Improved molecular architecture of D–π–A carbazole dyes: 9% PCE with a cobalt redox shuttle in dye sensitized solar cells

Abstract

DSSCs with >9% PCE based on a new D–π–A dye (SK3) having carbazole as a donor, vinylene-phenylene (π-bridge) and cyanoacrylic acid as electron withdrawing–injecting as well as anchoring groups are reported.

Biphenyl‐Amine‐Based D‐π‐A’‐π‐A Sensitizers for DSSCs: Comparative Photo‐Conversion Efficiency in Iodide/triiodide and Cobalt‐Based Redox Electrolyte and DFT Study

“…J‐ aggregation, unlike it is beneficially responsible for the longer wavelength red shifting . Surprisingly, the red shifting and absorbance observed in adsorbed MMR1 is higher compare to the MMR2 , which may cause higher aggregation due to cyanoacrylic acid as anchoring group …”

“…Thus, the trend in the photon light‐to‐current conversion efficiency is observed as MMR1 > MMR2 . The lower performance of MMR2 is associated with the lower molar extinction coefficient values observed and the week acceptor/anchoring nature of the rhodanine‐3‐acetic acid group, which results in lowering of J sc value and in turn leads to poor device performance . Along with this, the charge recombination processes also affect the low current generation from the MMR2 device.…”

The molecular engineering, synthesis and photovoltaic studies of a novel highly efficient Ru(ii) complex incorporating a bulky TPA ancillary ligand for DSSCs: donorversusπ-spacer effects

“…6a, a higher frequency of the semicircle relates to the series ohmic resistance (R S ), whereas the high-frequency region gives the interface capacitance (C Pt ) and charge transport resistance (R Pt ) at the counter electrode/ The bigger the radius of the semicircle, the higher the charge recombination resistance from TiO 2 to the I 3 À /I À electrolyte will be. 37,38 However, a decrease in the radius of the semicircle was observed in the order of MH-12 > MH-13 > IA-7. This trend demonstrates that the recombination at the TiO 2 /dye/electrolyte interface is IA-7 > MH-13 > MH-12, and the high recombination resistance of IA-7 compared to the other reported dyes enhances electron injection into the mesoporous TiO 2 nanoparticles and so increases the overall efficiency of DSSCs.…”

A Smart Flexible Solid State Photovoltaic Device with Interfacial Cooling Recovery Feature through Thermoreversible Polymer Gel Electrolyte

“…PET‐ITO flexible conductor (surface resistivity 20 Ω cm −2 ) and Meltonix tape were purchased from Solaronix, SA, Switzerland. SK3 metal free sensitizer was prepared based on method used in an earlier study . Conc.…”

“…The deposited TiO 2 layer possesses a highly porous structure and the same is confirmed from the scanning electron microscopy (SEM) image of TiO 2 deposited on the ITO electrode (Figure S4, Supporting Information). TiO 2 layer is sensitized with hydrophobic SK3 metal‐free carbazole dye which is synthesized based on our earlier report . The chemical structure and UV–vis spectra of SK3 dye are provided in Figure S5 (Supporting Information).…”