標題: | A Bilayer 2D-WS2/Organic-Based Heterojunction for High-Performance Photodetectors |
作者: | 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 光電工程研究所 Institute of EO Enginerring |
關鍵字: | 2D-WS2;photodetector;organic semiconductor;responsivity |
公開日期: | 1-Sep-2019 |
摘要: | 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 x 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. |
URI: | http://dx.doi.org/10.3390/nano9091312 http://hdl.handle.net/11536/153116 |
DOI: | 10.3390/nano9091312 |
期刊: | NANOMATERIALS |
Volume: | 9 |
Issue: | 9 |
起始頁: | 0 |
結束頁: | 0 |
Appears in Collections: | Articles |