Indium-Free PTB7/PC₇₁BM Polymer Solar Cells with Solution-Processed Al:ZnO Electrodes on PET Substrates

Figure 3

(a) Current-voltage curves for the best devices with AZO sputtered on glass, solution deposited AZO on glass, and solution-processed AZO on PET foil. Inset: external quantum efficiency (EQE) for a cell on PET foil. (b) Photovoltaic parameters for the curves in (a). (c) Stability under AM1.5 irradiation in air. (d) Normal incidence absorbance spectra of the active layer with and without a MoO₃ (15 nm) top layer before (solid curves) and after 5-hour irradiation in air (dotted curves). The interference fringes are due to the AZO layer.

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(b)

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