https://scholars.lib.ntu.edu.tw/handle/123456789/575892
標題: | Methyl-Branched Side Chains on Polythiophene Suppress Chain Mobility and Crystallization to Enhance Photovoltaic Performance | 作者: | Chu J.-Y Lin C.-Y Tu T.-H Hong S.-H Chang Y.-Y Yang C.-W Chan Y.-T Liu C.-L Komarov P.V YI-TSU CHAN CHENG-LIANG LIU SHIH-HUANG TUNG |
關鍵字: | Butyric acid; Conversion efficiency; Differential scanning calorimetry; Dye-sensitized solar cells; Efficiency; Glass transition; Heterojunctions; X ray scattering; Bulk heterojunction solar cells; Crystallization rates; Fullerene derivative; Grazing incidence small-angle X-ray scattering; Optoelectrical properties; Photovoltaic performance; Poly(3-hexylthiopene); Power conversion efficiencies; Polymer blends | 公開日期: | 2021 | 卷: | 54 | 期: | 8 | 起(迄)頁: | 3689-3699 | 來源出版物: | Macromolecules | 摘要: | We synthesized a polythiophene with methyl-branched side chains, poly(3-2-methylpentylthiophene) (P3MPT), and studied the thermal properties, morphology, optoelectrical properties, and photovoltaic performance of P3MPT blended with the fullerene derivative, [6,6]-phenyl C60-butyric acid methyl ester (PCBM). The results are compared to those of the commonly used poly(3-hexylthiopene) (P3HT) with linear side chains to investigate the effects of the methyl-branched side chain. Differential scanning calorimetry (DSC) shows a higher glass transition temperature, and both X-ray diffraction and UV-vis absorption reveal a lower crystallization rate for P3MPT as compared to P3HT, due to the methyl-branched side chains that more efficiently suppress the chain mobility. Such behaviors can create an optimal as well as a stable structure for bulk-heterojunction solar cells so that the P3MPT/PCBM-based device not only shows a higher power conversion efficiency (PCE) but can much more effectively maintain the efficiency with time than the P3HT/PCBM-based device does. The stable phase-separated structure in the P3MPT/PCBM blend is confirmed by the grazing-incidence small-angle X-ray scattering (GISAXS) technique, which explains the superior long-term stability of the P3MPT/PCBM solar cell. ? 2021 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85105093638&doi=10.1021%2facs.macromol.1c00346&partnerID=40&md5=faadf2889edf8e9fd906f1f2cb7eb192 https://scholars.lib.ntu.edu.tw/handle/123456789/575892 |
ISSN: | 249297 | DOI: | 10.1021/acs.macromol.1c00346 | SDG/關鍵字: | Butyric acid; Conversion efficiency; Differential scanning calorimetry; Dye-sensitized solar cells; Efficiency; Glass transition; Heterojunctions; X ray scattering; Bulk heterojunction solar cells; Crystallization rates; Fullerene derivative; Grazing incidence small-angle X-ray scattering; Optoelectrical properties; Photovoltaic performance; Poly(3-hexylthiopene); Power conversion efficiencies; Polymer blends |
顯示於: | 化學系 |
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