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The article offers information on the use of hybrid electrodes with a combination of ultratransparent poly(3,4-ethylenedioxythiophene) : poly(styrenesulfonate) (PEDOT:PSS) and an evaporated semitransparent silver (Ag) grid for small-molecule organic solar cells. Topics discussed include electrical and optical properties as well as excellent mechanical flexibility of indium-tin oxide (ITO), performance of Organic photovoltaic (OPV) cells and characteristics of various electrodes.

The great potential of solution-processed metal nanowire networks utilized as a transparent electrode has attracted much attention in the last years. Typically, silver nanowires are applied, although their replacement by more abundant and cheaper materials is of interest. Here, a hydrazine-free synthesis route for high aspect ratio copper nanowires is used to prepare conductive networks showing an enhanced electrode performance. The network deposition is done with a scalable spray-coating process on glass and on polymer foils. By a pressing or an annealing step, highly conductive transparent electrodes are obtained, and they reveal transmittance-resistance values similar to indium tin oxide (ITO) and networks made of silver nanowires. The application potential of the copper nanowire electrodes is demonstrated by integrating them into an evaporated small-molecule organic solar cell with 3% efficiency. [ABSTRACT FROM AUTHOR]

n‐Doped C60 is reported as a new electrode material for indium‐tin‐oxide‐free organic solar cells. All layers from the bottom to top electrode are prepared in one step in a vacuum chamber. The organic solar cells based on the n‐C60 electrodes assisted by a semitransparent metal grid exhibit efficiencies as high as 2.9%. [ABSTRACT FROM AUTHOR]