A low cost and high performance polymer donor material for polymer solar cells.

Nat Commun · 2018 · PMC5821836 · PMID 29467393

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an increasing trendno p-value reported

The J sc values show an increasing trend from approximately 15 to 19 mA cm −2 with the increase of the active layer thickness.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.