Investigation of Band Offsets of Interface BiOCI: Bi2 WO6: A First-Principles Study
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Density functional theory calculations are performed to study the band offsets at the interface of two photocatalytic materials BiOCl:Bi 2WO 6. It is found that the W-O bonded interface shows the most stability. An intrinsic interface fails to enhance the charge-carrier separation due to the improper band alignment between these two materials. Sulfur (S) is proposed to replace the bulk oxygen (O) site and thus tune the band edges of BiOCl to enhance the photocatalytic performance of the heterojunction. Furthermore, the presence of S provides an extra charge to generate a clean interface with minimal gap states that also benefits carrier migration across the heterojunction. © 2012 the Owner Societies.
"This work is supported by the National Natural Science Foundation of China (11004068) and PCSIRT (Program for Changjiang Scholars and Innovative Research Team in University) and Program for New Century Excellent Talents in University (NCET). D.W. Zeng would like to acknowledge the support from the National Basic Research Program of China (Grant No. 2009CB939705 and 2009CB939702).