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phonic acid-functionalized anchoring ligands with asymmetric ancillary ligands in bis ( diimine ) copper ( I ) dyes for dye-sensitized solar cells †
| Content Provider | Semantic Scholar |
|---|---|
| Author | Büttner, Annika Brauchli, Sven Y. Vogt, Raphael Constable, Edwin C. Housecroft, Catherine E. |
| Copyright Year | 2016 |
| Abstract | A ‘surfaces-as-ligands’ strategy is used to assemble heteroleptic copper(I) dyes [Cu(Lanchor)(Lancillary)] + on FTO/ TiO2 electrodes for dye-sensitized solar cells (DSCs). The anchoring domain, Lanchor, is either ((6,60-diphenyl[2,20-bipyridine]-4,40-diyl)bis(4,1-phenylene))bis(phosphonic acid) (1) or ((6,60-dimethyl-[2,20-bipyridine]4,40-diyl)bis(4,1-phenylene))bis(phosphonic acid) (2). Asymmetric ancillary ligands with a 2,20-bipyridine metal-binding domain are used to counter the sterically-demanding 6,60-diphenyl-substitution pattern in anchor 1; Lancillary 1⁄4 6-methyl-4-phenyl-2,20-bipyridine (3), 6-methyl-4-(4-bromophenyl)-2,20-bipyridine (4), 6-methyl-4-(4-methoxyphenyl)-2,20-bipyridine (5) or 6-methyl-4-(3,4,5-trimethoxyphenyl)-2,20bipyridine (6). Solid-state absorption spectra of adsorbed [Cu(1)(Lancillary)] + and [Cu(2)(Lancillary)] , and external quantum efficiency (EQE) spectra of DSCs containing these dyes confirm that incorporation of 6,60-diphenyl-substituted 1 leads to a broadened spectral response at lower energies compared to dyes with anchor 2; dye-loading is higher for [Cu(2)(Lancillary)] + than for [Cu(1)(Lancillary)] , and EQEmax is >41% for [Cu(2)(Lancillary)] + compared to <12% for [Cu(1)(Lancillary)] . Enhanced values of the short-circuit current density (JSC) are observed on going from anchor 1 to 2, independent of Lancillary. For the series of [Cu(2)(Lancillary)] + dyes, photoconversion efficiencies (confirmed using four DSCs per dye) vary with Lancillary in the order 3 5 > 6 > 4 on the day of DSC assembly, and 5 > 3 6 > 4 after a week. The best performing DSCs achieve efficiencies of 37% relative to N719 set at 100%. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://pubs.rsc.org/en/content/articlepdf/2016/ra/c5ra25447g?page=search |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
