本文通过附着力测试,应力模拟和IV特性及多道能谱分析对Au-CZT与Au/Cr-CZT接触进行研究.结果表明采用Au/Cr复合电极可提高电极附着强度和热稳定性.在老化实验中,Au-CZT界面附着力下降了61.98%,而Au/Cr-CZT仅降低28%.Au/Cr电极器件的漏电流较低,~(241)Am射线下能谱响应更佳.分析其原因可能是Au与CZT间的Cr层降低了接触层内的热应力,合金化过程促进了金-半界面的互扩散,使Au和CZT更易形成欧姆接触,综合考虑Au/Cr复合电极能获得比Au电极更理想的接触性能.
In this paper, the properties of Au/Cr-CZT contacts, comparing with Au-CZT, were investigated by shearing tests, stress simulation, current-voltage test, and the multitude channel pulse-height analysis. It was shown that the adhesion strength and the thermal stability of Au/Cr compound electrode was improved compared to Au electrode contact. During the aging tests, the adhesion strength of Au/Cr compound electrode decreased by 28%, while the one with Au contact was decreased by 61.98%. Detector with Au/Cr compound electrode exhibited lower leakage current and better spectra performance. The possible reason is that the coefficient of thermal expansion of Cr matches more with CZT, rather than Au, conducing to smaller thermal stress in the contact interface. In addition the alloying process will promote the inter-diffusion at the metal-semiconductor interface, and better ohmic contact could be obtained. Consequently Au/Cr compound electrode on CdZnTe is more reasonable to gain better contact.
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