Jpn. J. Appl. Phys. 51 (2012) 04DG15 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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GaN-Based Metal–Insulator–Semiconductor Ultraviolet Photodetectors with CsF Current-Suppressing Layer

Chin-Hsiang Chen, Chia-Ming Tsai, Chung-Fu Cheng, Shuo-Fu Yen, Peng-Yin Su, Yu-Hsuan Tsai, and Cheng-Nan Tsai

Department of Electronic Engineering, Cheng Shiu University, Kaohsiung 830, Taiwan, R.O.C.

(Received September 26, 2011; accepted January 6, 2012; published online April 20, 2012)

GaN metal–insulator–semiconductor (MIS) ultraviolet (UV) photodetectors (PDs) with the CsF current-suppressing layer were, for the first time, fabricated and characterized successfully. It was found that we can achieve a low dark current and large photocurrent-to-dark-current contrast ratio from the proposed devices with the use of the CsF current-suppressing layer. With a 5 V applied bias, it was found that the leakage current of the fabricated MIS PDs with the CsF current-suppressing layer was 7.1×10-10 A. This small leakage current should be attributed to the large barrier height caused by the insertion of the CsF current-suppressing layer. With a 5 V applied bias, the barrier height of ΦB = 0.942 can be calculated from the dark current–voltage (IV) characteristics. We can also achieve a large UV-to-visible rejection ratio from the PDs with the CsF current-suppressing layer.

URL: http://jjap.jsap.jp/link?JJAP/51/04DG15/
DOI: 10.1143/JJAP.51.04DG15


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