| 초록 |
The small molecular (EH-BDT(DTDFDDoQx)2, EH-BDT(DTDFDHexQx)2, Oct-BDT(DTDFDDoQx)2, Oct-BDT(DTDFDHexQx)2) showed similar λmax in solution (475, 471, 475 and 468 nm) and in film (538, 536, 538 and 540) state. And similarly other series, bathochromic shift was taken in film state (about 65 nm~70nm). EH-BDT(DTDFDDoQx)2, EH-BDT(DTDFDHexQx)2, Oct-BDT(DTDFDDoQx)2 and Oct-BDT(DTDFDHexQx)2 had same backbone except for alkyl chain, so this series showed similar electrochemical properties, but they showed some difference in HOMO energy level. In case that ethyl-hexyl group was substituted on BDT backbone (EH-BDT(DTDFDDoQx)2, EH-BDT(DTDFDHexQx)2), It had more deep HOMO energy level (-5.38, -5.35) than octyl chain substituted on BDT backbone. (Oct-BDT(DTDFDDoQx)2, Oct-BDT(DTDFDHexQx)2; -5.27, -5.29) These small molecular series, the PCE was measured 0.23 ~ 0.62%. Among them, EH-BDT(DTDFDDoQx)2 having more long alkyl chain in Qx unit and bulky side chain in BDT unit showed highest PCE 0.62%. |
