| 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 hole transporting layer (HTL).
For n-type OTFTs, n-type small molecules, DPP’Q-10 (1; R= b-C20H41, C10H21) and DPP’Q-14 (2; R= b-C20H41, C14H29), were synthesized and characterized. DPP is a superior core for OTFT, since the planar core structure, electron deficient nature, and ability to form hydrogen bonds, resulting in strong π-π stacking interactions. Two new DPP-based small molecules, DPP’Q-10 (1) and DPP’Q-14 (2), with the asymmetrical side chains were developed. The replacement of bulky branching chains with linear ones should reduce the steric hindrance of the long alkyl chains, which might lead to the improvement of alkyl chain packing order, thin film crystallinity, and therefore, the charge mobilities.
On the other hand, a new bisthiophene-fused diketopyrrolopyrrole unit, BTI, was synthesized by microwave, which will be served as a new core in organic thin film transistors in the future.
For the organic photovoltaics, One CDT derivative, BCDT, was served as a central core and was end capped with electron withdrawing groups, such as rhodamine (Rh) or dicyanomethylene indanone (IN). Via knoevenagel condensation, two new materials RhBCDT (3) and INBCDT (4) were prepared.
For hole transporting layer materials, a DPP-based small molecular TPA-DPP-b8 (5) was synthesized, which will be tested in Pb-based perovskite solar cells for power conversion efficiency improvement.
iv
The optical and electrochemical properties (HOMO and LUMO) of these new materials were characterized by UV-vis and DPV. Thermal properties were investigated by DSC and TGA. Optoelectronic devices used these new developed small molecules are under optimization. | en_US |