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Issue
Korean Chemical Engineering Research,
Vol.49, No.2, 175-180, 2011
혼성반도체로 제조된 염료감응형 태양전지의 전기화학적 특성
Electrochemical Characterization of Hybrid Semiconductor-Based Dye-Sensitized Solar Cells
이성규, 정의경, 임지선, 이영석
본 연구에서는, 전자의 재결합을 감소시켜 염료 감응형 태양전지의 효율을 향상시키고자 다른 에너지 준위를 갖는 TiO2와 V2O5을 혼합하여 TiO2/V2O5 혼성반도체를 제조하였다. 또한 제조된 TiO2/V2O5 혼성반도체는 페인트 쉐이커를 이용하여 회쇄 후 염료 감응형 태양전지의 제조 및 전기화학적 특성 평가를 함으로써 V2O5 혼합 및 회쇄 효과가 전지효율에 미치는 영향을 고찰하였다. I-V 곡선을 통하여 측정된 염료 감응형 태양전지의 효율은 V2O5 혼합 및 회쇄효과에 의하여 2.9에서 5.7%로, TiO2 염료 감응형 태양전지에 비하여 약 2배 증가하였다. 이러한 결과는 TiO2의 전도대보다 낮은 전도대를 갖는 V2O5의 도입으로 효과적으로 전자를 FTO 유리에 전달하여, 전자가 염료 및 전해질과의 재결합을 감소하게 되어 에너지 전환효율이 증가된 것으로 여겨 진다. 또한, 임피던스 결과도 회쇄된 TiO2/V2O5 혼성 반도체의 효과를 나타내는 TiO2/염료/전해질 계면의 저항감소를 보여 주었다.
In this study, the TiO2/V2O5 hybrid semiconductors were prepared by mixing TiO2 and V2O5, and a subsequent smash process to reduce the recombination of electron and improve the efficiency of solar cells. Dye-sensitized solar cells were constructed using the resultant hybrid semiconductor, and their electrochemical properties were also investigated. The photocurrent-voltage curve obtained with the cells indicated a significant increase in the efficiency from 2.9 to 5.7% by the factor of 2 compared to the result obtained only with TiO2. It is believed that the introduction of V2O5 effectively transport electrons in the TiO2 conduction band to FTO glass and suppress recombination with the dye and/or the electrolyte, thus yielding an efficient performance of the dye sensitized solar cell. The impedance values also indicated a decrease of resistance in the interface of TiO2/dye/electrolyte supporting the constructive contributions of the smashed TiO2/V2O5 hybrid semiconductors for the efficiency.
Keywords: TiO2; V2O5; Smash; Energy Conversion Efficiency; Dye-Sensitized Solar Cell
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