Improved efficiency of PbS quantum dot sensitized NiO photocathodes with naphthalene diimide electron acceptor bound to the surface of the nanocrystals

Journal article


Raissi, Mahfoudh, Sajjad, T, Farré, Yoann, Roland, Thomas J, Ruseckas, Arvydas, Samuel, Ifor DW and Odobel, Fabrice (2018). Improved efficiency of PbS quantum dot sensitized NiO photocathodes with naphthalene diimide electron acceptor bound to the surface of the nanocrystals. Solar Energy Materials and Solar Cells. 181, pp. 71-76. https://doi.org/10.1016/j.solmat.2017.12.029
AuthorsRaissi, Mahfoudh, Sajjad, T, Farré, Yoann, Roland, Thomas J, Ruseckas, Arvydas, Samuel, Ifor DW and Odobel, Fabrice
Abstract

Hybrid materials combining a wide bandgap metal oxide semiconductor, metal chalcogenide nanocrystals and molecular systems represent very attractive materials for fabricating devices with new function or improved photoelectrochemical performance. This study deals with sensitization of NiO, which is a p-type semiconductor, by quantum dots (QDs) of PbS with an average diameter of 3 nm. The PbS QDs were attached to the monocrystalline film of NiO by mercaptopropionic acid linker and were subsequently capped with methyl-pyridine naphthalene diimide (NDI) units to prepare quantum dot sensitized solar cells (p-QDSSCs) on NiO electrodes. Time-resolved photoluminescence measurements of the PbS emission were used to determine the rate constants for charge transfer from the PbS exciton to the NiO, cobalt based redox mediator and NDI. Notably, it was shown that NDI quenches the PbS exciton by electron transfer with a quite fast rate constant (6.9 × 107 s−1). The PbS QDs sensitized NiO films were finally used to fabricate solar cells with tris(4,4′-ditert-butyl-2,2′-bipyridine) cobalt(III/II) as redox mediator. It was observed that the presence of NDI on PbS improved the photovoltaic performance by 50% relative to that of cells without NDI, leading to a device with the following characteristics: Jsc = 5.75 mA/cm2, Voc = 226 mV, ff = 34% and PCE = 0.44%. This study demonstrates that photogalvanic processes can be a productive pathway to better performing sensitized p-type semiconductor for p-QDSSC. In other words, photoinduced electron transfer from the QDs towards the electrolyte rather than initial photoinduced charge injection into the p-type semiconductor can be a favorable operative mechanism in QD sensitized NiO films and might be exploited further for the construction of better performing solar cells or photocatalytic devices.

Year2018
JournalSolar Energy Materials and Solar Cells
Journal citation181, pp. 71-76
PublisherNorth-Holland
ISSN0927-0248
Digital Object Identifier (DOI)https://doi.org/10.1016/j.solmat.2017.12.029
Publication dates
Print01 Jul 2018
Online11 Jan 2018
Publication process dates
Accepted19 Dec 2017
Deposited12 Feb 2020
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