NOVELTY - Manufacturing a capacitor, comprises providing an electrode body (1) of an electrode material (2), where a dielectric (3) covers a surface (4) of the electrode material to partially form an anode body (5), introducing a dispersion, comprising a dispersing agent and complexes of polythiophenes and polyanions, in a portion of the anode body, where a weight ratio of the polythiophenes and polyanions is 0:5, and partially removing the dispersion to obtain a solid electrolyte (6) in a capacitor body.    USE - The method is useful for manufacturing a capacitor such as an aluminum winding capacitor, a tantalum electrolytic capacitor and an aluminum stacked capacitor, which is useful in an electronic circuit and an organic solar cell (all claimed), where the electronic circuit is useful in: computer (desktop, laptop, server); computer peripheral equipment (personal computer cards); portable electronic devices such as mobile phones, digital cameras and consumer electronics; CD/DVD players and video game consoles; navigation systems; telecommunications; household appliances; and medical technology such as defibrillators.    ADVANTAGE - The method is capable of efficiently manufacturing the capacitor with high reliability and good performance.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a capacitor obtainable by the method;    (2) producing a dispersion comprising a dispersing agent and complexes of polythiophenes and polyanions, comprising performing oxidative polymerization of thiophene monomers in the presence of polyanions in dispersion containing suspended liquid reaction phase, where thiophene monomers and the polyanions are used in relative amounts that the weight ratio of thiophene monomers:polyanions in the liquid reaction phase is greater than 0.5;    (3) dispersion obtained by the method;    (4) producing an organic solar cell comprising coating a substrate layer, a transparent anode layer, a semiconductor layer and a cathode layer with the dispersion, and removing the dispersion; and    (5) an organic solar cell obtained by the method.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a part of a capacitor.    Electrode body (1)    Electrode material (2)    Dielectric (3)    Surface of electrode material (4)    Anode body (5)    Solid electrolyte. (6)