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Fine-tuning of Polymer Photovoltaic Properties by the Length of alkyl side chains

Chinese Journal of Polymer Science 2015年第3期33卷 490-498页

作者：秦瑞平 Yu-rong Jiang Hao-xing Zhang Kai-xuan Zhang Qun-ying Zhang 常方高 College of Physics & Electronic Engineering Key Laboratory of Photovoltaic Materials of Henan ProvinceHenan Normal University

This paper reports the synthesis and characteristics of a series of alkyl-substituted planar polymers. The physical properties are carefully tuned to optimize their photovoltaic performance. Depending on the length of soluble alkyl side chains which modify the structural order and orientation substantially in polymer backbones, the device performance can be improved significantly. The tuning of HOMO energy levels optimized polymers＇ spectral coverage of absorption and their hole mobility, as well as miscibility with fullerene; all these efforts enhanced polymer solar cell performances. The short- circuit current, Jsc for polymer solar cells was increased by adjusting polymer chain packing ability. It was found that films with well distributed polymer/fullerene interpenetrating network exhibit improved solar cell conversion efficiency. Enhanced efficiency up to 5.8% has been demonstrated. The results provide important insights about the roles of flexile chains in structure-property relationship for the design of new polymers to be used in high efficient solar cells.

关键词： Polymer solar cells alkyl side chains Morphology Charge mobility.

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alkyl side chain engineering enables high performance as-cast organic solar cells of over 17%efficiency

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Fundamental Research 2023年第4期3卷 611-617页

作者： Xiang Xu Yazhou Qi Xiaoyan Luo Xinxin Xia Xinhui Lu Jun Yuan Yonghua Zhou Yingping Zou State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Department of Physics The Chinese University of Hong KongNew TerritoriesHong Kong 999077China

Achieving high-performance as-cast OSCs is crucial for industrialization in the future,owing to the advantages of better stability,environmental-friendly,and decreasing production *** this regard,we synthesized an ADA′D-A type acceptor,Y6-eC6-BO,by shortening the straight alkyl side-chains on the thiophene position from C_(11) to C_(6) as well as lengthening the branched alkyl side-chains on the pyrrole position of Y6 to achieve a stronger crystallization and better miscibility than *** a result,the corresponding chloroform-processed as-cast PM6:Y6-eC6-BO OSC showed a high PCE of 17.33%,which was one of the highest efficiencies of as-cast *** the as-cast PM6:Y6-eC6-BO OSCs processed from o-xylene displayed a PCE of 16.38%,as far as we know,this is among the highest efficiencies of non-halogenated-solvent processed as-cast *** results demonstrated tailoring the alkyl side-chain of NFAs is a feasible and simple approach to achieve high performance as-cast OSCs and provides guideline in molecular design in the future.

关键词： Organic solar cells alkyl side chains As-cast Green solvent Stability

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