High efficiency dye-sensitized solar cells based on multilayer stacked TiO₂ nanoparticle/nanotube photoelectrodes

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• 作者：A-Young Kim ; Misook Kang ; ^{mskang@ynu.ac.kr}
• 关键词：Nanotube TiO2 ; Nanoparticle TiO2 ; Scattering layer ; Dye-sensitized solar cells ; Incident photon-to-current conversion efficiency
• 刊名：Journal of Photochemistry and Photobiology A ; Chemistry
• 出版年：2012
• 期刊代码：66_10106030
• 类别：ch
• 出版时间：1 April, 2012
• 卷：233
• 期：Complete
• 页码：20-23
• 文件大小：714 K

摘要

To investigate the photon-trapping effect and scattering layer effect of a TiO₂ multilayer in dye-sensitized solar cells (DSSCs), we designed the most optimal electrode using a combined, nanoparticle TiO₂ (TNP)/nanotube TiO₂ (TNT) electrode array. The TNT had a width, wall thickness and inner pore diameter of about 7-9 nm, 1 nm and 6 nm, respectively. The multilayer's efficiency was higher than that of the monolayer in the photocurrent-voltage (I-V) curve. The efficiency of the cell, including the TNT scattering layer, was enhanced and the impedance of electrochemical impedance spectroscopy (EIS) was decreased. These results indicated that the light scattering layer of TNT had a longer electron transfer path and higher charge-collection efficiency. The short circle current was increased by approximately 12.6%and the incident photon-to-current conversion efficiency (IPCE) in the maximum peak was also enhanced by about 25%, compared to the DSSC assembled without the TNT scattering layer.