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Issue 8, 2015
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The effect of TiO2 surface on the electron injection efficiency in PbS quantum dot solar cells: a first-principles study

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Abstract

We present a density functional theory (DFT) study aimed at understanding the injection and recombination processes that occur at the interface between PbS QDs and TiO2 oxide nanoparticles with different morphologies. The calculated injection rates fall in the picosecond timescale in good agreement with the experiments. In addition, our simulations show that the (101) facet of TiO2 more favourably accommodates the QD, resulting in stronger electronic couplings and faster electron injections than the (001) surfaces. Despite this, the (101) slab is also more prone to faster electron recombination with the valence band of the QD, which can lead to overall lower injection efficiencies than the (001) surface.

Graphical abstract: The effect of TiO2 surface on the electron injection efficiency in PbS quantum dot solar cells: a first-principles study

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Publication details

The article was received on 29 Oct 2014, accepted on 13 Jan 2015 and first published on 13 Jan 2015


Article type: Paper
DOI: 10.1039/C4CP04976D
Author version available: Download Author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2015,17, 6076-6086
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    The effect of TiO2 surface on the electron injection efficiency in PbS quantum dot solar cells: a first-principles study

    J. M. Azpiroz, J. M. Ugalde, L. Etgar, I. Infante and F. De Angelis, Phys. Chem. Chem. Phys., 2015, 17, 6076
    DOI: 10.1039/C4CP04976D

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