Effect of compressed TiO2 nanoparticle thin film thickness on the performance of dye-sensitized solar cells

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• 作者：Jenn Kai Tsai (6)
  Wen Dung Hsu (7)
  Tian Chiuan Wu (6)
  Teen Hang Meen (6)
  Wen Jie Chong (6)
  
• 关键词：Mechanism compression ; Thickness ; Dye ; sensitized solar cells (DSSCs) ; TiO2 ; Doctor blading method
• 刊名：Nanoscale Research Letters
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：8
• 期：1
• 全文大小：364 KB
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• 作者单位：Jenn Kai Tsai (6)
  Wen Dung Hsu (7)
  Tian Chiuan Wu (6)
  Teen Hang Meen (6)
  Wen Jie Chong (6)
  
  6. Department of Electronic Engineering, National Formosa University, Yunlin, 632, Taiwan
  7. Department of Materials Science and Engineering, National Cheng Kung University, Tainan City, 701, Taiwan
  
• ISSN：1556-276X

文摘

In this study, dye-sensitized solar cells (DSSCs) were fabricated using nanocrystalline titanium dioxide (TiO2) nanoparticles as photoanode. Photoanode thin films were prepared by doctor blading method with 420 kg/cm2 of mechanical compression process and heat treatment in the air at 500°C for 30 min. The optimal thickness of the TiO2 NP photoanode is 26.6 μm with an efficiency of 9.01% under AM 1.5G illumination at 100 mW/cm2. The efficiency is around two times higher than that of conventional DSSCs with an uncompressed photoanode. The open-circuit voltage of DSSCs decreases as the thickness increases. One DSSC (sample D) has the highest conversion efficiency while it has the maximum short-circuit current density. The results indicate that the short-circuit current density is a compromise between two conflict factors: enlargement of the surface area by increasing photoanode thickness and extension of the electron diffusion length to the electrode as the thickness increases.