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(Color) (a) Image of a photovoltaic double heterojunction structure consisting of copper phthalocyanine/ 3,4,9,10-perylenetetracarboxylic bis-benzimidazole/ bathocuproine on glass substrate precoated with an indium tin oxide (ITO) anode layer. The sample has a sputter-deposited vertical stripe ITO cathode, which is not discernible due to the similar transmissivity with and without the ITO cathode. (b) Transmission spectra for photovoltaic structures as in (a), with (filled squares), (open circles), (open triangles), and (open upside-down triangles) thick Ag cathode layers. The curve shapes reflect the absorption spectrum of copper phthalocyanine. The inset shows optical transmission averaged over wavelengths of vs thickness of the Ag layer. The line represents a fit to the data.
Power conversion efficiency, , and responsivity, , under simulated AM1.5G solar illumination vs cathode Ag layer thickness. The solid lines serve as guides to the eye, while the dashed lines represent values for conventional devices.
External quantum efficiency (EQE) for a conventional, opaque cell (filled squares), a semitransparent cell with a thick Ag/ITO compound cathode (open upside-down triangles), a semitransparent cell with a thick Ag/ITO compound cathode (filled triangles), a semitransparent cell with a thick Ag/ITO compound cathode (open circles), and a semitransparent cell with an ITO-only cathode (filled diamonds).
Current-voltage characteristics for a single metal-free heterojunction cell (filled squares), and a two-cell tandem stack (open diamonds).
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