Fabrication of TiO2 compact layer precursor at various reaction times for dye sensitized solar cells |
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| Affiliation: | 1. Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People''s Republic of China;2. School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, People''s Republic of China;2. Nanyang Technological University/School of Mechanical and Aerospace Engineering, 50 Nanyang Avenue, 639798, Singapore;3. Holst Centre/TNO, High Tech Campus 31, 5656AE, Eindhoven, The Netherlands;4. TNO, De Rondom 1, 5612AP, Eindhoven, The Netherlands;1. School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan,= 430073, PR China;2. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;3. Department of Electrical & Electronic Engineering, South University of Science and Technology of China, Shenzhen, 518055, PR China;4. School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430074, PR China |
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| Abstract: | A compact layer is used to increase the photoelectric conversion efficiency on DSSCs due to it can improve the transparent conduction oxides (TCOs) surface and prevent the electrolyte from directly contacting the ITO (Indium Tin Oxide) substrate. In this study, DSSCs with compact layer reacting for three hours are compared to those without compact layer, where the short-circuit current and solar energy conversion efficiency are improved by 22%, and 26%, respectively. Based on electrochemical impedance spectra (EIS) measurements, we clarify that the compact layer can decrease the charge interfacial resistance and the leakage current due to the fact that the dense TiO2 nanoparticles can effectively prevent charge transport from the photoanode to the ITO substrate. We compared different reacting times for the formation of the compact layer, and showed that the quantum efficiency of DSSC is higher when a 3 h reacting time is adopted with respect to a 24 h processing time. A study of the various molar ratios of the precursor solution has been done. The data showed that the 1 M is the optimal molar ratio. We also studies the compact layer formation on FTO with respect to ITO, showing that the FTO substrate has higher photoelectric conversion efficiency. |
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| Keywords: | Compact layer DSSCs Titanium isopropoxide Acetylacetone |
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