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. 2015 Jul 9;5:11977. doi: 10.1038/srep11977

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(a) Schematic representation of a PTB7:PC₇₁BM based thin film with the diatom frustules on top layer. (b) Experimental absorption spectrum for the model of planar active layer without diatom frustule on top (black curve) and with diatom frustule (red curve), with the experimental absorption enhancement curve for diatom frustule (green dashed curve).