Room-Temperature Giant Persistent Photoconductivity in SrTiO3/LaAlO3 Heterostructures

详细信息    查看全文

• 作者：Antonello Tebano ; Emiliana Fabbri ; Daniele Pergolesi ; Giuseppe Balestrino ; Enrico Traversa
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：February 28, 2012
• 年：2012
• 卷：6
• 期：2
• 页码：1278-1283
• 全文大小：831K
• 年卷期：v.6,no.2(February 28, 2012)
• ISSN：1936-086X

文摘

SrTiO₃/LaAlO₃ 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 SrTiO₃/LaAlO₃ 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.

Keywords:

SrTiO₃/LaAlO₃ interfaces; persistent photocurrent; electrochemical impedance spectroscopy