The Research And Application Of Polycyclic Aromatic Hydrocarbons Materials In Solar Cell

Consecutive explorations on polycyclic aromatic hydrocarbons(PAHs) as the central blocks of organic photosensitizers have very recently brought forth a new opportunity towards efficiency enhancement of dye-sensitized solar cells(DSCs). Through rational design and efficient synthesis on polycyclic aromatic hydrocarbons(PAHs) organic dye molecules, a series of novel core and organic dye based on PAHs have been prepared, achieving promotion on metal-free organic dye device performance.(1) To scrutinize the effects of ancillary electron-donors on light absorption and charge recombination in phenanthrocarbazole(PC) dye-sensitized solar cells, we synthesized three dyes with the respective pristine PC.With respect to the reference dye only using PC as the electron-donor, attaching an ancillary electron-donor, 2-hexyldecyl tethering fluorenyl or carbazyl, to the free end of PC can result in a destabilized highest occupied molecular orbital energy level and a red-shifted absorption peak as well as an enhanced maximum molar absorption coefficient. The end-capping of PC with fluorenyl or carbazyl can also slow down the kinetics of charge recombination of titania electrons with both cobalt(III) ions and photooxidized dye molecules, giving rise to an enlarged photovolatge and an improved power conversion efficiency.(2) We introduce the rich electronic thiophene to the groups of donor unit, by the reaction of intramolecular alkylation of thiophene ring to build a kernel module based on the rigid Thienochrysenocarbazole(TCC) electron-donor as a new type of organic dye molecules C282、C283、C284、C285, withBTBA and EBTBA acceptors and side modified groups to adjust the level of molecules and the three-dimensional structure. Device characterization datas and relevant physical and electronic tests show that, by the reasonable regulation of level and stereoscopic structure, C284 exhibits superior performance that the photoelectric conversion efficiency is above 13% with the excellent integral of current value up to 20.17 mA cm-2, open circuit voltage of 867 mV and fill factor of 0.746.