TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. Preferred Compound: The oligomer is preferably 5-fluoro-4-(17-(5-fluoro-7-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)-2,1,3-benzothiadiazol-4-yl)-2,12-bis((2-(tris(propan-2-yl)silyl)ethynyl))-6,18-dithiapentacyclo(11.7.0.03,11.05,9.015,19)icosa-1(13),2,4,7,9,11,14,16,19-nonaen-7-yl)-7-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)-2,1,3-benzothiadiazole or 5-fluoro-4-(17-(5-fluoro-7-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)-2,1,3-benzoselenadiazol-4-yl)-2,12-bis((2-(tris(propan-2-yl)silyl)ethynyl))-6,18-dithiapentacyclo(11.7.0.03,11.05,9.015,19)icosa-1(13),2,4,7,9,11,14,16,19-nonaen-7-yl)-7-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)-2,1,3-benzoselenadiazole. Preferred Layers: The semiconductor layer and conducting layer are photoactive. The electronic device comprises a single layer, a bi-layer, a multilayered stacking or a bulk heterojunction active layer. The photovoltaic cell has a substrate and semiconductor or conducting layer provided between electrodes. The substrate is a rigid substrate or flexible substrate. The photovoltaic cell is a bulk heterojunction photovoltaic cell. The semiconductor or conducting layer is provided on the substrate or the electrode by spray coating, ultrasonic spray coating, roll-to-roll coating, drop casting, dip coating, gravure coating, slot die coating, doctor blade coating, spin coating, meniscus coating, transfer printing, ink-jet printing, offset printing or screen printing process. The conducting layer is provided on the substrate or electrode by vacuum deposition or organic vapor phase deposition (OVPD), solution precipitation, organic molecular beam deposition, or vacuum thermal evaporation. The vacuum deposition is vacuum thermal deposition. EXAMPLE - 196 mg 4-Bromo-5-fluoro-7-(5-(5-hexylthiophen-2-yl)thiophen-2-yl)-2,1,3-benzothiadiazole, 200 mg 2,8-bis(trimethylstannyl)-5,11-bis(triisopropylsilylethynyl)-anthra-(2,3-b:6,7-b')dithiophene and 2,8-bis(trimethylstannyl)-5,11-bis(triisopropylsilyl-ethynyl)anthra(2,3-b:7,6-b')dithiophene and 15 mL tetrahydrofuran were mixed and stirred at room temperature for 15 minutes. The reaction mixture was heated to 100 degrees C for 2 minutes, 140 degrees C for 10 minutes, 150 degrees C for 12 minutes and 160 degrees C for 15 minutes. After cooling the reaction mixture to room temperature, the crude product mixture was then added to aqueous solution of sodium diethyldithiocarbamate and stirred for 12 hours at room temperature. The organic layer was separated and volatiles were removed to obtain crude product as a dark brown powder. The resulting compound was purified to produce 2,8-bis(5-fluoro-7-(5'-hexyl-(2,2'-bithiophene)-5-yl)benzo(c)(1,2,5)thiadiazole)-5,11-bis(triisopropylsilylethynyl)anthra(2,3-b:6,7-b')dithiophene and 2,8-bis(5-fluoro-7-(5'-hexyl-(2,2'-bithiophene)-5-yl)benzo(c)(1,2,5)thiadiazole)-5,11-bis(triisopropylsilylethynyl)anthra(2,3-b:7,6-b')dithiophene with yield of 70%.