| Summary: | 博士 === 國立中興大學 === 化學工程學系所 === 103 === Owing to the exhaustion of natural energy resources, people are trying any research for the substitute energy resource, especially in solar energy. Dye-sensitized solar cells (DSSC) with much better advantages than silicon solare have gotten lots of attention because of its convenient fabrication, low-cost materials, any angle of light illumination and high efficiency with low light intensity since M. Gratzel introduced it at 1990s. In the past two decades, people did kinds of research to make DSSC to get into our lifes, such as larger modules, which is placed on the wall of building to provide electricity, or smaller modules for wireless keyboard of computer or tablelet. There are lots of researchs in DSSC with ifferent flexible or rigid electrodes, long-terrn typed electrolytes, low-cost fabrication and the sealed technique for extending lifetime. The purposes of above researchs are the ways to generate the best power conversion efficiency and increase the applications of DSSC.
There are four parts in my thesis, I fabricate suitable electrodes for DSSC and inverted Polymer solar cells (PSC). First part showed surface metallization of Ni/Pt on a insulated polyimide is carried out via a wet chemical process, where top Pt acts as the catalyst and bottom Ni is the conduction/light-reflection layer. This Ni/Pt bi-layer prepared as counterelectrode for DSSC successfully reduced the amount of Pt loading and made efficiency to 7%, and lowered its sheet resistance (0.173 Ω/?) and charge transfer resistance (0.38 Ωcm2).
In order to fabricate the whole flexible DSSC, the Electrophoretic-co-deposition (EPD) process, a low-temp method for making a complex structured photoanode, was used in second part. ITO glass was deposited with two kinds of nano particles (ZnO and TiO2) together for the photoanode by EPD. Larger TiO2 particles (100nm) deposited on the top of nano particles layers were used as scattering layer to form a low-temp-processed photoanode and increased the performance of DSSC.
Third part showed the elelctron transporting layer (ETL) of PSC added on FTO substrate for photoanode in DSSC. The ultrafine ETL on FTO which has good electron mobility was formed by immersing in TiCl4 solution and also raised the light transparency and the adhesion between FTO and screen-printed TiO2 layers. When the ETL added in DSSC, it increased the photocurrent and efficiency with 15% and 14%, respectively.
Fourth part showed the results of two kinds of surface modification materials (Nb2O5, PEIE) added into PSC, which was also used blended metal oxides (ZnO, Ta2O5) as cathodic butter layer (CBL). Nb2O5 and PEIE were benefit for PSC and raised its efficiency over than 15%.
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