Preparation and properties of dye-sensitized solar cell using chlorophyll derivative immobilized TiO_2 film electrode

摘要

A dye-sensitized solar cell using the visible light sensitization of chlorophyll-a derivative, chlorine-e_6 (Chl-e_6) immobilized on TiO_2 film was developed. From fluorescence spectrum of Chl-e_6 immobilized on TiO_2 film, the emission of Chl-e6 was effectively quenched by TiO_2, indicating that the effective electron injection from the excited singlet state of Chl-e_6 into the conduction band of TiO2 occurred. The short-circuit photocurrent density (I_(SC)), the open-circuit photovoltage (V_(OC)), and the fill factor (FF) of solar cell consisting of Chl-e_6 immobilized on TiO2 film electrode and platinum-coated substrate electrode were estimated to be 1.47 mA cm~(-2), 425 mV, and 57.0%, respectively. IPCE values were reached a maximum around the wavelength of absorption maximum (11.0% at 400 nm, 4.7% at 541 nm and 7.9% at 661 nm), indicating that the dye-sensitized solar cell using visible light sensitization of TiO_2 film by Chl-e_6 was developed.