寿命控制技术是现在广泛使用的方法,该方法旨在减少快恢复二极管(FRD)基区载流子寿命从而实现更小的反向恢复时间,同时不可避免地引起其他性能的变化。通过高能电子辐照和扩铂对1 200 V FRD进行了寿命控制,并对铂扩散和电子辐照样品在正向压降温度特性、静态和反向恢复特性等方面进行了对比分析,发现铂扩散样品随扩铂温度的增加,其击穿电压变大;高能电子辐照器件呈现电压正温度系数,其正向压降和反向恢复时间(VF-trr)折中曲线更靠近原点。实验结果表明,高能电子辐照样品具有更好的温度系数、更好的VF-trr折中特性,然而反向电流在125℃却高达约210μA。
The temperature dependences of forward voltage drop（VF） of the fast recovery diodes（FRDs） are remarkably influenced by different lifetime controlled treatments. In this paper the results of an experimental study are presented, which are the lifetime controls of platinum treatment, electron irradiation treatment, and the combined treatment of the above ones.Based on deep level transient spectroscopy（DLTS） measurements, a new level E6（EC-0.376 e V） is found in the combined lifetime treated（CLT） sample, which is different from the levels of the individual platinum and electron irradiation ones. Comparing the tested VFresults of CLT samples with the others, the level E6 is responsible for the degradation of temperature dependence of the forward voltage drop in the FRD.
The addition of a buffer layer can improve the device＇s secondary breakdown voltage, thus, improving the single event burnout （SEB） threshold voltage. In this paper, an N type linear doping buffer layer is proposed. According to quasi-stationary avalanche simulation and heavy ion beam simulation, the results show that an op- timized linear doping buffer layer is critical. As SEB is induced by heavy ions impacting, the electric field of an optimized linear doping buffer device is much lower than that with an optimized constant doping buffer layer at a given buffer layer thickness and the same biasing voltages. Secondary breakdown voltage and the parasitic bipolar turn-on current are much higher than those with the optimized constant doping buffer ~ayer. So the linear buffer layer is more advantageous to improving the device＇s SEB performance.
