| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 98 === Randomly deposited titania nanofibers from the polymer-assisted electrospinning fabrications were utilized as the light propagation matrix and the electron transporter in the poly(3-hexyl thiophene) (P3HT)/TiO2 heterojunction solar cells. Taking the advantages of light scattering effects occurred within the titania nanofiber scaffolds, the light path lengths of the incident irradiation were significantly increased as functions of fiber diameters and fiber deposition thicknesses. Assembles of the P3HT/TiO2 heterojunction photovoltaic devices were first investigated in terms of the extra fiber compression, the P3HT/TiO2 ratios, the preferred scattering bands, and more. Photovoltaic outcomes were then carefully examined and analyzed. For the light scattering and propagation effect, it was found that the titania nanofiber with the average diameter of 290nm had the preferred scattering band mostly overlapped with the P3HT absorption wavelength. As a result, this particular sample revealed the best performance in comparison with other devices with different titania fiber diameters. Moreover, the thickening of titania nanofiber deposition layers was incorporated with the increase of energy conversion. Experimental results showed that the current densities and the fill factors were both linearly increased with the cell thicknesses, suggesting the energy accumulation from the light scattering effects. These observations indicated the light propagation and the improvement of energy conversion efficiencies were successfully demonstrated in the solid-state heterojunction solar cells constructed by electrospun titania nanofibers and conducting polymers.
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