Dye-sensitized solar cells based on multichromophoric supramolecular light-harvesting materials

Abstract

Multichromophoric dye-sensitized solar cells (DSSCs) comprised of a supramolecular zinc-phthalocyanineperyleneimide (ZnPc···PMI) dyad convert light to electrical energy with much higher power conversion efficiency (PCE = 2.3%) and incident-photon-to-current-efficiency (IPCE = ca. 40%) than the devices made of individual dyes.

A conformationally stressed novel ball-type perylenediimide appended zinc(ii)phthalocyanine hybrid: spectroelectrochemical, electrocolorimetric and photovoltaic properties

“…The compound is thermally stable above 400 30 °C, and almost insoluble in common organic solvents, but significantly soluble in coordinating solvents such as DMSO, DMF and pyridine, and no significant metal-ligand interactions are expected due to closed-shell d 10 The first direct evidence for the synthesis of 6 is provided by FT-IR which shows complete disappearance of the cyano stretching at 2232 cm -1 observed in the precursor 5. The experimental and calculated FT-IR spectra are almost identical showing the same 40 pattern of absorption (ESI †, Fig. S8).…”

“…The key factors in determining the performance of a solar cell are 40 to measure the current density as a function of the voltage across the cell and determine the performance parameters such as, short circuit current (I SC ), open circuit voltage (V OC ), fill factor (FF) and photovoltaic conversion efficiency (η) under particular illumination conditions, so called the standard test conditions 36 . 45 The photovoltaic conversion efficiency of a solar cell is defined as,…”

“…In the past few years, we have directed our attention to the construction of balltype Pcs which are a new class of Pcs with additional π-extended conjugation, [6][7][8][9] in addition to their different and interesting 35 electrical, electrochemical, electrocatalytic, gas sensing and optical properties in comparison to their parent monomers, as detected by spectroscopic, electrochemical and in situ spectroelectrochemical measurements. 8,10 On the other hand, perylene diimides (PDI) 11,12 have also been successfully proven 40 to be among the most significant electron acceptors due to their stability, the intense light absorption, rich redox chemistry, and high charge-carrier mobilities, which can be modulated as a function of the substitution pattern. 13 More recently, covalent systems based on PDI covalently 45 linked to one or two Pc units have also been reported.…”

“…The S1 transition at 760 nm shown as an inset in the figure originates from HOMO → LUMO transition presented in the Table (ESI †, Table S1). This transition is very weak, with oscillator strength of 0.0007, 40 being certainly very difficult to observed experimentally. The comparison of the UV/Vis spectra of the hybrid 6 with the corresponding precursor 5 and the unsubstituted ZnPc (Fig.…”

Improvement in photovoltaic performance of perovskite solar cells by interface modification and co-sensitization with novel asymmetry 7-coumarinoxy-4-methyltetrasubstituted metallophthalocyanines

“…Phthalocyanines (Pcs) are well known chromophores for their intense absorption in theUV/blue (Soret-band) and the red/near IR (Q-band) spectral regions, as well as for their excellent electrochemical, photochemical and thermal stability [12]. Moreover, Pcs have appropriate redox properties for the sensitization of wide bandgap semiconductors such as TiO 2 , therefore rendering them attractive as sensitizers for DSSCs [13][14][15][16][17][18][19]. Over the years, the PCE of Pc-based DSSC has improved to 6.4% using PcS20 [20] by synthesizing various Pc derivatives and optimizing fabrication process.…”