A Synergetic Effect of Molecular Weight and Fluorine in All-Polymer Solar Cells with Enhanced Performance

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• 作者：Shanshan Chen ; Yujin An ; Gitish K. Dutta ; Yiho Kim ; Zhi-Guo Zhang ; Yongfang Li and Changduk Yang
• 刊名：Advanced Functional Materials
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：27
• 期：2
• 全文大小：3352K
• ISSN：1616-3028

文摘

A synergetic effect of molecular weight (M_n) and fluorine (F) on the performance of all-polymer solar cells (all-PSCs) is comprehensively investigated by tuning the M_n of the acceptor polymer poly((N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl)-alt-5,5′-(2,2′-bithiophene)) (P(NDI2OD-T2)) and the F content of donor polymer poly(2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-dyl-alt-thiophene-2,5-diyl). Both M_n and F variations strongly influence the charge transport properties and morphology of the blend films, which have a significant impact on the photovoltaic performance of all-PSCs. In particular, the effectiveness of high M_n in increasing power conversion efficiency (PCE) can be greatly improved by the devices based on optimum F content, reaching a PCE of 7.31% from the best all-PSC combination. These findings enable us to further understand the working principles of all-PSCs with a view on achieving even higher power conversion efficiency in the future.