TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation is given. Preferred Composition: The fused ring compound (I) is of formula (I-A) or (I-B). The fused ring compound (II) is of formula (II-A) or (II-B).La-Lc=L;andR'a.R'b,R'c=R.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The coating solution further comprises polymer binder. SPECIFIC COMPOUNDS - 64 Fused ring compounds are disclosed e.g. 7,18-dioctyl-8,11,19,22-tetrathiahexacyclo(10.10.0.02,10.05,9.013,21.016,20)docosa-1(12),2(10),3,5(9),6,13(21),14,16(20),17-nonaene of formula (Ia), 7,18-didodecyl-8,11,19,22-tetrathiahexacyclo(10.10.0.02,10.05,9.013,21.016,20)docosa-1(12),2(10),3,5(9),6,13(21),14,16(20),17-nonaene, 6,17-bis(5-octylthiophen-2-yl)-8,11,19,22-tetrathiahexacyclo(10.10.0.02,10.05,9.013,21.016,20)docosa-1(12),2(10),3,5(9),6,13(21),14,16(20),17-nonaene, 7,18-bis(4-octylthiophen-2-yl)-8,11,19,22-tetrathiahexacyclo(10.10.0.02,10.05,9.013,21.016,20)docosa-1(12),2(10),3,5(9),6,13(21),14,16(20),17-nonaene, and 7,18-bis(5-octylthiophen-2-yl)-8,11,19,22-tetrathiahexacyclo(10.10.0.02,10.05,9.013,21.016,20)docosa-1(12),2(10),3,5(9),6,13(21),14,16(20),17-nonaene.    EXAMPLE - 0.70-g (2-(5-Nonyl-2-(5-(5-nonyl-3-(2-(tris(propan-2-yl)silyl)ethynyl)thiophen-2-yl)thieno(3,2-b)thiophen-2-yl)thiophen-3-yl)ethynyl)tris(propan-2-yl)silane was added to tetrahydrofuran solution of 15 mL fluorinated tetra-n-butylammonium, heated at 60 degrees C for 1 hour, distilled water was added to the resulting mixture, and organic layer was extracted to obtain 3-ethynyl-2-(5-(3-ethynyl-5-nonylthiophen-2-yl)thieno(3,2-b)thiophen-2-yl)-5-nonylthiophene. 0.42 g 3-Ethynyl-2-(5-(3-ethynyl-5-nonylthiophen-2-yl)thieno(3,2-b)thiophen-2-yl)-5-nonylthiophene and toluene solution of 0.038 g platinum(II) chloride were heated at 90 degrees C by nitrogen atmosphere for 12 hours, distilled water was added to the resulting mixture, organic layer was extracted using chloroform, and obtained solids were separated by silica gel chromatography to obtain 7,18-dioctyl-8,11,19,22-tetrathiahexacyclo(10.10.0.02,10.05,9.013,21.016,20)docosa-1(12),2(10),3,5(9),6,13(21),14,16(20),17-nonaene with yield of 47%.