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Charge carrier transport and contact selectivity limit the operation of PTB7 based organic solar cells of varying active layer thickness

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Table 1 Device photovoltaic parameters measured under an illumination of 100 mW cm !2 (AM1.5 G)
Fig. 1 Current density–voltage characteristics of devices fabricated with P3HT:PC 60 BM and PTB7:PC 60 BM measured: (a) under 1 sun light intensity and (b) diode curve under dark conditions
Fig. 2 (a) Two representative examples (Devices 2, 3, and 5) that illustrate the differences in the IS response for the two systems under study P3HT:PC 60 BM and PTB7:PC 60 BM measured at 1 sun light intensity and at applied voltages of 0.45 and 0.55 V, res
Fig. 3 Chemical capacitance and carrier density values as a function of the applied bias extracted from IS (filled symbols) and CE (open symbols)
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