Tuning the photovoltaic parameters of β-substituted porphyrin analogues: An experimental and theoretical approach

D–π–A structured porphyrins for efficient dye-sensitized solar cells

“…The sensitizers LW1, LW2, and LW3 and their precursor compounds are highly soluble in aromatic solvents (i.e., toluene and tetrahydrofuran) and other common organic solvents. The structure and purity of the newly synthesized compounds were fully conrmed by 1 HNMR, 13 CNMR, and mass spectroscopy (see Fig. S1-S9 †) which are found to be in good agreement with their structure.…”

“…11 These efficient sensitizers show relatively weak light-harvesting ability in the near-IR region, especially beyond 750 nm, which limits the photocurrent under full spectrum solar ux. [12][13][14] As an electron spacer to connect the donor and acceptor, the p-linker determines not only the light-harvesting characteristics of the chromophore, but also the electron injection from the excited dyes to the TiO 2 surface, accompanied by electron donor and acceptor moieties. [15][16][17][18][19][20][21][22][23] To date, the design of sensitizers with good photovoltaic properties has focused primarily on engineering (i) the electronic nature of the D and A moieties and (ii) the conjugation of the p-linker.…”

Kinetics versus Energetics in Dye-Sensitized Solar Cells Based on an Ethynyl-Linked Porphyrin Heterodimer

“…Therefore, in order to achieve comparable or improved photovoltaic performances, the alternative should be able to either greatly elevate the TiO 2 conduction band edge or effectively passivate the TiO 2 /I 3 – interface. Guanidinium thiocyanate (GuNCS) is a popular coadsorbent for high-efficiency dye-sensitized solar cells. ,,,, It is generally accepted that employment of GuNCS results in a positively shifted conduction band edge and passivated TiO 2 /I 3 – . , However, it has been seldom applied in porphyrin-sensitized solar cells except a few recent reports. ,− In this study, GuNCS was used in one type of TBP-free electrolyte containing 25 mM I 2 , 0.7 M DMPII, and 0.1 M GuNCS in acetonitrile, coded as electrolyte III. In comparison, two other TBP-free electrolyte were also checked, with electrolyte I containing 0.1 M LiI, 25 mM I 2 , 0.6 M DMPII in acetonitrile and electrolyte II containing 25 mM I 2 and 0.7 M DMPII in acetonitrile.…”

Steric and Solvent Effect in Dye-Sensitized Solar Cells Utilizing Phenothiazine-Based Dyes

“…The device performance of PT1-3 dyes indicates that the devices using EtOH show a higher sc and a significantly higher oc than those obtained using THF, with a higher light conversion efficiency of PT3 dye compared with those of PT2 and PT1. The reasons for this inferior performance for the dyes using THF solution as mentioned before would be attributed to the smaller amount of adsorbed dye in the TiO 2 semiconductor due to the propensity of dye molecules to exist more in THF solvent rather than to get adsorbed and also due to the hydrogen bond interaction of the oxygen of the tetrahydrofuran and the hydrogen of the carboxylic acid of the dyes [40,41]. Meanwhile, it was also noted that dyes with more branched alkyl groups show higher oc and sc in both EtOH and THF dye-bath solvent.…”