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. 2019 Feb 23;20(4):976. doi: 10.3390/ijms20040976

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Optical transmission, (b) atomic force micrographs, and (c) J–V characteristics of P3HT/SCWNT composites as hole extraction layers. Taken from [127].