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Engineering the Morphology via Processing Additives in Multiple All-Polymer Solar Cells for Improved Performance

Abstract

In this contribution, we report the working mechanisms of several processing additives on controlling the morphology of four all-polymer systems. The optical and electrical properties, photovoltaic performance, morphology and the dynamic process of film formation of these all-polymer systems were thoroughly examined. We revealed that the effect of additive is largely dependent on the aggregation behaviors of the used polymers. Here, the polymer acceptors with large planar structures have stronger inter-chain interaction, which make their morphology more susceptible to additive treatment than the donors. 1,8-di(R)octanes (R=Cl, Br, I) additives can be applied to multiple all-polymer devices with improved efficiency due to their general capability to increase the crystallinity and the elongated effective time during the film formation. Interestingly, the DBrO outperforms widely used DIO, obtaining a highest efficiency of 8.23% for the PTzBI/P(NDI2OD-T2) based all-polymer solar cells, indicating finer morphology control by subtle change of the additive structure. In contrast, the addition of chloronaphthalene (CN) can alleviate the inter-chain interaction of polymers to prevent the formation of oversized domains, which make it especially efficient for systems using strongly aggregated polymers like P(NDI2OD-T2). Our results provide insight into processing additives and suggest guidelines to rationally select additives for nonfullerene solar cells.

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Publication details

The article was received on 12 Apr 2018, accepted on 11 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8TA03343A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Engineering the Morphology via Processing Additives in Multiple All-Polymer Solar Cells for Improved Performance

    J. Yuan, Y. Xu, G. Shi, X. Ling, L. Ying, F. Huang, T. H. Lee, H. Y. Woo, J. Y. Kim, Y. Cao and W. Ma, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA03343A

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