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Photoconductivity of the EuO–KTO Interface: Effect of Intrinsic Carrier Density and Temperature

Manish Dumen, Ajit Singh, Saveena Goyal, ,

Abstract: In recent times, perovskite oxide based photovoltaic devices have attracted lots of attention. Here we report the effect of light illumination on the transport properties of a two-dimensional electron gas formed at the recently discovered conducting interface of EuO and KTaO3. We have seen that lowering the carrier density increases the photoresponse in this system. In room temperature the photoresponse consists of two processes. However, at low temperature it is not only governed by a single process; in addition, the response rate becomes several orders of magnitude faster. At the same time the magnitude of the photoresponse is also larger at low temperature. Our observation suggests an interplay between carrier and phonon dynamics determines the photoresponse and should be investigated theoretically in detail to design future photoresponsive cells.
Keywords: magnitude / photoresponse / EuO / low temperature / Carrier Density / times / recently discovered / discovered conducting

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