Date : 2011. 10. 20, 5:00 PM Place : Magam Hall, Bldg.500 -Abstract-    Solution processed organic solar cells based on bulk-heterojunction (BHJ) materials comprising of small molecule chromophores and fullerene derivatives have offered special opportunities showing their promising power-conversion efficiencies (PCE) of above 4% as attractive alternatives to p-conjugated (semiconducting) polymers. Although the BHJ devices fabricated by small molecule chromophore present lower efficiency than ~7% of that by polymer, these approaches by small molecule seem to fascinate more than polymer from the viewpoint of mass production for commercial application due to their low reproducibility for characteristics such as average molecular weight(Mw) and polydispersityindex(PDI) as well as difficulty in purification. We have also focused on the development of new chromophores for small molecule BHJ solarcell, which are motivated by organic dyes in dye-sensitized solarcell(DSSC) and push-pull chromopor -es in nonlinear optics(NLO) due to a strong structural similarity with small molecule chromophores reported in BHJ solar cell.