Preparation of CuAlO2 and CuCrO2 thin films by sol–gel processing

CuAlO2 and CuCrO2 thin films were prepared by sol–gel processing and subsequent thermal treatment in air and inert gas atmosphere. Resistivities of 700 Ω cm and 60 Ω cm with optical transmissions of 65% and 32% were achieved respectively. The crystallization temperature of 700 °C allows the preparation of CuCrO2 on borosilicate glass. P-type conductivity was verified by Seebeck measurements and a transparent heterostructure including p-CuCrO2 showed rectifying behavior.