Highly conducting conjugated organic polymers have stimulated great interest and are now finding important applications. However, despite much recent research, the structure and conducting mechanism of these polymers as well as the way in which the polymers are built up are in general still poorly understood. This article describes a new line of attack: a detailed examination of the mechanism by which the solid polymer phase is built up from polymers dispersed in solution, revealing that the nucleation and growth may be two or three dimensional.