| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 97 === The single-crystalline anatase TiO2 nanorods (NRs) have been synthesized by two steps in hydrothermal reaction and characterized by TEM, HR-TEM and BET. TiO2 NRs are also identified by Raman and XRD, presented only existence of anatase phase. Long TiO2 NRs (LNRs) also can be prepared by a modified gel-sol process. Monodispersed TiO2 NR particles exhibit high dispersity without large agglomerates, which result in a compact and crack-free TiO2 thin film.
The light-to-electricity of terpineol-based TiO2 pastes with TiO2 NRs and P25 electrodes in dye-sensitized solar cell is obtained the same conversion efficiency 4.57 %. Owing to TiO2 NRs have better conductivity, transparency but lack of scattering property; three different P25/NRs composites are prepared with 25 wt% (P1/R3), 50 wt% (P1/R1), and 75 wt% (P3/R1) NRs, respectively. Higher conversion efficiency of 5.18 % and 5.08 % are achieved by P1/R3 and P1/R1, respectively, due to cooperation of suitable combination of NRs and scattering particulate P25. We also observed that the TiO2 NR film have good thermal stability because of maintaining its morphology and single-crystalline phase even though after sintering at 550 ℃. Finally, an enhancement of efficiency from 4.57 % to 4.88 % and even 5.67 % for P25 and TiO2 NRs, respectively, results from an improved cell assembly procedure.
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