Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 27, Issue 53, Pages 13306-13317Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202101764
Keywords
band gaps; band offsets; density functional calculations; heterojunctions; photocatalysis
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Funding
- Italian Ministry of University and Research (MIUR) [20179337R7 MULTI-e]
- grant Dipartimenti di Eccellenza - 2017 Materials For Energy
- CINECA under the ISCRAB initiatives
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Electronic structure calculations play an increasingly important role in driving the design and preparation of new interfaces with desired properties, addressing methodological and practical problems in semiconductor heterojunctions at the level of density functional theory.
Electronic structure calculations provide a useful complement to experimental characterization tools in the atomic-scale design of semiconductor heterojunctions for photocatalysis. The band alignment of the heterojunction is of fundamental importance to achieve an efficient charge carrier separation, so as to reduce electron/hole recombination and improve photoactivity. The accurate prediction of the offsets of valence and conduction bands in the constituent units is thus of key importance but poses several methodological and practical problems. In this Minireview we address some of these problems by considering selected examples of binary and ternary semiconductor heterojunctions and how these are determined at the level of density functional theory (DFT). The atomically precise description of the interface, the consequent charge polarization, the role of quantum confinement, the possibility to use facet engineering to determine a specific band alignment, are among the effects discussed, with particular attention to pros and cons of each one of these aspects. This analysis shows the increasingly important role of accurate electronic structure calculations to drive the design and the preparation of new interfaces with desired properties.
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