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Steady Enhancement in Photovoltaic Properties of Fluorine Functionalized Quinoxaline-Based Narrow Bandgap Polymer

机译:氟官能化喹喔啉基窄带隙聚合物光伏性能的稳定增强

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摘要

To investigate the influence of fluoride phenyl side-chains onto a quinoxaline (Qx) unit on the photovoltaic performance of the narrow bandgap (NBG) photovoltaic polymers, herein, two novel NBG copolymers, >PBDTT-DTQx and >PBDTT-DTmFQx, were synthesized and characterized. 2-ethylhexylthiothiophene-substituted benzodithiophene (BDTT), 2,3-diphenylquinoxaline (DQx) [or 2,3-bis(3-fluorophenyl)quinoxaline (DmFQx)] and 2-ethylhexylthiophene (T) were used as the electron donor (D) unit, electron-withdrawing acceptor (A) unit and π-bridge, respectively. Compared to non-fluorine substituted >PBDTT-DTQx, fluoride >PBDTT-DTmFQx exhibited a wide UV-Vis absorption spectrum and high hole mobility. An enhanced short-circuit current (Jsc) and fill factor (FF) simultaneously gave rise to favorable efficiencies in the polymer/PC71BM-based polymer solar cells (PSCs). Under the illumination of AM 1.5G (100 mW cm−2), a maximum power conversion efficiency (PCE) of 6.40% was achieved with an open-circuit voltage (Voc) of 0.87 V, a Jsc of 12.0 mA cm−2 and a FF of 61.45% in >PBDTT-DTmFQx/PC71BM-based PSCs, while >PBDTT-DTQx-based devices also exhibited a PCE of 5.43%. The excellent results obtained demonstrate that >PBDTT-DTmFQx by fluorine atom engineering could be a promising candidate for organic photovoltaics.
机译:为了研究氟苯基侧链在喹喔啉(Qx)单元上对窄带隙(NBG)光伏聚合物的光伏性能的影响,在本文中,使用了两种新型NBG共聚物> PBDTT-DTQx 和<对strong> PBDTT-DTmFQx 进行了合成和表征。使用2-乙基己基噻吩基取代的苯并二噻吩(BDTT),2,3-二苯基喹喔啉(DQx)[或2,3-双(3-氟苯基)喹喔啉(DmFQx)]和2-乙基己基噻吩(T)作为电子给体(D )单元,吸电子受体(A)单元和π桥。与非氟取代的> PBDTT-DTQx 相比,氟化物> PBDTT-DTmFQx 表现出较宽的UV-Vis吸收光谱和高空穴迁移率。短路电流(Jsc)和填充因子(FF)的提高同时提高了基于聚合物/ PC71BM的聚合物太阳能电池(PSC)的效率。在AM 1.5G(100 mW cm −2 )的照明下,开路电压(Voc)为0.87 V(Jsc)时,最大功率转换效率(PCE)为6.40%基于> PBDTT-DTmFQx / PC71BM的PSC,而基于> PBDTT-DTQx 的设备中的12.0 mA cm −2 和FF的61.45%还表现出5.43%的PCE。优异的结果表明,氟原子工程学的> PBDTT-DTmFQx 可能是有机光伏的有希望的候选者。

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