期刊
IEEE JOURNAL OF QUANTUM ELECTRONICS
卷 45, 期 3, 页码 300-303出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2009.2013093
关键词
Avalanche photodiodes (APDs); photodetector; silicon carbide; ultraviolet (UV) detector
资金
- Defense Advanced Research Projects Agency
- Army Research Laboratory
We report large-area, 250-mu m-diameter, 4H-SiC avalanche photodiodes with low dark current and high gain. At room temperature, the dark current density is 59.5 nA/cm(2) at a gain of 1000. An external quantum efficiency of 48% at 280 nm is achieved at unity gain with a recessed-window structure. The differential resistance of the recessed-window device at zero bias is estimated to be 6 x 10(14) Omega. As a result of high external quantum efficiency, large area, and large differential resistance, a record high specific detectivity of 4.1 x 10(14) cmHz(1/2) W-1, has been achieved. In Geiger mode operation, high single photon detection efficiency of 30% with dark count probability of 8 x 10(-4) is reported.
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