Time-effective fabrication of TiO2 colloidal solution via microwave-assisted solvothermal process and its application in dye-sensitized solar cells
| Autor: | Ching-YuTsai, 蔡晴羽 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 A clean and time-effective process to prepare anatase TiO2 colloidal solution via sol-gel microwave-assisted solvothermal method and its application for dye-sensitized solar cells was investigated in this study. Via a sol-gel microwave-assisted solvothermal reaction, the as-prepared colloidal solutions can be directly used for the paste preparing without the need of solvent exchange. Simple bath and probe sonication treatments allow to improve the aggregation of anatase nanoparticles and is beneficial for obtaining homogeneous TiO2 paste. However, the well-dispersed TiO2 films were found to induce cracks as removing the solvent and binders due to the small pore size of films. In this case, addition of a small amount of deionic water into the paste provoked a slight aggregation of TiO2 nanoparticles and effectively avoided the occurrence of film cracks. In parallel, anatase nanocrystals exposed of {001} or {101} facets were tailored by using different solvents or chelating agent in sol-gel processes. Anatase nanocrystallites exposed of {001} facets were found to retard the electron recombination and increase electron lifetime in DSSC. TiO2 prepared using 1-octanol exhibited small crystallite size around 4-8 nm but also the longest electron transportation path. The photoanode prepared using OCT sample demonstrated the optimal dye loading properties and longest electron lifetime that demonstrates a power conversion efficiency up to 7.7 %. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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