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Issue 31, 2017
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Effects of morphology evolution on solution-processed small molecule photovoltaics via a solvent additive

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Abstract

A newly synthesized small molecule donor, BDTT-2DPPBFu, is designed for incorporation into the photo-active layer in solution-processed small molecule organic photovoltaics (SM-OPVs). The effects of a solvent additive (1-chloronaphthalene, CN) on the bulk heterojunction morphology of a BDTT-2DPPBFu donor:fullerene derivative acceptor (PC71BM) are investigated and correlated with the device performance. A TEM analysis revealed that the nanomorphology of the SM-OPVs evolved dramatically with increasing solvent additive volume. With an optimum concentration of 2.5 vol% CN, a nanomorphology with a fibrillar and interpenetrating network on the order of exciton diffusion length (∼10–15 nm) is formed, resulting in improvement of the short-circuit current density, fill factor, and power conversion efficiency. Further GIWAXS studies have shown that the π–π stacking distance of BDTT-2DPPBFu small molecules is reduced and the inter-mixing of PC71BM within the BDTT-2DPPBFu-rich phase in the photo-active layer processed from 2.5 vol% CN is increased, leading to enhanced charge transport and reduced charge recombination and transfer resistance. The present work provides important progress in the nanomorphology of the photo-active layer, which can be effectively tuned via the use of a solvent additive in SM-OPVs.

Graphical abstract: Effects of morphology evolution on solution-processed small molecule photovoltaics via a solvent additive

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Publication details

The article was received on 12 May 2017, accepted on 06 Jul 2017 and first published on 10 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC02088K
Citation: J. Mater. Chem. C, 2017,5, 7837-7844
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    Effects of morphology evolution on solution-processed small molecule photovoltaics via a solvent additive

    Q. V. Hoang, S. Rasool, S. Oh, D. Van Vu, D. H. Kim, H. K. Lee, C. E. Song, S. K. Lee, J. Lee, S. Moon and W. S. Shin, J. Mater. Chem. C, 2017, 5, 7837
    DOI: 10.1039/C7TC02088K

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