以多壁奈米碳管及石墨烯修飾TiO2奈米顆粒製備光電極應用於染料敏化太陽能電池

Application of Multi-wall Carbon Nanotube and Graphene modified TiO2 nanoparticle to Dye-sensitized Solar Cells

許芷瑄(Chih-hsuan Hsu)

指導教授 ： 段葉芳

國立臺北科技大學/工程學院/化學工程研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00468

摘要

在染料敏化太陽能電池(DSSC)中奈米TiO2薄膜光電極是影響染料敏化太陽能電池光電特性的重要因素。本研究主要改善染料敏化太陽能電池元件中之工作電極暗電流的產生，所以在TiO2工作電極中添加導電性良好之材料，進而增進此太陽能電池的效率與穩定性。使用溶膠凝膠法製備二氧化鈦奈米顆粒，並在製備過程中分別添加多壁奈米碳管及石墨烯兩種導電性良好的材料，可以增加DSSC之短路電流密度(short-circuit current density)，減少暗電流發生進而有效提升DSSC的光電轉換效率。使二氧化鈦奈米顆粒披覆在多壁奈米碳管(MWCNT)上；薄片狀石墨烯覆蓋在二氧化鈦奈米顆粒表面上，製備出 TiO2-CNTs和TiO2-Graphenes奈米複合粉末，作為染料敏化太陽能電池(DSSC)中之光電極材料。在DSSC光電極的製備上使用旋轉塗佈法將P25 TiO2奈米顆粒混合TiO2-CNTs、TiO2-Graphenes複合粉末塗佈在ITO導電玻璃上。經過太陽能光電轉換效率的測試結果顯示，添加TiO2-CNTs和TiO2-Graphenes奈米複合粉末可以增加電池短路電流密度(Isc)，加入TiO2-CNTs奈米複合粉末讓DSSC的光電轉換效率從原先之3.5928 %最高提升到5.242 %，加入TiO2-Graphenes奈米複合粉末最高提升到5.619 %。

關鍵字

染料敏化太陽能電池 ； 溶膠凝膠法 ； 多壁奈米碳管 ； 石墨烯 ； 奈米二氧化鈦

並列摘要

The nanocrystalline-TiO2 film is a crucial factor of photoelectrode performances in dye-sensitized solar cell. In this study, we decreased dark current generation in the working electrode of the dye-sensitized solar cell. By adding good conductivity materials into TiO2 working electrode and thereby enhanced the efficiency and stability of solar cells.We used sol-gel method to prepare nanoscale titanium dioxide (TiO2). During the preparation we added multi-walled carbon nanotubes and graphene that are well-conductive materials, since CNT and graphene can increase the short-circuit current density of DSSC therefore reduce the dark current generation, thus the light-to-electricity conversion effectively of DSSC can be effectively raised. We used TiO2-CNTs, TiO2 nanoparticles coated on the surface of the muti-wall carbon nanotubes, and TiO2-Graphene composite nanopowders, the graphene sheets covered heavily with TiO2 layer, as the photoelectrode materials for dye-sensitized solar cells (DSSC). The DSSC photoelectrodes were prepared by spin coating on transparent conductive Indium tin oxide (ITO) substrates. According to light-to-electricity conversion efficiency test, adding TiO2-CNTs and TiO2-Graphenes nano composite powders could increase the values of short-circuit current density (Isc) obviously, and also improved the light-to-electricity conversion efficiency from 3.5928 % to 5.242% by TiO2-CNTs and 5.619% by TiO2-Graphenes.

並列關鍵字

Dye-sensitized solar cells ； Sol-Gel method ； Multi-wall carbon nanotube(MWCNT) ； Graphene ； TiO2 nanoparticles

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