Production of High-Performance CdZnTe Crystals Grown by THM for Radiation Detection Applications


ÜNAL M., BALBAŞI Ö. B. , Karaman M. C. , Genç A. M. , PARLAK M., TURAN R.

Journal of Electronic Materials, vol.51, no.9, pp.4675-4680, 2022 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 51 Issue: 9
  • Publication Date: 2022
  • Doi Number: 10.1007/s11664-022-09663-y
  • Journal Name: Journal of Electronic Materials
  • Journal Indexes: Science Citation Index Expanded, Scopus, PASCAL, Applied Science & Technology Source, Chemical Abstracts Core, Chimica, Compendex, Computer & Applied Sciences, INSPEC
  • Page Numbers: pp.4675-4680
  • Keywords: Crystal growth, CdZnTe crystals, THM growth, electrode deposition, gamma-ray detectors, TRAVELING HEATER METHOD, CDTE SINGLE-CRYSTALS, X-RAY, IMPROVEMENT, DEFECTS

Abstract

© 2022, The Minerals, Metals & Materials Society.CdZnTe crystals are the perfect candidate to be used in room temperature x-ray and gamma-ray detection systems. Production of detector-grade crystals, on the other hand, is challenging due to the unique properties of the CdZnTe. CdZnTe crystals are soft-brittle materials and have high ionicity of bonds that makes the growth process challenging. Among several growth techniques, the travelling heater method (THM) is a preferred growth method to obtain high-quality crystals with high yield thanks to low segregation of Zn and usage of the seed crystal. In this paper, the production of high-quality CdZnTe crystals is presented. Growth, surface preparation, and contact deposition steps are summarized. CdZnTe crystals with resistivity around 6.1 × 109 Ω cm, mobility-lifetime product around 6.7 × 10−3 cm2/V, and leakage current as low as 2 nA at 200 V bias voltage are obtained, which is compatible with commercially available CdZnTe crystals.