电沉积制备TiO2薄膜及其光电性能研究

PREPARATION OF TiO_2 THIN FILMS BY ELECTRODEPOSITING AND THEIR PHOTOVOLTAIC PROPERTIES

采用阴极电沉积在导电玻璃上制备TiO_2薄膜,作为光阳极组装染料敏化太阳电池(DSSC)。通过TG-DTG、XRD、SEM、EIS和I-V曲线研究TiO_2的结构形貌和生成历程及其在DSSC中的光电性能。结果表明:电沉积薄膜是非晶态Ti(OH)_3,经过热处理后得到TiO_2薄膜,薄膜颗粒大小均匀。TiO_2薄膜组装的DSSC比其他价态钛的氧化物表现出较好的光电性能,主要是因为TiO_2/染料/电解液界面的电荷转移电阻最小。

TiO2 thin films were deposited on the conductive glass substrate by cathodic electrodepositing and their performances as the photoanodes of dye-sensitized solar cells （DSSCs） were investigated. The structure, surface morphology, generation process and photovohaic property of the TiO： thin films were characterized by thermal analysis （TG-DTG）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, electrochemical impedance spectra （EIS） and current-voltage curve （I-V）. The results showed that Ti （OH）3 thin films prepared by electrodepositing on FTO are amorphous and uniform, and the last sample by heat treatment is TiO2. TiO2 thin films in DSSC have best photovoltaic properties than other titanium oxide, because the charge transfer impedance of TiO2/dye/electrolyte interface is least.