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. 2015 Jul 16;6:7730. doi: 10.1038/ncomms8730

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(a) Equivalent electronic circuit of the series/series (SS) triple-junction organic solar cells. (b) Three-dimensional efficiency map of the SS triple-junction devices as a function of the absorbers' bandgaps (E_g) of the three subcells. (c) Equivalent electronic circuit of the series/parallel (SP) triple-junction devices. (d) Three-dimensional efficiency map of the SP triple-junction organic solar cells as a function of the absorbers' bandgaps of the three subcells.