We present on high efficiency metal-insulator-semiconductor (MIS) photodetectors based on amorphous germanium quantum dots (QDs) embedded in a SiO2 matrix. High internal quantum efficiencies (IQE) were achieved across a broad wavelength range, with peak value reaching 700% at-10 V applied bias due to high internal photoconductive gain. The transient photoresponse behavior is also studied and it was found that the response time of the photodetector depends on the thickness of the QD layer. We also discuss the conduction mechanism which leads to the high photoconductive gain. © 2012 IEEE.
Liu, P., Le, S., Lee, S., Paine, D., Zaslavsky, A., Pacifici, D., et al. (2012). Fast, high-efficiency Germanium quantum dot photodetectors. In Proceedings of Lester Eastman Conference on High Performance Devices, LEC 2012 (pp.1-3) [10.1109/lec.2012.6410978].
Fast, high-efficiency Germanium quantum dot photodetectors
Crupi, Isodiana;
2012-01-01
Abstract
We present on high efficiency metal-insulator-semiconductor (MIS) photodetectors based on amorphous germanium quantum dots (QDs) embedded in a SiO2 matrix. High internal quantum efficiencies (IQE) were achieved across a broad wavelength range, with peak value reaching 700% at-10 V applied bias due to high internal photoconductive gain. The transient photoresponse behavior is also studied and it was found that the response time of the photodetector depends on the thickness of the QD layer. We also discuss the conduction mechanism which leads to the high photoconductive gain. © 2012 IEEE.
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