Al-doped ZnO contact to CdZnTe for x- and gamma-ray detector applications

作者：Roy U N^*; Camarda G S; Cui Y; Gul R; Hossain A; Yang G; Mundle R M; Pradhan A K; James R B

来源：Applied Physics Letters, 2016, 108(24): 242106.

DOI：10.1063/1.4953883

The poor adhesion of common metals to CdZnTe (CZT)/CdTe surfaces has been a long-standing challenge for radiation detector applications. In this present work, we explored the use of an alternative electrode, viz., Al-doped ZnO (AZO) as a replacement to common metallic contacts. ZnO offers several advantages over the latter, such as having a higher hardness, a close match of the coefficients of thermal expansion for CZT and ZnO, and better adhesion to the surface of CZT due to the contact layer being an oxide. The AZO/CZT contact was investigated via high spatial-resolution X-ray response mapping for a planar detector at the micron level. The durability of the device was investigated by acquiring I-V measurements over an 18-month period, and good long-term stability was observed. We have demonstrated that the AZO/CZT/AZO virtual-Frisch-grid device performs fairly well, with comparable or better characteristics than that for the same detector fabricated with gold contacts. Published by AIP Publishing.

• 出版日期2016-6-13