色素敏化染料
电泳沉积
介电谱
材料科学
能量转换效率
带隙
开路电压
透射率
复合数
化学工程
光电子学
薄膜
太阳能电池
退火(玻璃)
短路
纳米技术
电化学
电极
复合材料
化学
电解质
电压
电气工程
涂层
物理化学
工程类
作者
John Nguu,Francis Nyongesa,Robinson Musembi,Bernard O. Aduda
摘要
In this study, Electrophoretic Deposition (EPD) technique was used to fabricate TiO2/Nb2O5 composite thin films on FTO coated glass for application as photoelectrodes in Dye Sensitized Solar Cells (DSSC). A TiO2/Nb2O5 ratio of 1:1 was used in a 2-propanol suspension solution with a solid loading of 0.25g/L. Optical investigations showed that the film with thickness of 5.5 m deposited at 35.0 V for 90.0 s had the highest transmittance of 55.0 % at a wavelength () of 1,300 nm. The optical band gap energy (Eg) was 3.884 eV and was found to be dependent on the annealing time. The solar cell fabricated from this film had an open circuit voltage (VOC) of 0.66 V, fill factor (FF) of 57.0%, short current density (JSC) of 5.25 mA/cm2 and photo conversion efficiency (PCE) of 2.0%. Electrochemical Impedance Spectroscopy (EIS) analysis indicate that the DSSC device with thinner photoelectrodes have more efficient electron transport in the photoanode compared to thicker photoelectrodes to achieve higher conversion efficiencies.
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