Photovoltaic properties of MnGaInS$_{4}$ single crystals

The spectral distribution of photoconductivity and the temperature dependence of photocurrent in MnGaInS$_{4}$ single crystals have been investigated. Photoconductivity spectra demonstrate both intrinsic and impurity conductivity. In the case of manganese deficiency in crystals, an acceptor-type defect is seen in the wavelength range of 0.64–0.76 $\mu$m. The temperature dependence of the MnGaInS$_{4}$ single crystal bandgap is due to exciton–phonon interaction. In the temperature interval studied, photocurrent rises because of thermal depletion of trapping levels. The activation energy of trapping levels has been calculated.