Annealing effects and DLTS study on PNP silicon bipolar junction transistors irradiated by 20 MeV Br ions

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• 作者：Chaoming Liu ; Xingji Li ; Jianqun Yang ; Joachim Bollmann
• 关键词：Bipolar junction transistors ; Annealing effects ; Heavy ions ; Gain degradation
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：21 January, 2014
• 年：2014
• 卷：735
• 期：Complete
• 页码：462-465
• 全文大小：551 K

文摘

Isochronal anneal sequences have been carried out on 3CG130 silicon PNP bipolar junction transistors (BJTs) irradiated with 20 MeV bromine (Br) heavy ions. The Gummel curve was utilized to characterize the annealing behavior of defects in both the emitter-base depletion region and the neutral base. The results show that the base current (I_B) decreases with the increasing annealing temperature, while the collector current (I_C) keeps invariably. The current gain varies slightly, when the annealing temperature (T_A) is lower than 500 K, while varies rapidly at T_A>550 K, and the current gain of the 3CG130 BJT annealing at 700 K almost restore to that of the pre-radiation transistor. The deep level transient spectroscopy (DLTS) data was used to assign the relative magnitude of each of the important defects. Based on the in situ electrical measurement and DLTS spectra, it is clear that the V₂(+/0) trap is the main contribution to the degradation of current gain after the 20 MeV Br ions irradiation. The V₂(+/0) peak has many characteristics expected for the current gain degradation.