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Built‐In Potential in Fe 2 O 3 ‐Cr 2 O 3 Superlattices for Improved Photoexcited Carrier Separation
Author(s) -
Kaspar Tiffany C.,
Schreiber Daniel K.,
Spurgeon Steven R.,
McBriarty Martin E.,
Carroll Gerard M.,
Gamelin Daniel R.,
Chambers Scott A.
Publication year - 2016
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201504545
Subject(s) - superlattice , materials science , offset (computer science) , band offset , nanotechnology , computer science , optoelectronics , band gap , valence band , programming language
Hematite (α‐Fe 2 O 3 ) is engineered to improve photoexcited electron–hole pair separation by synthesizing Fe 2 O 3 ‐Cr 2 O 3 superlattices (SLs) with precise atomic control. The different surface terminations exhibited by Fe 2 O 3 and Cr 2 O 3 determine the heterojunction 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 Fe 2 O 3 ‐Cr 2 O 3 SLs.