Abstract
We report a visible-blind ultraviolet photoconductive detector with interdigitated electrodes based on (KTO) single crystals. Both the steady spectral responses and the transient photovoltaic measurements clearly exhibit a cutoff wavelength at 344 nm (), in accordance with the bandgap of KTO. The KTO photodetectors show a low dark current at 20 V, and a high UV-to-visible rejection ratio with 3 orders of magnitude at room temperature. The quantum efficiency is 37.49% under 20 V bias, and the detectivity of , which is comparable to that of silicon photodetectors in the UV region. The rise time of photoelectric response is , indicating an ultrafast photoelectric response characteristic. The present work offers appealing prospects for the application of KTO materials in high-performance visible blind ultraviolet photodetectors.
© 2016 Optical Society of America
Full Article | PDF ArticleMore Like This
Er-Jia Guo, Hui-Bin Lu, Meng He, Jie Xing, Kui-Juan Jin, and Guo-Zhen Yang
Appl. Opt. 49(14) 2557-2560 (2010)
Wenzhen Wang, Haitao Xu, Jiang Cai, Jiabin Zhu, Chaowei Ni, Feng Hong, Zebo Fang, Fuzong Xu, Siwei Cui, Run Xu, Linjun Wang, Fei Xu, and Jian Huang
Opt. Express 24(8) 8411-8419 (2016)
J. Xing, K. Zhao, H. B. Lu, X. Wang, G. Z. Liu, K. J. Jin, M. He, C. C. Wang, and G. Z. Yang
Opt. Lett. 32(17) 2526-2528 (2007)