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. 2017 Jan 16;8:14068. doi: 10.1038/ncomms14068

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Copyright © 2017, The Author(s)

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Photovoltaic parameters as a function of PCDTBT concentration (x, 0≤x≤1) in PTB7:PCDTBT:PC₇₁BM (1−x:x:1.5) blends (a,b) and PC₆₁BM concentration (y, 0≤y≤1.5) in PTB7:PCDTBT:PC₇₁BM:PC₆₁BM (0.9:0.1:1.5−y: y) blends (c,d). The average and s.d. values in figures a–d were calculated using data from more than 16 cells. (e) EQE spectra and (f) J_ph–V_eff characteristics of the b-, t- and q-OPVs. The EQE enhancement indicates the ratio of ternary (dotted turquoise line) or quaternary (dotted red line) devices to the PTB7-based binary device.