Photoconductivity and Non-Exponential Relaxation at Insulating LaAlO3/SrTiO3 Interfaces

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LaAlO{sub 3} is grown on SrO terminated (100) SrTiO{sub 3}, and (110) SrTiO{sub 3}, producing insulating heterointerfaces without light. Photocurrent spectroscopy at low temperatures reveals a broad distribution of interface states between 2 eV and 2.7 eV at both interfaces, with a higher density in the (110) case concomitant with relatively shallow traps. The photocurrent relaxation can be well fitted by a stretched exponential form, confirming energetically distributed electron traps. Photo-carrier lifetimes are larger than a few hundred seconds for optical excitation approaching the SrTiO{sub 3} band-gap energy, providing the opportunity to study transient light-induced properties at low temperatures.

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10 pages

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Kim, Minu; Bell, C.; Hikita, Y.; Kozuka, Y.; Kim, B.G. & Hwang, H.Y. August 17, 2012.

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LaAlO{sub 3} is grown on SrO terminated (100) SrTiO{sub 3}, and (110) SrTiO{sub 3}, producing insulating heterointerfaces without light. Photocurrent spectroscopy at low temperatures reveals a broad distribution of interface states between 2 eV and 2.7 eV at both interfaces, with a higher density in the (110) case concomitant with relatively shallow traps. The photocurrent relaxation can be well fitted by a stretched exponential form, confirming energetically distributed electron traps. Photo-carrier lifetimes are larger than a few hundred seconds for optical excitation approaching the SrTiO{sub 3} band-gap energy, providing the opportunity to study transient light-induced properties at low temperatures.

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10 pages

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  • Journal Name: Submitted to Solid State Communications

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  • Report No.: SLAC-PUB-15219
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1049747
  • Archival Resource Key: ark:/67531/metadc832029

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  • August 17, 2012

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  • May 19, 2016, 9:45 a.m.

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  • June 20, 2016, 9:11 p.m.

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Kim, Minu; Bell, C.; Hikita, Y.; Kozuka, Y.; Kim, B.G. & Hwang, H.Y. Photoconductivity and Non-Exponential Relaxation at Insulating LaAlO3/SrTiO3 Interfaces, article, August 17, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc832029/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.