https://scholars.lib.ntu.edu.tw/handle/123456789/356475
標題: | Enhancing the performance of dye-sensitized solar cells by incorporating nanomica in gel electrolytes | 作者: | Lai, Yi-Hsuan Lin, Chia-Yu Chen, Jian-Ging CHUN-CHIEH WANG Huang, Kuan-Chieh Liu, Ken-Yen Lin, King-Fu JIANG-JEN LIN KUO-CHUAN HO |
關鍵字: | Dye-sensitized solar cells; Gel electrolytes; Nanomica | 公開日期: | 2010 | 卷: | 94 | 期: | 4 | 起(迄)頁: | 668-674 | 來源出版物: | Solar Energy Materials and Solar Cells | 摘要: | Gel-type dye-sensitized solar cells (DSSCs) were fabricated with 5.0 wt% polyvinyidene fluoride-co-hexafluoro propylene (PVDF-HFP) in methoxy propionitrile (MPN) as gel polymer electrolyte (GPE), 1-butyl-3-methylimidazolium iodide (BMII)/iodine (I2) as redox couple, 4-tertiary butyl pyridine (TBP) and guanidine thiocyanate as additives. The incorporation of alkyl-modified nanomica (AMNM) in the PVDF-HFP gel electrolytes caused the reduction of crystallization of PVDF-HFP, which was confirmed by X-ray diffraction (XRD) analysis. The short-circuit current density (JSC) of the cell increased due to the decrease of diffusion resistance, as judged by the electrochemical impedance spectra (EIS) analysis, while the open-circuit voltage (VOC) remained almost the same. As the loading of AMNM in the PVDF-HFP gel electrolyte was increased to 3.0 wt%, the JSC and power conversion efficiency (η) of the cells increased from 8.3 to 13.6 mA/cm2 and 3.5% to 5.7%, respectively. However, the JSC decreased as the loading of AMNM exceeded 3.0 wt%. At higher AMNM loadings, nanomica acted as a barrier interface between the electrolyte and the dye molecules to hinder electron transfer, and thus reducing the cell's photocurrent density. Furthermore, the DSSCs fabricated by dispersing polymethyl methacrylate (PMMA) microspheres in the TiO2 electrode with the GPE containing 3.0 wt% AMNM improved the η to 6.70%. The TiO2 films would exhibit larger porosity by blending with PMMA, leading the penetration of GPEs into the porous TiO2 easier, thus improving the contact between the dye-adsorbed TiO2 surfaces and the GPEs, as characterized by EIS. Moreover, the η of gel-type DSSCs with a 25 μm thickness of surlyn reached 7.96% as compared with 6.70% for the DSSCs with a 60 μm surlyn. © 2009 Elsevier B.V. All rights reserved. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-77649275703&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/356475 |
DOI: | 10.1016/j.solmat.2009.11.027 | SDG/關鍵字: | Blending; Conversion efficiency; Electrochemical corrosion; Electrolysis; Electrolytes; Gels; Iodine; Lithium batteries; Loading; Open circuit voltage; Photoelectrochemical cells; Propylene; Switching circuits; X ray diffraction; X ray diffraction analysis Diffusion resistance; Dye molecule; Dye-Sensitized solar cell; Dye-sensitized solar cells; Electrochemical impedance spectra; Electron transfer; Gel electrolyte; Gel polymer electrolytes; Gel-type; Methoxy; Photocurrent density; Porous TiO; Power conversion efficiencies; Propionitrile; PVDF-HFP; Redox couple; TiO |
顯示於: | 化學工程學系 |
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