Two-micron-wavelength germanium-tin photodiodes with low dark current and gigahertz bandwidth

被引:92
作者
Dong, Yuan [1 ]
Wang, Wei [1 ]
Xu, Shengqiang [1 ]
Lei, Dian [1 ]
Gong, Xiao [1 ]
Guo, Xin [2 ]
Wang, Hong [2 ]
Lee, Shuh-Ying [2 ]
Loke, Wan-Khai [2 ]
Yoon, Soon-Fatt [2 ]
Yeo, Yee-Chia [1 ]
机构
[1] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore
[2] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
关键词
MU-M; SI; PHOTODETECTORS;
D O I
10.1364/OE.25.015818
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We report the demonstration of a germanium-tin (Ge0.9Sn0.1) multiple-quantum-well p-i-n photodiode on silicon (Si) substrate for 2 mu m-wavelength light detection. Characterization of the photodetector in both direct current (DC) and radio frequency (RF) regimes was performed. At the bias voltage of -1 V, a dark current density of 0.031 A/cm(2) is realized at room-temperature, which is among the lowest reported values for Ge1-xSnx-on-Si p-i-n photodiodes. In addition, for the first time, a 3 dB bandwidth (f(3dB)) of around 1.2 GHz is achieved in Ge1-xSnx photodetectors operating at 2 mu m. It is anticipated that further device optimization would extend the f3dB to above 10 GHz. (C) 2017 Optical Society of America
引用
收藏
页码:15818 / 15827
页数:10
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