ELECTROPHYSICAL PROPERTIES OF CdS LAERS OBTAINED BY PULVERIZATION METHOD AND ANNEALED IN HIDROGEN AMBIANCE

Vasile BOTNARIUC, Leonid GORCEAC, Andrei COVAL, Boris CINIC, Petru CHETRUŞ, Semion RAEVSCHI, Semion BANU Universitatea de Stat din Moldova

Abstract

CdS layers were grown from the aqueous solution of CdCl2/(NH2)2 CS having a molarity of 0,1M by pulverization method in the temperature range of (250...450)°C. The layers were heat treated in a hydrogen flow during 20 min at the temperatures of 350°C and 450°C. Electro- physical properties and photoluminescence of these layers were studied. For the layers deposited at 450°C a slight decrease of charge carriers concentration is observed with the increase of treatment temperature up to 450°C. The photoluminescence spectrum consists of a large band in the energy interval from 1,6 eV to 2,6 eV. A photoluminescence peak with the energy of 1,95 eV is observed, which is shifting with CdS layer growth temperature increase and if reaches the value of 2,5 eV for the layers grown at the temperature of 450°C. Keywords: CdS layers, morphology, atomic weight, electrical and photoluminescence properties.