Organic chromophore-sensitized ZnO solar cells: Electrolyte-dependent dye desorption and band-edge shifts

详细信息    查看全文

• 作者：Marí ; a Quintana ; Tannia Marinado ; Kazuteru Nonomura ; Gerrit Boschloo ; Anders Hagfeldt
• 关键词：Photoelectrochemical solar cell ; Grä ; tzel cell ; Mesoporous electrode
• 刊名：Journal of Photochemistry and Photobiology A: Chemistry
• 出版年：2009
• 出版时间：25 February 2009
• 年：2009
• 卷：202
• 期：2-3
• 页码：159-163
• 全文大小：639 K

文摘

An organic chromophore D5 (3-(5-(4-(diphenylamino)styryl)thiophene-2-yl)-2-cyanoacrylic acid) was tested as a sensitizer in photoelectrochemical mesoporous ZnO solar cells. Using thin (3 μm) mesoporous ZnO electrodes, high incident photon-to-current conversion efficiencies of up to 70 % were obtained, while power conversion efficiencies up to 2.4 % were found in simulated sunlight (100 mW cm⁻²). Long dye adsorption times (16 h) could be used without aggregation or precipitation of the dye. The composition of the iodide/triiodide-based electrolyte was found to be crucial in optimization of the ZnO-based dye-sensitized solar cell. A high concentration of Li⁺ ions was found to be shift the ZnO conduction band edge to more negative potential, whereas opposite behavior is found for mesoporous TiO₂ cells. It was also found to be detrimental for solar cell performance and stability. Electrolyte-dependent and photoinduced dye desorption from the ZnO electrode was identified as a major stability problem in D5-sensitized ZnO solar cells.