Magnetic semiconductor thin films of CdCr2−2xIn2xSe4 photoconductivity

Abstract Thin films of CdCr 2−2 x In 2 x Se 4 have potential use as detectors, the maximum of photoconductivity is within the wavelength from 680 to 840 nm. It is a soft magnetic material; CdCr 2 Se 4 : In has the reentrant transition, CdCr 2−2 x In 2 x Se 4 is in the spin-glass state. The spectral characteristics of photoconductivity are affected by the dilution level. The samples were obtained by RF sputtering technique. For the investigated samples the energy gap was found to change from 1.5 to 1.8 eV. The photoconductivity is presented by voltage sensitivity ( R v ) and was measured as a function of wavelength using chopped (100 Hz–3.9 kHz) light source and selective voltmeter. It was found that the maximum of R v is shifted towards the infrared region when dilution level is reduced.