Conjugated copolymers of dithienothiophene with vinylene or acetylene are suitable for use as semiconductors or charge transport materials in optical, electrooptical or electronic devices including field effect transistors, electroluminescent, photovoltaic and sensor devices. The surface of the semiconductor is first coated with a protective layer, which is later thinned to selectively reveal portions of the protruding defects. There is an inner liner inside the carton, and a hinged top lid attached to the chamfered panel. The interface between each tile defines a boundary.