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Asymmetric thieno[2,3-b]thiophene-based electron acceptor featuring a seven fused-ring electron donor unit as core for nonfullerene organic photovoltaics
Organic Electronics ( IF 2.7 ) Pub Date : 2018-07-20 , DOI: 10.1016/j.orgel.2018.07.018
Zhenghui Luo , Guanghao Li , Kailong Wu , Zhi-Guo Zhang , Xiaofeng Chen , Beibei Qiu , Lingwei Xue , Yongfang Li , Chuluo Yang

A n-type organic semiconductor (n-OS) electron acceptor (ITCNTC) based on thieno [2,3-b]thiophene-containing asymmetric seven fused-ring central unit was developed. In comparison with the reported isomer of ITCPTC, ITCNTC exhibits blue-shift absorption spectra and higher LUMO energy level. Organic solar cells (OSCs) based on wide band-gap polymer donor J71 and ITCNTC blends gave power conversion efficiencies (PCEs) of 5.18% without any post-treatment. After thermal annealing (TA), PCE was significantly boosted to 8.52%, with enhanced short circuit current density (JSC) and fill factor (FF). However, the PCE of 8.52% is lower than that of the reported J71:ITCPTC based device (11.63%), which is mainly ascribed to the narrower absorption of ITCNTC and unfavorable morphology. It is noteworthy that the average open circuit voltage (VOC) of the ITCNTC-based device (0.940 V) is 0.06 eV higher than that of the ITCPTC-based device (0.877 V), which is benefitted from the upshifted LUMO energy level of ITCNTC acceptor. These results indicate that the chemical structure of the central fused ring plays a very important role in determining the photovoltaic performance of the n-OS acceptors.



中文翻译:

非对称噻吩并[2,3 - b ]噻吩基电子受体,具有七个稠环电子供体单元,作为非富勒烯有机光伏的核心

开发了基于含噻吩并[2,3 - b ]噻吩的不对称七个稠环中心单元的n型有机半导体(n -OS)电子受体(ITCNTC)。与报告的ITCPTC异构体相比,ITCNTC表现出蓝移吸收光谱和更高的LUMO能级。基于宽带隙聚合物供体J71和ITCNTC共混物的有机太阳能电池(OSC)无需任何后处理即可获得5.18%的功率转换效率(PCE)。经过热退火(TA)后,PCE显着提高到8.52%,短路电流密度提高了(J SC)和填充因子(FF)。但是,PCE为8.52%,低于已报道的基于J71:ITCPTC的器件的PCE(11.63%),这主要归因于ITCNTC的吸收范围较窄和形态不利。值得注意的是,平均开路电压(V OC基于ITCNTC设备(0.940 V)的)是0.06 eV的比基于ITCPTC设备(0.877 V),这是从换高档LUMO能级受益的更高ITCNTC受体。这些结果表明中心稠合环的化学结构在确定n -OS受体的光伏性能中起着非常重要的作用。

更新日期:2018-07-20
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