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

Jon M. Azpiroz*, Jesus M. Ugalde, Lioz Etgar, Ivan Infante, Filippo De Angelis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

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 TiO2oxide 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 TiO2more 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.

Original languageAmerican English
Pages (from-to)6076-6086
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume17
Issue number8
DOIs
StatePublished - Feb 2015

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