Zheng Xialian, Du Qianqian, Yu Chunshuai, Liu Qing, Wang Wenjun, Wang Fengqiu, Qin Shuchao
School of Physical Science and Information Engineering, Key Laboratory of Optical Communication Science and Technology of Shandong Province, Liaocheng University, Liaocheng 252059, China.
School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
ACS Appl Mater Interfaces. 2024 Jul 31;16(30):39737-39744. doi: 10.1021/acsami.4c08895. Epub 2024 Jul 16.
Organic single crystals exhibit improved carrier mobility, longer exciton diffusion length, anisotropic charge transport, and unique linear dichroism, while its high exciton binding energy seriously limits the free-carrier generation and photoelectric conversion efficiency. Layered van der Waals heterostructures, which integrate organic crystals with high mobility two-dimensional (2D) inorganic semiconductors, are promising for promoting exciton dissociation and boosting sensitivity by utilizing the interfacial potential and photogating effect. In this work, organic single-crystal rubrene is integrated with a few-layer WS to design the high-performance photodetector. The device exhibits an excellent responsivity of 1000 A W, and a fast speed of 180 μs, which is far superior to the individual WS device. Equally importantly, this device provides excellent polarization detection performance by virtue of the anisotropic properties of rubrene, and the dichroic ratios are 1.56, 1.5, and 1.7 for 375, 405, and 658 nm irradiation, respectively. Finally, several high-resolution single-pixel broadband polarization imaging was demonstrated. Our work shows that organic-inorganic heterostructure is an essential candidate for improving optoelectronics performance and has potential for polarization imaging.
