Electron transfer properties of organic dye-sensitized solar cells based on indoline sensitizers with ZnO nanoparticles

Abstract

Two indoline dyes, coded D149 and D205, were used as the sensitizers of ZnO dye-sensitized solar cells (DSCs) with optimal energy conversion efficiencies of more than 5%, under AM 1.5 full sunlight illumination (100 mW cm( - 2)). Higher interfacial charge transfer rate and retardant fluorescence decay confirmed from transient fluorescence illustrated that D205-sensitized ZnO DSCs could possess better electron transport than D149-sensitized ZnO DSCs. The enhancement of V(oc) and J(sc) for D205-sensitized ZnO DSCs was ascribed to the effective suppression of electron recombination by extending the alkyl chain on the terminal rhodanine moiety from ethyl to octyl. The evidence of enhanced electron diffusion coefficient was further shown by electrochemical impedance spectroscopy (EIS).

Electrodeposition of nanoporous ZnO on Al-doped ZnO leading to a highly organized structure for integration in Dye Sensitized Solar Cells

“…Further improvement of the transparency could allow to reach short circuit photocurrent up to 15 mA/cm 2 . Open circuit voltages are in the range of 600 mV and are slightly lower than value of 650 mV reported in the literature for D149 [39]. The same dye on TiO 2 could achieve a Voc of almost 700 mV [31].…”

Enhancement of Photosensitization Behavior of 1-(4-fluorophenyl)-2-(naphthalen-1-yl)-4, 5-diphenyl-1H-imidazole by Nanocrystalline ZnO

“…calcd. for C 31 Thus a glass like white gel is formed and is allowed to age overnight. It is filtered, washed with water as well as ethanol, dried using hot air oven for 10 hours at 110℃ and calcinated for 2 hours at 550℃ (heating rate 10°Cmin -1 ), thus resulting in the formation of pale grey solid.…”

“…As a result of lowering of energy level of FNDI, fluorescence enhancement is observed [31]. At certain times, strong adsorption of the FNDI on nanoparticle occurs due to the chemical affinity between the nitrogen atom of the imidazole and Zn ion over the metal oxide surface, which in turn results in enhancement [32].…”

Electron injection studies in TiO2 nanocrystalline films sensitized with fluorene dyes and photovoltaic characterization. The effect of co-adsorption of a bile acid derivative

“…Besides, the anchoring of the dyes to the semiconductor nanoparticles can modify the HOMO and LUMO levels compared to isolated dye [28]. In addition, the blue shift of the absorption spectra can indicate the formation of H-aggregates due to a parallel arrangement of the dye molecules [23,29,30].…”