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. 2018 Apr 20;23(4):962. doi: 10.3390/molecules23040962

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© 2018 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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J-V characteristics (a) and the corresponding external quantum efficiencies (EQE) spectra (b) of the best solar cells from P1, P2 or P4 blended with PC₇₀BM.