title: Built-In Potential in Fe2O3-Cr2O3 Superlattices for Improved Photoexcited Carrier Separation.
abstract: Hematite (α-Fe2 O3) is engineered to improve photoexcited electron-hole pair separation by synthesizing Fe2O3-Cr2O3 superlattices (SLs) with precise atomic control. The different surface terminations exhibited by Fe2O3 and Cr2O3 determine the hetero-junction interface structure and result in controllable, noncommutative band offset values. This controllable band alignment is harnessed to generate a built-in potential as large as 0.8 eV in Fe2 O3-Cr2O3 SLs.
authors.affiliation: Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99354, USA.
authors.forename: Tiffany C
authors.initials: TC
authors.lastname: Kaspar
authors.affiliation: Energy and Environment Directorate, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99354, USA.
authors.forename: Daniel K
authors.initials: DK
authors.lastname: Schreiber
authors.affiliation: Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99354, USA.
authors.forename: Steven R
authors.initials: SR
authors.lastname: Spurgeon
authors.affiliation: Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99354, USA.
authors.forename: Martin E
authors.initials: ME
authors.lastname: McBriarty
authors.affiliation: Department of Chemistry, University of Washington, P.O. Box 1700, Seattle, WA, 98195-1700, USA.
authors.forename: Gerard M
authors.initials: GM
authors.lastname: Carroll
authors.affiliation: Department of Chemistry, University of Washington, P.O. Box 1700, Seattle, WA, 98195-1700, USA.
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Gamelin
authors.affiliation: Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99354, USA.
authors.forename: Scott A
authors.initials: SA
authors.lastname: Chambers
keywords: X-ray photoelectron spectroscopy; hematite; photoconductivity; potential; superlattices