| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 101 === This present work successfully optimized the fabrication condtions of the new solar cell (New Solar Cell-1, NSC1), which has been devolped in this reaserch group since 2011, thereby increasing the photon-to-current conversion efficiency and improving the long-term stability of it. Visible-light-driven photocatalyst CuFeO2 powder synthisized by ion-exchange method and visible-light-driven photocatalyst WO3 powder with Pt cocatalyst loaded via photodeposition served as the photocathode and the photoanode of the NSC-1, respectively. The absorption range of the as-prepared photocatalysts in this research covers almost the entire solar spectrum. The electron-hole pairs, generated while the photocatalyst are exposed under solar light, are capable of reacting electrochemical species in the electrolyte of two distinct chambers, leading the occurence of reduction and oxidation in the electrolytes to fuel the intrinsic galvanic cell within the NSC-1 for power generation.
The optimization of the NSC-1 system in this reaserch focuses on the fabrication condtions of the electrodes. By minipulating the amount of dropped-coating photocatalyst sluury on FTO substrate, which serves as the solar cell part, SCP, and utilizing sputtering coating Pt on FTO substrate, which serves as the fuel cell part, FCP, for the hightest solar cell efficency, this present work conclued that the dropped-coating 40 μL slurry of CuFeO2 and the dropped-printing 20 μL slurry of Pt/WO3 on the SCP, meanwhile the fully coverage Pt on FTO prepared by sputtering coating served as the FCP, offered the optimized fabrication condtions for the NSC-1.
After investigation by potential static equipment among the NSC-1 system results, 0.32 V in the open circuit voltage was observed under the exposed area of 0.56 cm2. It was found that the short circuit current density and filling factor were 3.06 x 10-3 mA/cm2 and 28.57%, respectively. The calculated solar cell efficiency of the NSC-1 device was 2.79 x 10-4%, which was higher than that of the pre-work NSC system by 18 times.
Not only was the improvment of NSC systme on the solar cell efficiency, but it was significantly on the long term stability test. After 2500-seconds operation in which the incident light had been chopped repeatly for 14 times, the photovoltaic responds of the optimized NSC-1 remained extremely stable. That is, nearly no decay in Voc of the optimzed NSC-1 was observed.
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