NDLI: Significant Performance Improvement in AlGaN Solar-Blind Avalanche Photodiodes by Exploiting the Built-In Polarization Electric Field

Content Provider	IEEE Xplore Digital Library
Author	Zhenguang Shao Dunjun Chen Yanli Liu Hai Lu Rong Zhang Youdou Zheng Liang Li Kexiu Dong
Copyright Year	1995
Abstract	We present improved AlGaN solar-blind avalanche photodiodes (APDs) with a separate absorption and multiplication (SAM) structure by introducing a polarization electric field with the same direction as reverse bias field in the multiplication region. This polarization electric field can be realized by reducing the Al composition of the p-AlGaN layer in a conventional p-i-n-i-n SAM-APD structure. After employing a reduced-Al-composition p-AlGaN instead of the commonly used p-AlGaN, the polarization enhanced APD exhibits a markedly lower avalanche breakdown voltage and a near two times higher avalanche gain up to 2.1 × 10⁴ compared with its conventional counterpart. In addition, X-ray diffraction and transmission electron microscopy results show that a moderate reduction of Al composition in the p-AlGaN layer does not degrade the crystalline quality of the polarization enhanced APD structure resulted from lattice mismatch, which guarantees the polarization enhanced effect.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	187
Ending Page	192
Page Count	6
File Size	4501344
File Format	PDF
ISSN	1077260X
Volume Number	20
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Educational institutions Aluminum gallium nitride Electric fields Avalanche photodiodes Avalanche breakdown Breakdown voltage Strain solar blind AlGaN avalanche photodiodes polarization electric field avalanche photodiodes (APDs)
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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