| 负微分迁移率和碰撞电离对GaAs光导开关非线性特性的影响 |
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| 引用本文： | 张同意,石顺祥,赵卫,龚仁喜,孙艳玲.负微分迁移率和碰撞电离对GaAs光导开关非线性特性的影响[J].光子学报,2002,31(4):445-449. |
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| 作者姓名： | 张同意 石顺祥 赵卫 龚仁喜 孙艳玲 |
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| 作者单位： | 1. 西安电子科技大学技术物理学院,西安,710071
2. 中国科学院西安光学精密机械研究所瞬态光学技术国家重点实验室,西安,710068 |
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| 基金项目： | 国家自然科学基金资助项目 ( 6 9781 0 0 2 ) |
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| 摘 要： | 对GaAs光导开关非线性工作时,负微分迁移率和碰撞电离的作用进行了数值分析,给出了考虑和未考虑碰撞电离作用时的外电路电流输出波形,以及载流子和电场的空间分布和随时间演变的情况.计算表明GaAs材料的负微分迁移率引起的微分负阻,会导致阴极附近电场的动态增强,使得阴极附近的电场达到本征碰撞电离发生的阈值电场,从而引发本征碰撞电离的发生.分析结果表明,碰撞电离可以极大地延长电流输出的时间,但仅考虑负微分迁移率特性的本征碰撞电离过程不足以完全解释观察到的所有非线性现象,必须进一步考虑其它高电场效应.
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| 关 键 词： | 光导半导体开关 非线性工作模式 负微分迁移率 碰撞电离 模拟计算 |
| 收稿时间： | 2001/7/19 |
| 修稿时间： | 2001年7月19日 |
THE EFFECT OF NEGATIVE DIFFERENTIAL MOBILITY AND IMPACT IONIZATION ON NONLINEARITY OF GaAs PHOTOCONDUCTIVE SEMICONDUCTOR SWITCH |
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| Zhang Tongyi ,Shi Shunxiang ,Zhao Wei ,Gong Renxi ,Sun Yanling School of Technique Physics,Xidian University,Xi'an State Key Laboratory of Transient Optics Technology,Xi'an.THE EFFECT OF NEGATIVE DIFFERENTIAL MOBILITY AND IMPACT IONIZATION ON NONLINEARITY OF GaAs PHOTOCONDUCTIVE SEMICONDUCTOR SWITCH[J].Acta Photonica Sinica,2002,31(4):445-449. |
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| Authors: | Zhang Tongyi Shi Shunxiang Zhao Wei Gong Renxi Sun Yanling School of Technique Physics Xidian University Xi'an State Key Laboratory of Transient Optics Technology Xi'an |
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| Institution: | Zhang Tongyi 1,Shi Shunxiang 1,Zhao Wei 2,Gong Renxi 1,Sun Yanling 1 School of Technique Physics,Xidian University,Xi'an 710071 State Key Laboratory of Transient Optics Technology,Xi'an 710068 |
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| Abstract: | The role of negative differential mobility and impact ionization in nonlinear operation of PCSS is analyzed.The output current profiles with and without impact ionization are presented.The spatial distribution and temporal evolution of electric field and current density are also presented.The simulation results show that the negative differential resistance due to negative differential mobility of GaAs lead to electric field enhancing enough near cathode to give rise impact ionization.It shows that impact ionization prolong conduction time.However,it is not enough only negative differential mobility and impact ionization to be considered to explain all nonlinear phenomena observed experimentally. |
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| Keywords: | PCSS's Nonlinear operation mode Negative differential mobility Impact ionization Numerical simulation |
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