2011-01-202024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/679534摘要：本計畫主要在探索背照式染料敏化太陽能電池(Back-illuminated DSSCs)之基礎與應用研究。工作電極部分，此計畫主要以鈦板為基材，探討其燒結溫度效應。由於燒結溫度可以幫助二氧化鈦(TiO2)粒子之間的鍵結，過低的燒結溫度將使得TiO2粒子間的鍵結效果不好，使得電子傳輸不易造成效率的下降，然而過高的燒結溫度將使得鈦板的氧化層厚度劇增，造成鈦版的電阻傳輸阻抗明顯上升。另一方面，由於使用一般有機黏結劑的二氧化鈦膠體塗佈於鈦板表面時，必須燒結到一定的高溫才可將黏結劑完全去除，此一條件將限制鈦板的燒結溫度;因此本計畫中擬製備不含有黏結劑的TiO2膠體來塗佈在鈦板基材上，以期使用較低的燒結溫度來製備工作電極。在對電極部分，由於此系統必須使用背照的方式入射光線，相較於一般傳統正面照光的DSSCs，其入射光的量會被白金對電極反射以及吸收，造成總光穿透量較正面照光來的低，進而影響被激發的電子量。此計畫擬使用高穿透度的白金對電極來解決這個問題。 在最佳化以鈦版為工作電極的DSSCs之後，此計畫中將針對此系統的弱點做一些改進。此系統最大的兩個弱點，其一為高溫燒結所造成嚴重的非晶相鈦氧化物含量上升，進而造成總效能的下降；其二為使用背面照光時，於白金對電極處被吸收或反射的光量將上升，造成的光穿透度下降。此計畫將致力於克服此兩大弱點，進而改善此系統的效能。 <br> Abstract: This project aims to explore the fundamental and applications of back-illuminated dye-sensitized solar cells (DSSCs). On the working electrode, the sintering temperature of the working electrode based on the titanium foil (Ti foil) is the main topic to be studied. The extent of necking among TiO2 particles will be examined at various sintering temperatures. The poor necking extent would be found if the sintering temperature is too low, which will cause the poor electron transport and lower cell efficiency. However, the thickness of the metal oxide would become thicker if the sintering temperature is too high, which will cause the increase in the charge transfer resistance. On the other hand, the sintering temperature has to be high enough to remove the organic binder, which is one of the components in the conventional TiO2 paste. Removing the organic binder will restrict the sintering temperature during the fabrication of the working electrode based on the Ti foil. Therefore, in this project, we will prepare a binder-free TiO2 paste and apply to the Ti foil and use lower sintering temperature to fabricate the working electrode. As for the counter electrode, we will prepare the Pt counter electrode with high transmittance to tackle the problem of back-illuminated DSSCs, which have to be illuminated from the back side. As a result, its total incident light will be less than the traditional one, which is illuminated from the front side, due to the reflection by the Pt counter electrode, and causing the lower excited electrons. After optimizing the working electrode of the DSSCs based on the Ti foil, some issues in this system would be solved. There are two major problems in this system. One is the serious formation of amorphous titanium oxide with higher sintering temperature; the other is the increasing absorbed and reflected light by the Pt counter electrode with back illumination. We will make any efforts to overcome these two problems and furthermore improve the cell efficiencies of back-illuminated DSSCs.背照式染料敏化太陽能電池無黏結劑之二氧化鈦膠體高穿透度白金對電極燒結溫度鈦板Back-illuminated dye-sensitized solar cellsBinder-free TiO2 pasteHigh transmittance platinum counter electrodeSintering temperatureTitanium foil