A β-Diketonato Ruthenium(II) Complex with High Molar Extinction Coefficient for Panchromatic Sensitization of Nanocrystalline TiO₂Film

Abstract

A dye-sensitized solar cell (DSC) was fabricated using a new β-diketonato ruthenium(II) sensitizer with a broad absorption range and a high molar extinction coefficient of 11.3×103 M-1 cm-1 at 584 nm. Efficient sensitization of nanocrystalline TiO2 film was observed across the whole visible range and into the near-IR region as far as 1000 nm. The incident photon-to-current conversion efficiency (IPCE) spectrum was consistent with the absorption spectrum and resulted in a high short-circuit photocurrent density (Jsc) of 19 mA cm-2.

Tuning of spectral response by co-sensitization in black-dye based dye-sensitized solar cell

“…Under similar fabrication conditions Ru polypyridine complexes (black bye) as sensitizer, and an organic electrolyte containing I − /I 3 − as a hole transporting material showed an efficiency over 11% . One of the very important requirements for the enhancement of photoconversion efficiency of DSSC is the absorption of photon in wide wavelength region . Unfortunately, most of the Ru complexes exhibit narrow absorption band or have weak light harvesting ability in particular solar spectrum region.…”

Synthesis and Application of New Ruthenium Complexes Containingβ-Diketonato Ligands as Sensitizers for Nanocrystalline TiO2Solar Cells

“…We have reported a series of ruthenium polypyridyl complexes where the LUMO energy level of the sensitizer is systematically tuned, and we show that a sensitizer should possess excited-state oxidation potential of −0.8 V versus SCE for efficient charge injection [11][12][13][14][15][16][17]. So far, terpyridine ruthenium(II) complex having one triphenylamine-substituted β-diketonato chelating ligand exhibits a broad absorption spectrum covering the visible and near-IR regions and a high molar extinction coefficient [14]. However, there is no report of systematic tuning of the HOMO energy level to elucidate the threshold ground-state redox potential for efficient dye regeneration.…”

Tuning the Electrical and Optical Properties of Diketopyrrolopyrrole Complexes for Panchromatic Dye‐Sensitized Solar Cells

“…The DSC devices were fabricated according to a literature procedure. [24] A main transparent layer (12 mm) with titania particles (about 20 nm) and a scattering layer (4 mm) with titania particles (about 400 nm) were screen-printed onto the fluorine-doped tin oxide (FTO)-conducting glass substrate. The films were then sintered at 500 8C for 1 h. The thickness of the films was measured on a Surfcom 1400A surface profiler (Tokyo Seimitsu Co. Ltd.).…”