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Proceedings Paper

Identification of the active photo-excited carrier in reverse biased quantum dot resonant tunneling diode
Author(s): Wangping Wang; Wenxin Wang; Hong Chen; Junming Zhou; Dayuan Xiong
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Paper Abstract

The active photo-excited carrier has been identified in reverse biased quantum dot resonant tunneling diode (QDRTD) for light detection. The QD is embedded on the AlAs/GaAs/AlAs double barrier part of the material structure and is found with strong charge memory effect. The QD is charged with electrons in forward bias and the charge storage of QD is maintained well in reverse bias until the voltage of QD resonant tunneling peak. With this charge memory effect, the photo-excited holes are charged into QDs in forward bias and still influence the reverse bias behavior of QDRTD at dark. Compared to the illuminated QDRTD in reverse bias, the active photo-excited carrier of reverse biased QDRTD is unambiguously identified as photo-excited holes. The potential profile of QDRTD structure is also calculated and the potential near charged QDs is found greatly pushed up above GaAs EC. This may explain the trapping of photo-excited hole by QD for QDRTD in reverse bias.

Paper Details

Date Published: 22 October 2010
PDF: 7 pages
Proc. SPIE 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, 76581C (22 October 2010); doi: 10.1117/12.866680
Show Author Affiliations
Wangping Wang, Shanghai Institute of Technical Physics (China)
Wenxin Wang, Institute of Physics (China)
Hong Chen, Institute of Physics (China)
Junming Zhou, Institute of Physics (China)
Dayuan Xiong, East China Normal Univ. (China)


Published in SPIE Proceedings Vol. 7658:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology
Yadong Jiang; Bernard Kippelen; Junsheng Yu, Editor(s)

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