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Analysis of negative differential conductance in a GaN/AlN multi-quantum-well avalanche photodiode
Author(s): Wangping Wang; Lai Wang; Mo Li; Qian Li; Jianbin Kang; Yi Luo; Jian Zhang
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Paper Abstract

Recently the GaN/AlN multi-quantum-well structure avalanche photodiode (MAPD) has been demonstrated with PMT-like multiplication gain larger than 1E4. In this work, the photocurrent of GaN/AlN MAPD has been investigated and negative differential conductance (NDC) is found in the photocurrent characteristic of MAPD. Through self-consistent calculation, conduction band structure and discrete energy states in each quantum well layer have been obtained for MAPD. The discrete states drop down and align with the conduction band edge of absorption layer around the NDC peak voltage, so the NDC feature is proposed as resonant tunneling of photoelectrons into MQW structure. The proposed resonant tunneling process is confirmed by the observation of resonant tunneling peaks in a specially designed resonant tunneling diode simulating the band profile of MAPD. The finding of NDC feature is beneficial for understanding and increasing the quantum efficiency of MAPD, since the photoelectron blocking at AlN barrier is greatly reduced by the resonant tunneling process.

Paper Details

Date Published: 20 September 2018
PDF: 6 pages
Proc. SPIE 10729, Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz, 107290D (20 September 2018); doi: 10.1117/12.2320517
Show Author Affiliations
Wangping Wang, Microsystem and Terahertz Research Ctr. (China)
Institute of Electronic Engineering (China)
Lai Wang, Tsinghua Univ. (China)
Mo Li, Microsystem and Terahertz Research Ctr. (China)
Institute of Electronic Engineering (China)
Qian Li, Microsystem and Terahertz Research Ctr. (China)
Institute of Electronic Engineering (China)
Jianbin Kang, Microsystem and Terahertz Research Ctr. (China)
Institute of Electronic Engineering (China)
Yi Luo, Tsinghua Univ. (China)
Jian Zhang, Microsystem and Terahertz Research Ctr. (China)
Institute of Electronic Engineering (China)


Published in SPIE Proceedings Vol. 10729:
Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz
Oleg Mitrofanov; Chee Hing Tan; José Luis Pau Vizcaíno; Manijeh Razeghi, Editor(s)

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