title: A study of the impact of co-adsorbents on DSSC electron transfer processes: anti-π-stacking vs. shield effect.
abstract: In this study we report a detailed exploration of the use of two different co-adsorbents - namely bis-methoxyphenylphosphinic acid (BMPP) and chenodeoxycholic acid (CDCA) - known to increase photoconversion efficiency (PCE) of DSSCs sensitized with N719. We have explored the variation of their abilities with the [co-ads]/[D] ratio of the sensitization bath in order to lower the intermolecular deactivations (anti-π-stacking effect) and recombinations between photo-injected electrons and the oxidized mediator (shield effect). EIS-λ technique has been used for this purpose, allowing the two effects considered here to be accurately quantified. DSSC containing BMPP allowed to improve the cell PCE by 60% with a ratio [co-ads]/[D] = 1, exhibiting a strong shield effect, while the maximum PCE obtained with CDCA was slightly over 7% (corresponding to 30% improvement) with a ratio [co-ads]/[D] = 10 and exhibiting a strong anti-π-stacking effect.
authors.affiliation: iS2-SAS, 10, Place de l'Hôtel de Ville, 57260, Dieuze, France.
authors.forename: R
authors.initials: R
authors.lastname: Cisneros
authors.forename: M
authors.initials: M
authors.lastname: Beley
authors.forename: F
authors.initials: F
authors.lastname: Lapicque