| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系所 === 96 === This study designed and fabricated the applicability of carbon nano tubes (CNT) of the counter electrode for a dye-sensitized solar cell (DSSC). A nanocrystalline TiO2 layer was fabricated on the FTO-glass substrate of the working electrode, and then sintered in a high-temperature furnace. The working electrode with a TiO2 thin film was immersed in the solution of N-719 (Ruthenium) dye for 12 hours. Moreover, the counter electrode with a layer of Ag (or without a layer of Ag) and with a layer of CNT, which were (or was) fabricated in that order on the FTO-glass substrate, was subsequently prepared. Furthermore, This study also examined the effects of the type of CNT (such as single-wall carbon nanotube, SWCNT and multi-wall carbon nanotube, MWCNT), the type of organic solvent (such as DMAC and acetylacetone), a layer of Ag deposited on the FTO-glass substrate, and the sintering temperature on the performance of the DSSC. Finally, the DSSC was assembled, the power conversion efficiency of the DSSC was measured using an I-V measurement system (AM1.5 100mW/cm2 ), and the incident photo conversion efficiency (IPCE). This study for fabricating the solution of CNT with the functional group is as mix organic solvent with CNT and surfactant of TOAB, and in an ultrasonic homogenizer. The easily establishes the function-group at CNT in organic solvent of solution of CNT was acetylacetone. The surfactant (such as TOAB) used herein created the functional group with the hydrophilic endpoint at SWCNT, so the dispersion of SWCNT was improved in the organic solvent of the hydrophobic acetylacetone, and the performance of DSSC with SWCNT/acetylacetone was also facilitated.The solution of Ag-paste(ca 80%) on the top of the FTO-glass substrate in the first layer of DSSC. The organic solvent of the SWCNT film was acetylacetone and the sintering temperature was 200℃ in the second layer of DSSC. This film of SWCNT/Ag markedly increased the IPCE from 3.9% (conventional DSSC with a thin film of platinum of the counter electrode) to 15.3% (DSSC with SWCNT/Ag/acetylacetone), as the wavelength of the light was 380 nm. Furthermore, as the wavelength of the light is 550 nm, the IPCE of the DSSC with CNT/Ag/acetylacetone (6.8%) is nearly equal to that of conventional DSSC (7.2%). Most interestingly, this study shows that the power conversion efficiency of the DSSC with CNT/Ag/acetylacetone (1.3037%) is not inferior to that of DSSC with a thin film of platinum on the counter electrode (1.25%).
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