| dc.description.abstract | A series of new organic optoelectronic materials were synthesized and characterized for organic thin-film transistors (OTFTs), organic photovoltaic cells (OPVs), and perovskite solar cells (PSCs) applications.
For the OTFTs, dialkylated cyclopentadithiophene (CDTR)-based quinoidal compound, CDTRQ-12 (1), was synthesized and characterized. At the same time, the dithioalkylated methylidenyl cyclopentadithiophene (CDTS) core was developed and end-capped with two kinds of electron-withdrawing groups, such as dichlorodicyanomethylene indanone (INCl), and dicyanovinyl (DCV), via Knoevenagel condensation, to give new final compounds, INCl-CDTS (2) and DCV-CDTS (3), respectively.
For the OPVs, a new non-fullerene CDTS-based small molecule, IN-CDT-CDTS (4), was developed with an acceptor-π-donor-π-acceptor (A-π-D-π-A) structure. Whereas, CDTS was used as the central core, CDT served as π-spacer, and IN was utilized as the end capped groups. The above four newly developed materials can also be used as anti-solvents in PSCs to passivate the surface defects of perovskite films.
The optical and electrochemical properties (HOMO and LUMO) of these new materials were analyzed by UV-vis spectroscopy and DPV. Chemical structures were characterized by NMR and mass spectroscopy. Thermal properties were investigated by DSC and TGA. Optoelectronic devices using these newly developed small molecules are under optimization. | en_US |