Built-In Potential in Fe2O3-Cr2O3 Superlattices for Improved Photoexcited Carrier Separation

Built-In Potential in Fe2O3-Cr2O3 Superlattices for Improved Photoexcited Carrier Separation

Hematite (α‐Fe2O3) 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 hetero­junction interface structure and result in controll...

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Veröffentlicht in:Advanced materials (Weinheim) 2016-02, Vol.28 (8), p.1616-1622
Hauptverfasser: Kaspar, Tiffany C., Schreiber, Daniel K., Spurgeon, Steven R., McBriarty, Martin E., Carroll, Gerard M., Gamelin, Daniel R., Chambers, Scott A.
Format: Artikel
Sprache:eng
Schlagworte:
hematite
photoconductivity
potential
superlattices
X-ray photoelectron spectroscopy
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Zusammenfassung:Hematite (α‐Fe2O3) 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 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 Fe2O3‐Cr2O3 SLs.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201504545