TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The transistor further comprises a gate electrode (14) on a substrate (12); a source electrode (17a) and a drain electrode (17b) on the substrate, where the source electrode and the drain electrode are facing each other and defining a channel region; an insulation layer (16) on the substrate, where the insulation layer is electrically insulating the source electrode, the drain electrode, and the gate electrode; and an active layer (18) comprising (I), where the active layer is placed between the source electrode and the drain electrode. The polymer has a number average molecular weight of 5000-200000. The polymer is a p-type organic semiconductor polymer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No preparation method is given. Preferred Definitions:    R1-R6 = thiazolyl, thiadiazolyl, isoxazolyl, oxadiazolyl, imidazolyl, pyrazolyl, trizolyl, tetrazolyl, pyridyl, pyridazinyl, quinolinyl, isoquinolinyl, quinoxalinyl, naphthyridinyl, benzoimidazolyl, pyrimidopyrimidinyl, benzothiadiazolyl, benzoselenadiazolyl, benzotriazolyl, benzothiazolyl, benzoxazolyl, phenanthrolinyl, phenazinyl or phenanthridinyl; and    R7, R8 = thiophenyl or R1.    SPECIFIC COMPOUNDS - 1 Compound (I) is disclosed i.e. 2,6-di-tert-butyl-4,8-di(2-thienyl)-pyreno(4,5-b:9,10-b')dithiazole of formula (Ia).    EXAMPLE - Lawesson's reagent (19.6 g) was added to a stirred solution of N,N'-(5,10-dibromo-2,7-di-tertbutylpyren-4,9-diyl)dithiophene-2-carboxamide (7 g) in tetrahydrofuran and toluene. The reaction mixture was agitated while refluxing overnight. After the reaction was complete, it was cooled to room temperature (24 degrees C) and evaporated under a reduced pressure. The crude solid was suspended in diethyl ether and stirred for 30 minutes. The resultant was filtered and dried to give N,N'-(5,10-dibromo-2,7-di-tert-butylpyrene-4,9-diyl)dithiophene-2-carbothioamide (7.3 g). Cesium carbonate (9.3 g) was added to a stirred solution of N,N'-(5,10-dibromo-2,7-di-tert-butylpyren-4,9-diyl)dithiophene-2-carbothioamide (7.2 g) in dimethylformamide (120 ml). The reaction mixture was heated at 120 degrees C for 3 hours. After the reaction was complete, it was cooled to room temperature (24 degrees C) and water was added. The precipitate was filtered and washed with dichloromethane to obtain 2,6-di-tert-butyl-4,8-di(2-thienyl)-pyreno(4,5-b:9,10-b')dithiazole (4.5 g).