Effect of the metal nature on the I-V characteristics of CdTe diodes for ionizing radiation detectors

Valeriy Sklyarchuk; Volodymyr Gnatyuk; Toru Aoki

doi:10.1117/12.2676538

3 October 2023 Effect of the metal nature on the I-V characteristics of CdTe diodes for ionizing radiation detectors

Valeriy Sklyarchuk, Volodymyr Gnatyuk, Toru Aoki

Proceedings Volume 12696, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXV; 126960L (2023) https://doi.org/10.1117/12.2676538
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Conference Poster

Abstract

The electrical characteristics of CdTe-based surface barrier structures, which can be used as spectroscopic X/γ-ray detectors, have been investigated. The metal-semiconductor structures were obtained by thermal (resistive) vacuum deposition of various metals onto detector-grade CdTe crystals. Metals with different work functions, such as Al, In, Ni, Ti, Cr, and Au, were employed as electrode materials for rectifying contacts. An ohmic contact was created on the entire opposite surface of the crystals by chemical deposition of Au from a gold chloride solution. The surface processing of CdTe crystals before the formation of both rectifying and ohmic contacts included mechanical and chemical polishing, as well as Ar-ion bombardment. Dark currents at reverse voltage of 1500 V did not exceed 4 nA for all the diodes except for the Au/CdTe/Au structure. The effect of the metal nature on the I-V characteristics and charge carrier transport mechanisms was studied, and the features of voltage dependences of dark current were explained by differences in the work functions of the metals, as well as the contact deposition technique.

Citation Download Citation

Valeriy Sklyarchuk, Volodymyr Gnatyuk, and Toru Aoki "Effect of the metal nature on the I-V characteristics of CdTe diodes for ionizing radiation detectors", Proc. SPIE 12696, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXV, 126960L (3 October 2023); https://doi.org/10.1117/12.2676538

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available