摘要:
The novel pi-conjugated polymers, poly(N-(3,4-bis(decyloxy) phenyl) carbazolyl-2,7-vinylene) (PCzV) and poly[N-(3,4-bis(decyloxy) phenyl) carbazolyl-2,7-vinylene)-co-{2-methoxy- 5-(2-ethylhexyloxy)-1,4-phenylenevinylene}] (PCzV-co-MEH-PPV) were synthesized by using the Gilch polymerization method and their photovoltaic properties were investigated. The newly designed and highly branched polymers, formed from PCzV and PCzV-co-MEH-PPV, are soluble in common organic solvents and easily spin-coated onto indium-tin oxide (ITO) coated glass substrates.The weight-average molecular weights (M(w)) and the polydispersity of the polymers were determined to be in the ranges of 3.86-7.9 x 10(4) and 1.60-2.05, respectively. Bulk-heterojunction solar cells, with ITO/PEDOT: PSS/polymer: PC(61)BM/TiO(x)/Al configurations, were fabricated. The solar cell based on PCzV-co-MEH-PPV: PC(61)BM (1:6 wt/wt) displays a higher photovoltaic performance as compared to that produced from PCzV: PC61BM (1: 6 wt/wt). The bulk-heterojunction solar cell with PCzV-co-MEH-PPV: PC61BM (1: 6 wt/wt) has a power conversion efficiency (PCE) of 2.31% (J(sc) = 6.43 mA/cm(2), V(oc) = 0.82 V, FF = 44%), measured using an AM 1.5 G solar simulator at 100 mW/cm(2) light illumination. (C) 2010 Elsevier B. V. All rights reserved.