IGCT载流子寿命分布特性及参数提取方法研究  

Study on distribution characteristics and parameter extraction method of IGCT carrier lifetime

作　　者：周亚星[1,2] 陈芳林 王佳蕊 孔力 ZHOU Ya-xing;CHEN Fang-lin;WANG Jia-rui;KONG Li(Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Zhuzhou CRRC Times Electric Co.,Ltd.,Zhuzhou 412001,China;State Grid Jilin Electric Power Research Institute,Changchun 132000,China)

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院大学,北京100049 [3]株洲中车时代电气股份有限公司,湖南株洲412001 [4]国网吉林省电力有限公司电力科学研究院,吉林长春132000

出　　处：《电工电能新技术》2020年第2期1-9,共9页Advanced Technology of Electrical Engineering and Energy

基　　金：中国科学院前沿科学重点研究项目(QYZDY-SSW-JSC025)

摘　　要：集成门极换流晶闸管(IGCT)物理模型中载流子寿命与器件动静态特性有着密切联系。现有基于器件关断拖尾电流的载流子寿命参数提取方法,假设关断拖尾电流的衰减主要取决于基区载流子的复合而忽略了阳极电子电流的影响,但IGCT采用透明阳极结构增强了关断时阳极电子的抽离,因此将该方法应用于IGCT存在不足。本文基于掺杂浓度依赖的载流子寿命模型和肖克莱-里德-霍尔(SRH)复合模型,分析了不同区域下载流子寿命的耦合关系;当透明阳极厚度远小于少子扩散长度,将透明阳极侧PN结等效为短二极管,分析了其少数载流子和电流分布特性,并由此提出载流子寿命参数提取的改进方法。最后,根据载流子等效寿命随外加电压变化的特性,实验提取了不同区域下的载流子寿命参数,通过器件双脉冲仿真及实验结果对比验证了参数提取结果的有效性。There is a strong relationship between carrier lifetime of Integrated Gate Commutated Thyristor( IGCT)physical model and dynamic or static characteristics. The existing turn-off current-tail based parameter extraction method of carrier lifetime assumes that the deceasing of current-tail mainly depends on the carrier recombination in N-base neglecting the extraction of electron from anode,therefore there is a limitation when applying to IGCT in which the extraction of electron from anode is enhanced by using transparent anode structure. In this paper,based on doping concentration dependent carrier lifetime model and Shockley-Read-Hall( SRH) recombination model,the coupled relation between carrier lifetimes in different regions is analyzed;the distribution characteristics of minority carrier and its current are discussed and analyzed by taking the PN junction near anode side as a short diode considering that the thickness of transparent anode is much less than the minority carrier diffusion length;then an improved method of carrier lifetime extraction is proposed. At last,the parameters of carrier lifetime in different region are derived from experiment as the effective carrier lifetime varying with the applied voltage;and good agreement between the experimental data and simulation results of double-pulse show the correctness of the proposed method of parameters extraction.

关 键 词：集成门极换流晶闸管 载流子寿命 参数提取 透明阳极 

分 类 号：TM23[一般工业技术—材料科学与工程]