https://scholars.lib.ntu.edu.tw/handle/123456789/491333
標題: | Regioregularity effects in the chain orientation and optical anisotropy of composite polymer/fullerene films for high-efficiency, large-area organic solar cells | 作者: | Chuang, S.-Y. Chen, H.-L. Lee, W.-H. Huang, Y.-C. Su, W.-F. Jen, W.-M. WEI-FANG SU CHUN-WEI CHEN HSUEN-LI CHEN |
公開日期: | 2009 | 卷: | 19 | 期: | 31 | 起(迄)頁: | 5554-5560 | 來源出版物: | Journal of Materials Chemistry | 摘要: | In this paper, we demonstrate the strong influence of the regioregularity (RR) of poly(3-hexylthiophene) (P3HT) on the optical anisotropy of hybrid P3HT/fullerene films before and after thermal annealing. We determined the conversion efficiency and characterized the optical anisotropy of P3HT/6,6-phenyl-C61-butyric acid methyl ester (PCBM) blends featuring various values of RR. Unlike grazing-incidence X-ray diffraction analysis, optical anisotropic measurement provides a clear and convenient view of the polymer orientation and the device anisotropic absorption at the same time. By calculating the in-plane and out-of-plane optical constants (extinction coefficients and refractive indices), we determined that the optical anisotropy of P3HT/PCBM films was improved in both orientations upon increasing the RR. Upon increasing the thermal annealing temperature, the main chains of high-RR P3HT were converted from an amorphous structure to an alignment parallel to the substrate, resulting in higher optical anisotropy. The degree of anisotropy of the high-RR P3HT/PCBM blend was up to six times higher than that of the low-RR sample. This strong RR effect on optical anisotropy was also evident in the power conversion efficiency of large-area P3HT/PCBM-based organic solar cells. © 2009 The Royal Society of Chemistry. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/491333 | DOI: | 10.1039/b904870g | SDG/關鍵字: | Amorphous structures; Anisotropic absorption; Before and after; Butyric acids; Chain orientation; Degree of anisotropy; Extinction coefficients; Grazing incidence X-ray diffraction; High efficiency; In-plane; Main chains; Methyl esters; Optical anisotropic; Organic solar cell; Out-of-plane; Poly-3-hexylthiophene; Power conversion efficiencies; Regioregularity; RR-P3HT; Thermal-annealing; Composite films; Conversion efficiency; Esters; Fatty acids; Light transmission; Optical anisotropy; Optical constants; Photovoltaic cells; Refractive index; Solar cells; Solar energy; X ray diffraction analysis; Optical films |
顯示於: | 材料科學與工程學系 |
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