https://scholars.lib.ntu.edu.tw/handle/123456789/577212
標題: | Difluoroterthiophene as promising block to build highly planar conjugated polymer for polymer photovoltaic cells | 作者: | Jhang R.-X Chen G.-L Raja R Chen P.-T Hayashi M Rwei S.-P Hsu S.-H LEE-YIH WANG |
關鍵字: | Absorption spectroscopy; Conjugated polymers; Conversion efficiency; Crystallinity; Density functional theory; Efficiency; Heterojunctions; Hole mobility; Open circuit voltage; Photoelectrochemical cells; Photovoltaic cells; Absorption co-efficient; Bulk heterojunction; Dispersed polymers; Donor-acceptor copolymers; Electron-accepting; Exciton dissociation; Photovoltaic performance; Polymer photovoltaic cells; Polymer solar cells; Absorption; Copolymers; Crystallinity; Current Density; Efficiency; Electrons; Exhibitions; Solar Cells | 公開日期: | 2021 | 卷: | 188 | 來源出版物: | Dyes and Pigments | 摘要: | Developing highly planar semiconducting polymer is essential for achieving high mobility and improving the photovoltaic performance of bulk-heterojunction polymer solar cells. In this contribution, two novel low-bandgap donor-acceptor copolymers, P1-3T and P2-3T2F, consisting of electron-accepting benzothiadiazole acceptor segment and electron-donating terthiophene donor segment with and without fluorine atoms were designed and synthesized. The density functional theory calculations and ultraviolet–visible absorption studies demonstrate that the fluorinated P2-3T2F polymer has more planar backbone conformation, deeper HOMO level, broader absorption spectrum with a vibronic shoulder peak, and higher absorption coefficient compared with the non-fluorinated analogue polymer, P1-3T. Furthermore, P2-3T2F exhibits good crystallinity and high hole mobility, presumably due to the well-ordered lamellar packing and the π-π stacking interaction between the backbones of the conjugated polymers. The optimized polymer solar cell based on P2-3T2F:PC61BM exhibits a short-circuit current density (Jsc) of 12.77 mA cm?2, a fill factor (FF) of 68.99%, an open-circuit voltage (Voc) of 0.80 V, and a maximum power conversion efficiency (PCE) of 7.14%, which is approximately 46% higher than that of the P1-3T:PC61BM device. The enhanced PCE is primarily due to increased light-harvesting ability and interconnected morphology with finely dispersed polymer-rich and PC61BM-rich domains, which improves the efficiency of exciton dissociation and rises the mobility of charge carriers, thus boosting the short-circuit current density and the FF value. Moreover, the relatively deep HOMO of P2-3T2F effectively increases the Voc. ? 2021 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85101018744&doi=10.1016%2fj.dyepig.2021.109206&partnerID=40&md5=b5b2856910e88e02e97a2921eadcff19 https://scholars.lib.ntu.edu.tw/handle/123456789/577212 |
ISSN: | 1437208 | DOI: | 10.1016/j.dyepig.2021.109206 | SDG/關鍵字: | Absorption spectroscopy; Conjugated polymers; Conversion efficiency; Crystallinity; Density functional theory; Efficiency; Heterojunctions; Hole mobility; Open circuit voltage; Photoelectrochemical cells; Photovoltaic cells; Absorption co-efficient; Bulk heterojunction; Dispersed polymers; Donor-acceptor copolymers; Electron-accepting; Exciton dissociation; Photovoltaic performance; Polymer photovoltaic cells; Polymer solar cells; Absorption; Copolymers; Crystallinity; Current Density; Efficiency; Electrons; Exhibitions; Solar Cells |
顯示於: | 高分子科學與工程學研究所 |
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