https://scholars.lib.ntu.edu.tw/handle/123456789/504192
標題: | Highly crystalline two-dimensional copolymer with dominant face-on orientation for high performance polymer solar cells | 作者: | Wang, S.-H. Raja, R. Yu, S.-W. Jeng, R.-J. Chen, J.-C. Rwei, S.-P. LEE-YIH WANG |
公開日期: | 2020 | 出版社: | Elsevier Ltd | 卷: | 134 | 起(迄)頁: | 109799 | 來源出版物: | European Polymer Journal | 摘要: | We designed and synthesized a novel series of two-dimensional (2D) conjugated polymers (P1-2T, P2-2T2F and P3-4T2F) containing 2,2′-bithiophene (2T) and 3,3′-difluoro-2,2′-bithiophene (2T2F) as donor units, and 4,7-benzo[c][1,2,5]thiadiazole (BT) and 4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole (DTBT) as acceptor units appended with conjugated vinyl-terthiophene (VTT) side chain. We comprehensively investigated the effect of fluorination and thiophene (T) π-spacer on the optoelectronic properties and photovoltaic performance of the resulting copolymers. In comparison with non-fluorinated polymer P1-2T, the fluorinated polymer P2-2T2F and P3-4T2F had down shifted highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels with an enhanced absorption band. Moreover, 2D grazing incidence wide-angle X-ray scattering and space charge limited current measurement showed that the presence of thiophene π-spacer in P3-4T2F promoted dominant face-on orientation, high crystallinity and enhanced hole mobility, compared with P2-2T2F. As a result, the inverted polymer solar cell based on the P3-4T2F:PC61BM blend exhibited a high power conversion efficiency (PCE) of 6.66% with a Jsc of 12.99 ± 0.30 mA/cm−2. In contrast, the P1-2T:PC61BM and P2-2T2F:PC61BM devices without π-spacer showed a PCE of 2.22% and 0.95%, respectively. The PCE of the P3-4T2F:PC61BM device was further improved to 6.89% by using a polyethylenimine ethoxylated (PEIE) interlayer between ITO and ZnO. This study reinvigorates the key modulation of a 2D conjugated polymer with improved photovoltaic performance. © 2020 Elsevier Ltd |
URI: | https://www.scopus.com/record/display.uri?eid=2-s2.0-85085570759&origin=resultslist&sort=plf-f&cite=2-s2.0-85085570759&src=s&imp=t&sid=a7e58d2b6e88fbd823469365c4888561&sot=cite&sdt=a&sl=0 | ISSN: | 00143057 | DOI: | 10.1016/j.eurpolymj.2020.109799 | SDG/關鍵字: | Conjugated polymers; Crystallinity; Electron energy levels; Fluorine containing polymers; Hole mobility; II-VI semiconductors; Molecular orbitals; Photovoltaic effects; Shims; Thiophene; X ray scattering; Zinc oxide; High performance Polymer solar cells; Highest occupied molecular orbital; Inverted polymer solar cells; Lowest unoccupied molecular orbital; Optoelectronic properties; Photovoltaic performance; Polyethylenimine ethoxylated; Space charge limited currents; Polymer solar cells |
顯示於: | 凝態科學研究中心 |
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