Photocurrent of lead tungstate (PbWO 4 ) single crystals has been studied in the temperature range from 4 K to 270 K. The excitation spectrum of the photocurrent characterized by a prominent peak at 4.1 eV and a rise above 4.5 eV was obtained at 270 K. Below 150 K, the photocurrents excited at 4.15 eV and 4.7 eV show analogous temperature dependence with each others. However, the photocurrent excited at 4.15 eV exhibits thermal activation type temperature dependence above 150 K. We find that the photocurrent showing thermal activation is induced efficiently by the excitation at 4.12 eV, but by neither the excitonic transition nor the band-to-band transition. The temperature dependence of the photocurrent is discussed in terms of temperature dependence of the mobility and the carrier density.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.