Figure 4.

(a) Device schematic and (b) SEM cross-section of an organic photovoltaic device with a perforated Ag film as transparent contact. The device area is (300 μm)². (c) Device optical transmission spectra prior to Al contact formation. The high extinction due to absorption by the active layer occurs around 500 nm and is indicated by the arrow. (d) Dark (dot-dash) and illuminated (lines) J − V curves for fully fabricated devices using the Ag/polymer materials shown in (c). Device hole array pitches are: 320 nm (green), 400 nm (red), and 480 nm (blue). Also shown is the performance of a similar device having an unpatterned 50 nm thick Ag electrical contact (dark: dashed, illuminated: black). (The colour version of this figure is included in the online version of the journal.)