| dc.description.abstract | A series of new organic optoelectronic materials were synthesized and characterized for organic thin film transistors (OTFTs), organic photovoltaic cells (OPVs), hole transporting layer (HTL) and dye sensitized solar cell (DSSC).
For the OTFTs, n-type DTPQ-b8 (DTP with b-C8H17 chains) and DTPQ-b16 (DTP with b-C16H33 chains) exhibited mobility of 0.65 cm2V-1s-1 and 2.54 cm2V-1s-1. To further complete the side chains effect study, DTPQ-10 (1; R= C10H21), DTPQ-b17 (2; R= b-C17H35) and DTP’Q-8 (3; R= b-C16H33, C8H17) was synthesized and characterized. Single-crystal X-ray diffraction of DTPQ-b16 reveals the planarity of DTP core via the intramolecular S···O interaction. DTP showed brick-type face to face molecular stacking, with a short intermolecular stacking distance of 3.28 Å and short intermolecular N···H contacts of 2.52 Å. Furthermore, two new DTP-based hole transporting molecules were developed where the DTP core were end-capped with triphenylamino (TPA) unit. TPA-DTP-2 (4) exhibits the PCE up to 9.6% in Pb-based PSC.
For the organic photovoltaics, one new core of a CDT-based, the dimerized CDT (BCDT), were developed. Via knoevenagel condensation, the new BCDT core were end-capped with electron withdrawing groups, such as rhodanine (Rh) or indane-1,3-dione (IN) to afford two new small molecules INBCDT (6) and RhBCDT (7).
For DSSC, a new organic dye TPA-SBT6-A (8) were synthesized. Co-sensitization of TPA-SBT6-A (8) with Ru-based dyes exhibits the PCE up to 9.8% in dye sensitized solar cell.
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.
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