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Issue 3, 2016
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Efficient eco-friendly inverted quantum dot sensitized solar cells

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Abstract

Recent progress in quantum dot (QD) sensitized solar cells has demonstrated the possibility of low-cost and efficient photovoltaics. However, the standard device structure based on n-type materials often suffers from slow hole injection rate, which may lead to unbalanced charge transport. We have fabricated efficient p-type (inverted) QD sensitized cells, which combine the advantages of conventional QD cells with p-type dye sensitized configurations. Moreover, p-type QD sensitized cells can be used in highly promising tandem configurations with n-type ones. QDs without toxic Cd and Pb elements and with improved absorption and stability were successfully deposited onto mesoporous NiO electrode showing good coverage and penetration according to morphological analysis. Detailed photophysical charge transfer studies showed that high hole injection rates (108 s−1) observed in such systems are comparable with electron injection in conventional n-type QD assemblies. Inverted solar cells fabricated with various QDs demonstrate excellent power conversion efficiencies of up to 1.25%, which is 4 times higher than the best values for previous inverted QD sensitized cells. Attempts to passivate the surface of the QDs show that traditional methods of reduction of recombination in the QD sensitized cells are not applicable to the inverted architectures.

Graphical abstract: Efficient eco-friendly inverted quantum dot sensitized solar cells

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Publication details

The article was received on 28 Aug 2015, accepted on 16 Nov 2015 and first published on 01 Dec 2015


Article type: Paper
DOI: 10.1039/C5TA06769C
Citation: J. Mater. Chem. A, 2016,4, 827-837
  • Open access: Creative Commons BY license
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    Efficient eco-friendly inverted quantum dot sensitized solar cells

    J. Park, M. T. Sajjad, P. Jouneau, A. Ruseckas, J. Faure-Vincent, I. D. W. Samuel, P. Reiss and D. Aldakov, J. Mater. Chem. A, 2016, 4, 827
    DOI: 10.1039/C5TA06769C

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