... Vol. 18, No.9, (September 1 980 ), pp. 286 9- 287 3, ISSN 1099-05 18 Lior, N. (20 08) . Energy resources and use: The present situation and possible paths to the future. Energy, Vol.33, No.6, (June 20 08) , ... properties. Polyfluorene, however, has a band gap of ~3.0eV, which limits its application in Solar Cells – New Aspects and Solutions 4 78 M Zn(CH2COO) and 0.1 M Na2S aqueous solution for ... No.4, (April 2007), pp. 1324-13 38, ISSN 1520- 689 0 Solar Cells – New Aspects and Solutions 462 Chart 4. 3-substituted thiophene dimer isomers, regioregular P3HT and regioirregular P3HT Regioregular...