hao Chung, Kang, Fei Yu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6781271/
https://www.ncbi.nlm.nih.gov/pubmed/31540315
http://dx.doi.org/10.3390/nano9091312
Descripción
Sumario:Two-dimensional (2D) tungsten disulfide (WS(2)) has inspired great efforts in optoelectronics, such as in solar cells, light-emitting diodes, and photodetectors. However, chemical vapor deposition (CVD) grown 2D WS(2) 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-WS(2)/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 WS(2) domains, and promoted the separation of electron-hole pairs. The generated exciton could sufficiently diffuse to the interface of the WS(2) 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 × 10(11) 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.