Enhance the performance of dye-sensitized solar cells by balancing the light harvesting and electron collecting efficiencies of scattering layer based photoanodes

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• 作者：Haimin Liu¹ ; ^{xzzhao@whu.edu.cn" class="auth_mail} ; Liangliang Liang¹ ; Tao Peng ; Hadja Fatima Mehnane ; Bobby Sebo ; Sihang Bai ; Zhenhua Yu ; Wenjing Yu ; Wei Liu ; Shishang Guo ; Xingzhong Zhao
• 关键词：Dye-sensitized solar cells ; Scattering layer ; Incident light harvesting efficiency ; Electron collection efficiency ; Diffuse reflectance.
• 刊名：Electrochimica Acta
• 出版年：20 June 2014
• 年：2014
• 卷：132
• 期：Complete
• 页码：25-30
• 全文大小：1590 K

文摘

Thin titanium dioxide (TiO₂) semiconductor layer with different scattering layers are investigated in dye-sensitized solar cells (DSSCs). Usually, the scattering layer is placed after the photoanode films in order to harvest more incidents light. The scattering layer based on rutile phase TiO₂ is prepared, and placed in the different position of the photoanode films (on the surface of the FTO glass, between the two layers of transparent TiO₂ film and after the transparent TiO₂ film). We use STT, TST and TTS as marks (T and S represent the transparent TiO₂ layer and the scattering layer respectively). The result of this study indicates that STT which has the lowest incident light harvesting efficiency demonstrates the highest electron collection efficiency, while TTS which has the highest incident light harvesting efficiency sacrifices the electron collection efficiency greatly. It is discovered that TST, of which the incident light harvesting efficiency basically remains unchanged compared to TTS, reveals higher electron collection efficiency and achieves the maximum photovoltaic conversion efficiency (7.0%). By applying UV-Visible and diffuse reflectance spectroscopy, electrochemical impedance spectroscopy (EIS), the effects of the incident light harvesting and electron collection efficiencies on different cells are analyzed. It makes the best use of this scattering layer and has a reference for the application of other scattering layer types.