Ohmic contacts to cadmium telluride

Abstract

The problem of manufacturing good ohmic contacts onto cadmium telluride (CdTe) served as a motivation for this study. The accuracy and reliability of the method used to calculate the specific contact resistance of ohmic contacts, will determine the success of any comparison involving different surface preparation and contact manufacturing procedures. The main objective of this study was therefore to review the different methods most frequently used for determining the specific contact resistance, r c' and to evaluate their applicability to ohmic contacts on CdTe. Most of the existing methods are designed for characterizing very good ohmic contacts. The method proposed in this study is recommended to characterize poor to moderate ohmic contacts, which is the case with ohmic contacts on CdTe.