Journal of Industrial and Engineering Chemistry, Vol.50, 96-101, June, 2017
Effects of a TiO2:CaO barrier layer on the back electron transfer in TiO2-based solar cells
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A TiO2:CaO mixed overlayer was formed on TiO2 photoelectrodes, and the resulting photoelectrodes were applied to dye-sensitized solar cells (DSSCs). DSSC with the mixed overlayer showed an increase in shortcircuit current (Jsc), open-circuit voltage (Voc), and
fill factor (FF), resulting in a 17% enhancement in photovoltaic performance, compared to that of reference cell. It was found that, by incorporating the mixed overlayer, light harvesting and electron collection efficiency were enhanced, thereby increasing Jsc. The enhancement in Voc resulted from a reduced back electron transfer, and the increased FF was attributed to a decreased series resistance and an increased shunt resistance.
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