Organic photosensitive optoelectronic devices are disclosed which include an exciton blocking layer to enhance device efficiency. The axes are substantially parallel to an axial direction and substantially perpendicular to lateral and vertical directions. The functional layer is formed by crystallizing an amorphous silicon layer, with laser beam irradiation. When a copy of the copy-protected material is subsequently returned, or checked-in to the providing source, the usage allocation associated with this copy is returned to the total-usage-value.