TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. Preferred Composition: The naphthalene derivative (1-1) or (1-2) is preferably of formula (2-1) or (2-2).R1-R4=H or substituents, preferably 1-12C alkyl, 2-12C alkynyl, 2-12C alkenyl, 6-12C aryl, 1-12C alkoxy, 1-12C alkylthio (all optionally substituted), H or fluoro;La-Ld=bivalent coupling groups (L-1)-(L-12) or bivalent coupling group in which two or more bivalent coupling group (L-1)-(L-12) are bonded, preferably all La-Ld are bivalent coupling group (L-1) or (L-10);andRa-Rd=alkyl, trialkylsilyl (both optionally substituted), oligo siloxane having 2 or more silicon atoms, or oligo oxyethylene having two or more of number repeating number of oxyethylene unit, preferably all Ra-Rd are linear alkyl.(i) When La and Lb are group (L-1) and Ra is optionally substituted alkyl, carbon number of principal chain is three or more; (ii) When La and Lb are group (L-2) or (L-3), carbon number of principal chain is two or more; (iii) When La and Lb are group (L-4)-(L-12), carbon number of principal chain is four or more; (iv) When La or Lb adjacent to Ra or Rb is bivalent coupling group (L-3), Ra and Rb are optionally substituted trialkylsilyl; (v) When Lc and Ld are group (L-1) and Rc is optionally substituted alkyl, carbon number of principal chain is three or more; (vi) When Lc and Ld are group (L-2) or (L-3), carbon number of principal chain is two or more; (vii) When Lc and Ld are group (L-4)-(L-12), carbon number of principal chain is four or more; and (viii) When Lc or Ld adjacent to Rc or Rd is bivalent coupling group (L-3), Rc and Rd are optionally substituted trialkylsilyl.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The coating solution and organic-semiconductor thin film further contain polymer binder. Preferred Process: The organic-semiconductor thin film is produced using solution coating method. EXAMPLE - 7.9 g copper(II) bromide was added at 100 degrees C, then 220 ml acetonitrile and 7.3 g polyethyleneglycol 200 were added at room temperature, stirred for 30 minutes, 3 ml isoamyl nitrite was dripped, 200 ml N,N-dimethylacetamide solution of 2 g naphtho(1,2-d;5,6-d')bisthiazole-2,7-diamine was dripped, stirred for 2 hours, obtained reaction liquid was added in 1 N hydrochloric acid, solid was filtered, filtered material was dissolved in chloroform, filtrate was concentrated by reduced pressure, and silica gel column-chromatography purification of concentration residue was carried out, to obtain 1.9 g 2,7-dibromo-naphtho(1,2-d;5,6-d')bisthiazole.