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Issue 36, 2015
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The nature of photogenerated charge separation among different crystal facets of BiVO4 studied by density functional theory

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Abstract

Charge separation among different crystal facets of a semiconductor has been observed experimentally, but the underlying reasons behind this phenomenon are unknown. In this work, the activation energies of carrier hopping and the mobility of electron/hole transport along seven low-index crystal orientations of bulk BiVO4 have been calculated using a small polaron model. The calculated mobility and our previous experimental results reveal that there is a parallel relationship between the carrier mobility along the crystal axis and the carrier preferred accumulation on the corresponding crystal facets. It is proposed that the mobility of electrons (or holes) along the crystal axis [hkl] might be essentially related to the charge separation among the indices of corresponding facets (hkl); namely, the mobility of electrons (or holes) along the crystal axis [hkl] is the largest among all possible crystal axes, and the photogenerated electrons (or holes) tend to be accumulated on the indices of the corresponding facet (hkl) when the surface factors like surface band bending, surface energetic differences, etc. are not considered.

Graphical abstract: The nature of photogenerated charge separation among different crystal facets of BiVO4 studied by density functional theory

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Publication details

The article was received on 22 Jul 2015, accepted on 06 Aug 2015 and first published on 07 Aug 2015


Article type: Paper
DOI: 10.1039/C5CP04299B
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Citation: Phys. Chem. Chem. Phys., 2015,17, 23503-23510
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    The nature of photogenerated charge separation among different crystal facets of BiVO4 studied by density functional theory

    T. Liu, X. Zhou, M. Dupuis and C. Li, Phys. Chem. Chem. Phys., 2015, 17, 23503
    DOI: 10.1039/C5CP04299B

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