| 초록 |
Organic photovoltaic (OPV) devices provide a promising way to utilize the solar energy efficiently while maintaining low cost. 6-(2-thienyl)-4H-thieno[3,2-b]indole (TTI) was modified from partial benzene ring in carbazole moiety. Therefore TTI unit was also expected to have strong electron donating ability likewise original moiety. TTI unit was expected to have high charge transport. The PTTIDTBT-h and PTTIDTMBI and PTTIDPP were synthesized through Stille coupling reaction and estimated in OPVs. The band gaps of PTTIDTBT-h and PTTIDTMBI and PTTIDPP using the UV onset rate of the λmax are shown 594 nm, 682 nm and 759 nm, respectively. The HOMO and LUMO energy levels of PTTIDTBT-h and PTTIDTMBI and PTTIDPP were presented at -5.31 and -3.7 eV, -5.20 and -3.7 eV, -5.09 eV and -3.7 eV, respectively. The small molecules have great thermal stability. The device including PTTIDTMBI with PCBM (1:3) showed a power conversion efficiency value of 1.44%. |
