Abstract

The temperature variation of electrical conductivity of Cu2ZnSnS4 (CZTS) films in the dark and under light has been studied in the temperature range of 350–500 K. CZTS films were deposited on glass substrates by doctor-blade printing from microwave-processed nanoparticle ink. X-ray diffraction and Raman spectroscopy confirm the formation of kesterite CZTS. Thermoelectric measurements show the films are basically p-type. The electrical conductivity of CZTS films increases with temperature and it is found to be thermally activated. An analysis of the temperature variation of dark and illuminated conductivity reveals that the transport of holes in these films is due to the thermionic emission over grain boundary barriers. The films are photoconducting in nature. Under illumination, the grain boundary barrier height of these films decreases due to photogenerated charge carriers.

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