Optical, electrical and technological as­pects have to be considered for reasonable choice of the shape and dimensions of the microstructure. Calculations considering geometric — and wave-optical aspects for a prismatic structure are presented in section "micro prisms — optical simulations".

The deposition of organic thin films from solution by spin-coating or dip-coating is strongly dependent on the structure dimen­sions, the viscosity, the adhesion and co­hesion forces and the deposition process.

Same film thickness as for the planar solar cell architecture should be aspired on the Figure 2: Cross section of a replicated mi — micro prism substrate, following the shape of cro prism structure (SEM-Image)

the structure as precise as possible. The

lattice distance of the microstructure is mainly restricted by the conductivity of the p — conducting polymer film (PEDOT CPP105d). An optimum period of the prism structure is obtained by electrical calculations presented here. First investigations were undertaken on retroreflecting prismatic structures with a groove angle of 90° and a period of 100^m.