Varying numbers and positions of carboxylate groups on Ru dyes for dye-sensitized solar cells: uptake on TiO₂, cell performance and cell stability

Abstract

Varying the number and position of carboxylate groups on Ru(ii) dyes affects the efficiency, dye uptake, dye binding and stability of dye-sensitised solar cells.

Isomer Dependence of Efficiency and Charge Recombination in Dye‐Sensitized Solar Cells Using Ru Complex Dyes Bearing Halogen Substituents

“…We have previously observed superior performance of similar Ru complex dyes bearing 3 or 4 anchoring carboxylates in comparison with 2 or 1. [25] With respect to the nature of the Y atom, it is clear that cells sensitised by dyes where Y = Cl had lower V OC than those sensitised by dyes where Y = Br (Table 3, Figure 4). Among all the cells, those sensitised by Ru(H 2 -dcbpy)(5,5Ј-F 2 -bpy)(NCS) 2 from the 5,5Ј series had the highest efficiency, suggesting that of the halides, the use of fluorine atoms is least detrimental in a DSSC.…”

Ruthenium and Osmium Complexes That Bear Functional Azolate Chelates for Dye‐Sensitized Solar Cells

“…Homoleptic [Ru(pzbp1) 2 ]w as next synthesized to reveal the positional effects of carboxya nchors on cell efficien- www.chemasianj.org cy. [12] Later on, independent DFT and time-dependent (TD) DFT calculations confirmed that both pyrazolate and thiocyanate are donor fragments that contributet ot he efficient charge transfer. [13] For comparison with pzbp1, ar elated tridentate chelate, pzbp2, was also synthesized with two 4,4'-disubstituted carboxy groups.…”

“…The main function of pzbp originates from its higher π conjugation and its capability to provide increased absorptivity in the visible region. Homoleptic [Ru(pzbp1) 2 ] was next synthesized to reveal the positional effects of carboxy anchors on cell efficiency 12. Later on, independent DFT and time‐dependent (TD) DFT calculations confirmed that both pyrazolate and thiocyanate are donor fragments that contribute to the efficient charge transfer 13…”

Synthesis, Structural Characterisation, and Spectroscopic Properties of Copper(I) Complexes and their Applications to Dye-Sensitised Solar Cells

“…The Cu-P and Cu-N bond lengths are 2.026(4)-2.102(4) and 2.151(2) Å , comparable with those in similar compounds. [37] Corresponding N-Cu-N bond angles range from 80.89(16) to 106.35 (14) Å , while the N-Cu-P bond angles range from 97.78 (11) to 144.90(10) Å . The CuÁÁÁCu separation of 8.253 Å is also shorter than the corresponding values in compound 1.…”

“…[7][8][9][10][11][12] DSSCs employing Ru II -based complexes as sensitisers have shown attractive conversion efficiencies, [13][14][15][16][17] but metallic ruthenium is highly expensive and is in short supply. [18] Copper (I) complexes have gained importance as alternatives to Ru II -based complexes in photophysical and photoelectrochemical applications, [19][20][21] especially because of their ease of synthesis and the high abundance of copper in comparison with metallic ruthenium.…”