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Dependence of short-circuit photocurrent density of single-layered cells on substrate temperature during codeposition. ratio was 1:1. Simulated solar light was irradiated on the ITO electrode.
(a) Three-layered cell; (b) current–voltage characteristics of a three-layered cell incorporating a -thick (5:6) interlayer codeposited at . The shaded rectangle indicates the maximum power output. Performance; , , (FF) 0.52, efficiency: 2.5%. The intensity of simulated solar light transmitted through the ITO glass substrate was ; (c) spectral dependence of internal quantum efficiency of (closed dots) and absorption ratio of incident light by organic film (solid curve) for (b) cell.
(a) SEM image of a cross section of a film fabricated on a substrate heated at ; (b) morphological illustration of a cross section, drawn by tracing the image within the dotted box in (a).
Dependence of , and FF of the three-layered cells on thickness . ratio was 1:1.
energetic structure of the three-layered cell. The energetic relationships are precisely illustrated with respect to the scale bar. The in the codeposited layer is depicted using a broken line. Numerical values are energetic positions of levels for respective , , and NTCDA films before forming junction, which were estimated from the ionization potentials measured by atmospheric photoelectron emission analysis and from the optical band gaps.
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