Auger scattering dynamic of photo-excited hot carriers in nano-graphite film

被引:74
|
作者
Du, Sichao [1 ,2 ]
Yin, Juxin [1 ]
Xie, Hao [1 ,2 ]
Sun, Yunlei [1 ]
Fang, Tao [1 ]
Wang, Yu [1 ]
Li, Jing [1 ]
Xiao, Duo [1 ]
Yang, Xiaoguang [3 ]
Zhang, Shuo [2 ]
Wang, Dawei [2 ,4 ]
Chen, Wenchao [5 ]
Yin, Wen-Yan [2 ]
Zheng, Rongkun [6 ,7 ]
机构
[1] Zhejiang Univ City Coll, Sch Informat & Elect Engn, Hangzhou 310015, Zhejiang, Peoples R China
[2] Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China
[3] Chinese Acad Sci, Inst Semicond, Beijing 100083, Peoples R China
[4] Hangzhou Dianzi Univ, Sch Elect & Informat, Hangzhou 310018, Zhejiang, Peoples R China
[5] Zhejiang Univ, Univ Illinois Urbana Champaign Inst, Haining 314400, Zhejiang, Peoples R China
[6] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia
[7] Univ Sydney, Australian Inst Nanoscale Sci & Technol, Sydney, NSW 2006, Australia
基金
中国博士后科学基金;
关键词
MULTIPLICATION; GRAPHENE; PHOTOCURRENT; GENERATION;
D O I
10.1063/5.0116720
中图分类号
O59 [应用物理学];
学科分类号
摘要
Charge carrier scattering channels in graphite bridging its valence and conduction band offer an efficient Auger recombination dynamic to promote low energy charge carriers to higher energy states. It is of importance to answer the question whether a large number of charge carriers can be promoted to higher energy states to enhance the quantum efficiency of photodetectors. Here, we present an experimental demonstration of an effective Auger recombination process in the photo-excited nano-graphite film. The time-resolved hot carrier thermalization was analyzed based on the energy dissipation via the Auger scattering channels. We split the Auger recombination occurrence centered at 0.40 eV energy state into scattering and recombination parts, for characterizing the scattering rate in the conduction band and the recombination rate toward the valence band. The scattering time with respect to the energy state was extracted as 8 ps . eV(-1), while the recombination time with respect to the energy state was extracted as 24 ps . eV(-1). Our study indicates a 300 fs delay between the hot carrier recombination and generation, leading to a 10(5) ps(-1) . cm(-3) Auger scattering efficiency. The observed duration for the Auger recombination to generate hot carriers is prolonged for 1 ps, due to the hot carriers energy relaxation bottleneck with optical-phonons in the nano-graphite. The presented analytic expression gives valuable insights into the Auger recombination dynamic to estimate its most efficient energy regime for mid-infrared photodetection. Published under an exclusive license by AIP Publishing.
引用
收藏
页数:7
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