CNR-SPIN and Dipartimento di Informatica Sistemi e Produzione, University of Roma Tor Vergata, Rome, Italy.
ACS Nano. 2012 Feb 28;6(2):1278-83. doi: 10.1021/nn203991q. Epub 2012 Jan 25.
SrTiO(3)/LaAlO(3) interfaces show an unprecedented photoconductivity effect that is persistent even at room temperature and giant as it gives rise to a conductivity increase of about 5 orders of magnitude at room temperature. The persistent photoconductivity effects play a paramount role in the still controversial intrinsic behavior of the SrTiO(3)/LaAlO(3) interfaces, as even a limited exposure to visible light is able to strongly modify the electrical transport properties of the interface even above room temperature, while only an appropriate thermal treatment in a dark environment can completely suppress the persistent photoconductivity effect unveiling the intrinsic conduction mechanism of the interface. Moreover, our study demonstrates that the origin of the high conductivity, revealed at the STO/LAO interface at room temperature, is purely electronic.
SrTiO(3)/LaAlO(3) 界面表现出一种前所未有的光电导效应，即使在室温下也能持续存在，而且非常显著，因为它在室温下导致了约 5 个数量级的电导率增加。持久光电导效应在 SrTiO(3)/LaAlO(3) 界面的仍有争议的固有行为中起着至关重要的作用，因为即使是有限的可见光照射也能够强烈地改变界面的电输运性质，甚至在室温以上，而只有在黑暗环境中的适当热处理才能完全抑制持久光电导效应，揭示界面的固有传导机制。此外，我们的研究表明，在室温下 STO/LAO 界面上揭示的高电导率的起源是纯粹的电子性质。
