Substituted pentacene semiconductors

A substituted pentacene compound comprising at least one substituent selected from the group consisting of alkyl groups, alkoxy groups, thioalkoxy groups, halogen substituents, and combinations thereof;

• said substituent(s) each being bonded to at least one carbon atom of pentacene selected from the number 1, 2, 3, 4, 8, 9, 10, and 11 carbon atoms, and being the only substituent(s);
• with the proviso that when said compound has only two said substituents, both of which are methyl or alkoxy, and one said substituent is bonded to said number 2 carbon atom, the other said substituent, if methyl, is bonded to said number 1, 3, 4, 8, or 11 carbon atom and, if alkoxy, is bonded to said number 1, 3, 4, 8, 9, or 11 carbon atom;
• and with the further proviso that when said compound has only four said substituents, all of which are alkoxy, said substituents are bonded to said numbers 2, 3, 9, and 10 carbon atoms.