| 초록 |
Two new polymers based on quinoxaline, poly[1,5-didecyloxynaphthalene-alt-5,5′-(5,8-dithiophen-2-yl)-2,3-bis(4-octyloxyphenyl)quinoxaline (PNQx-p) and poly[1,5-didecyloxynaphthalene-alt-5,5′-(5,8-dithiophen-2-yl)-2,3-bis(4-octyloxyphenyl)quinoxaline (PNQx-m), were synthesized by Suzuki coupling reaction. Optical, thermal and electrical properties of the polymers were investigated by UV ab-sorption, photoluminescence, TGA and cyclic voltammetry. PNQx-p and PNQx-m have comparable optical band gap (~2eV) and almost similar deep HOMO energy levels (-5.59 and -5.61eV, respectively). The device of PNQx-m blended with PC71BM(1:2) showed the best power conversion efficiency(PCE) of 2.29% with an open-circuit voltage of 0.93V. The PCE of PNQx-m:PC71BM(1:2) was improved to 2.95% by using 1,8-diiodoocane(0.25% v/v) as an additive. |
