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Impact of Highly-Crystalline, Isoindigo-Based Small-Molecular Additives for Enhancing Performance of All-Polymer Solar Cells

Abstract

We have developed a simple yet versatile approach for enhancing the performance of all-polymer solar cells (all-PSCs) using highly crystalline small-molecular additive, 6,6’-dithiopheneisoindigo (DTI). The DTI additive in a blend of PTB7-Th donor and P(NDI2HD-T) acceptor enhances the power conversion efficiency of all-PSCs from 5.9 to 6.8%. Based on the analyses of the electrical, optical, and structural properties of all-PSCs, it is suggested that DTI additives promote tighter π-π packing and larger sizes of crystalline domains. Such morphological changes of the PTB7-Th:P(NDI2HD-T) blend films upon the addition of DTI enhance exciton lifetime and diffusion length, which are proved by static and femtosecond-transient absorption spectroscopies and time-resolved photoluminescence. As a result of improved exciton dissociation probability and charge transport, short-circuit current density of all-PSCs is greatly increased. Importantly, we also show that the DTI additive can be applied to other all-PSC systems with different polymer donors and nathalenediimide (NDI)-based polymer acceptors, where the efficiencies of all-PSC are enhanced by 10–20%.

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Publication details

The article was received on 06 Aug 2017, accepted on 11 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06939A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Impact of Highly-Crystalline, Isoindigo-Based Small-Molecular Additives for Enhancing Performance of All-Polymer Solar Cells

    H. Cho, G. Han, R. Younts, W. Lee, B. Gautam, S. Lee, C. Lee, T. Kim, F. S. Kim, K. gundogdu and B. Kim, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06939A

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