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. 2021 Oct 22;12(11):1295. doi: 10.3390/mi12111295

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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(a) Absorption spectra for a 50 nm CuPc thin film thermal evaporated on quartz substrate and the relative changes of absorption efficiency ( $η_{A})$ at different temperatures. (b) The absorption spectra and $η_{A}$ of the developed OSC device at 300 K.