| 半绝缘GaAs光电导开关的光控预击穿特性 |
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| 引用本文： | 马湘蓉,施卫,纪卫莉,薛红.半绝缘GaAs光电导开关的光控预击穿特性[J].半导体学报,2011,32(12):124006-6. |
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| 作者姓名： | 马湘蓉 施卫 纪卫莉 薛红 |
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| 作者单位： | Institute of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, China;Department of Applied Physics, Xi’an University of Technology, Xi’an 710048, China;Department of Applied Physics, Xi’an University of Technology, Xi’an 710048, China;Department of Applied Physics, Xi’an University of Technology, Xi’an 710048, China |
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| 摘 要： | 用波长1064nm，触发光能为0.5mJ的激光脉冲触发电极间隙为4mm的半绝缘（SI）GaAs光电导开关，当偏置电压达到4kV时，开关并未引发自持放电，而是进入非线性（lock-on）工作模式，即开关处于光控预击穿状态。分析认为：通过激子的产生和离解激子效应贡献了光电导；碰撞电离、雪崩倍增、激子效应补充了因外界光源撤出后所需的载流子浓度和能量。在上述因素的相互作用下，SI-GaAs 光电导开关并没有引发自持放电而是处于光控预击穿状态，丝状电流特性影响着开关的损伤程度。
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| 关 键 词： | 半绝缘砷化镓 光电导开关 光控制 激光脉冲触发 脉冲能量 激子效应 载流子浓度 PCSS |
| 修稿时间： | 8/4/2011 4:39:36 PM |
Light controlled prebreakdown characteristics of a semi-insulating GaAs photoconductive switch |
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| Ma Xiangrong,Shi Wei,Ji Weili and Xue Hong.Light controlled prebreakdown characteristics of a semi-insulating GaAs photoconductive switch[J].Chinese Journal of Semiconductors,2011,32(12):124006-6. |
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| Authors: | Ma Xiangrong Shi Wei Ji Weili and Xue Hong |
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| Affiliation: | 1 Institute of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, China 2Department of Applied Physics, Xi＇an University of Technology, Xi＇an 710048, China) |
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| Abstract: | A 4 mm gap semi-insulating (SI) GaAs photoconductive switch (PCSS) was triggered by a pulse laser with a wavelength of 1064 nm and a pulse energy of 0.5 mJ. In the experiment, when the bias field was 4 kV, the switch did not induce self-maintained discharge but worked in nonlinear (lock-on) mode. The phenomenon is analyzed as follows: an exciton effect contributes to photoconduction in the generation and dissociation of excitons. Collision ionization, avalanche multiplication and the exciton effect can supply carrier concentration and energy when an outside light source was removed. Under the combined influence of these factors, the SI-GaAs PCSS develops into self-maintained discharge rather than just in the light-controlled prebreakdown status. The characteristics of the filament affect the degree of damage to the switch. |
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| Keywords: | light controlled prebreakdown photo activated charge domain self-maintained discharge exciton effect |
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