Jump to main content
Jump to site search


P-type dye-sensitized solar cells based on pseudorotaxane mediated charge-transfer

Abstract

The efficiency of p-type dye-sensitized solar cells (DSSC) remains low compared to n-type congeners due to charge recombination events. We report a supramolecular approach to reduce recombination at the NiO–electrolyte interface, realized by using the cyclophane cyclobis(paraquat-p-phenylene) ring (RING4+/RING3●+) as a redox mediator and a dye (PN) functionalized with a 1,5-dioxynaphthalene (DNP) recognition site, promoting the supramolecular formation of a pseudorotaxane capable of directing charge transfer away from the dye–electrolyte interface. The binding affinity of RING4+ to PN is high (Kass = 3.4 × 104 M-1) with quenching of the photoexcited dye (PN*) ascribed to reduction of RING4+ to RING3●+. The reduced RING3●+ exhibits a lower binding affinity to PN facilitating exchange with the excess RING4+ present in solution. This supramolecular phenomenon was implemented into p-type DSSCs, by anchoring the PN dye on a NiO photocathode in conjunction with the RING4+/RING3●+ redox couple, yielding a 10 fold enhancement in short-circuit photocurrent (JSC) compared to control devices utilizing the P1 dye or methylviologen (MV2+/MV●+) redox couple that cannot form pseudorotxanes.

Back to tab navigation

Supplementary files

Publication details

The article was received on 07 Nov 2018, accepted on 23 Jan 2019 and first published on 23 Jan 2019


Article type: Paper
DOI: 10.1039/C8FD00169C
Citation: Faraday Discuss., 2019, Accepted Manuscript

  •   Request permissions

    P-type dye-sensitized solar cells based on pseudorotaxane mediated charge-transfer

    T. Bouwens, S. Mathew and J. N. H. Reek, Faraday Discuss., 2019, Accepted Manuscript , DOI: 10.1039/C8FD00169C

Search articles by author

Spotlight

Advertisements