Introducing a New Potential Figure of Merit for Evaluating Microstructure Stability in Photovoltaic Polymer-Fullerene Blends

Perea JD, Langner S, Salvador MF, Sanchez-Lengeling B, Li N, Zhang C, Jarvas G, Kontos J, Dallos A, Aspuru-Guzik A, Brabec C (2017)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2017

Journal

Publisher: American Chemical Society

Book Volume: 121

Pages Range: 18153-18161

Journal Issue: 33

DOI: 10.1021/acs.jpcc.7b03228

Abstract

A theoretical understanding of the microstructure of organic semiconducting polymers and blends is vital to further advance the optoelectronic device performance of organic electronics. We outline the theoretical framework of a combined numerical approach based on polymeric solution theory to study the microstructure of polymer:small molecule blends. We feed the results of ab initio density functional theory quantum chemistry calculations into an artificial neural network for the determination of solubility parameters. These solubility parameters are used to calculate Flory-Huggings intermolecular parameters. We further show that the theoretical values are in line with experimentally determined data. On the basis of the Flory-Huggings parameters, we establish a figure of merit as a relative metric for assessing the phase diagrams of organic semiconducting blends in thin films. This is demonstrated for polymer:fullerene blend films on the basis of the prototypical polymers poly(3-hexylthiophene-2,5-diyl) (P3HT) and poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3-di(2-octyldodecyl)-2,2,5,2;5,2-quaterthiophen-5,5-diyl)] (PffBT4T-2OD). After confirming the applicability of our model with a broader range of materials and differences in molecular weight, we suggest that this combined model should be able to inform design criteria and processing guidelines for existing and new high performance semiconducting blends for organic electronics applications with ideal and stable solid state morphology. (Graph Presented). © 2017 American Chemical Society.

Authors with CRIS profile

Additional Organisation(s)

Involved external institutions

University of Pannonia / Pannon Egyetem Hungary (HU) Harvard University United States (USA) (US)

How to cite

APA:

Perea, J.D., Langner, S., Salvador, M.F., Sanchez-Lengeling, B., Li, N., Zhang, C.,... Brabec, C. (2017). Introducing a New Potential Figure of Merit for Evaluating Microstructure Stability in Photovoltaic Polymer-Fullerene Blends. Journal of Physical Chemistry C, 121(33), 18153-18161. https://dx.doi.org/10.1021/acs.jpcc.7b03228

MLA:

Perea, Jose Dario, et al. "Introducing a New Potential Figure of Merit for Evaluating Microstructure Stability in Photovoltaic Polymer-Fullerene Blends." Journal of Physical Chemistry C 121.33 (2017): 18153-18161.

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