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A Chlorinated π-Conjugated Polymer Donor for Efficient Organic Solar Cells
Joule ( IF 39.8 ) Pub Date : 2018-06-19 , DOI: 10.1016/j.joule.2018.05.010
Hui Chen , Zhiming Hu , Huan Wang , Longzhu Liu , Pengjie Chao , Jianfei Qu , Wei Chen , Anhua Liu , Feng He

We synthesized a chlorinated benzothiadiazole-T4 polymer donor PBT4T-Cl, in which a chlorine atom had been introduced at the 4 position in the middle thiophene unit to fine-tune the energy level of the final polymers. Compared with its non-chlorinated analog, the PBT4T-Cl-based devices exhibited clear increases in open-circuit voltage and fill factor, achieving power conversion efficiencies (PCEs) up to 11.18% with simple synthesis, which is the highest PCE of the chlorinated polymer-based fullerene polymer solar cells (PSCs) reported to date. Grazing incident wide-angle X-ray scattering, atomic force microscopy, and transmission electron microscopy measurements revealed an optimized morphology of the spin-coated PBT4T-Cl blend films, which supported that chlorine substitution could promote the performance of PSCs. More importantly, the PBT4T-Cl-based devices showed superior stability, with a PCE of 8.16% after 50 days’ device storage. Through this research, the chlorination of low-band-gap polymers provides new insight into designing π-conjugated polymer semiconductors and realizing further enhancement of polymer solar cell efficiency as well as stability.



中文翻译:

用于高效有机太阳能电池的氯化π共轭聚合物供体

我们合成了氯化苯并噻二唑-T4聚合物供体PBT4T-Cl,其中在中间噻吩单元的4位引入了氯原子,以微调最终聚合物的能级。与非氯化物类似物相比,基于PBT4T-Cl的器件的开路电压和填充因子明显增加,通过简单的合成即可实现高达11.18%的功率转换效率(PCE),这是氯化物中最高的PCE迄今已报道了基于聚合物的富勒烯聚合物太阳能电池(PSC)。掠入射的广角X射线散射,原子力显微镜和透射电子显微镜测量揭示了旋涂PBT4T-Cl的最佳形态混合膜,这支持氯替代可以促进PSC的性能。更重要的是,基于PBT4T-Cl的设备显示出卓越的稳定性,在设备存储50天后的PCE为8.16%。通过这项研究,低带隙聚合物的氯化为设计π共轭聚合物半导体提供了新的见识,并进一步提高了聚合物太阳能电池的效率和稳定性。

更新日期:2018-06-19
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