| dc.description.abstract | A series of new organic optoelectronic materials were synthesized and characterized for organic photovoltaic cells (OPVs), organic thin film transistor (OTFT) and hole transporting layers (HTLs).
Two new dithienopyrrole (DTP) cores were developed for OPVs. First, DTP core was end-capped with a thioalkylated thiophene unit to give more conjugated TSDTP. Second, the DTP core was dimerized to give more conjugated BDTP. To enhance the solubility of the new DTPs, b-C16H33 and b-C20H41 were introduced in the DTP cores. Then, the above four cores were formylated and then end-capped with two electron withdrawing groups, IN and INCl, to give IN-TSDTP-b16 (1), IN-TSDTP-b20 (2), INCl-TSDTP-b16 (3), INCl-TSDTP-b20 (4), IN-BDTP-b16 (5), IN-BDTP-b20 (6), INCl-BDTP-b16 (7), and INCl-BDTP-b20 (8).
Furthermore, BDTP-based quinoid, BDTPQ-b16 (9), was synthesized for OTFT application.
Finally, three new DPT-based HTLs with three different chains, b-C8H17, b-C16H33, and b-C20H41, were synthesized to give DTP-2D-b8 (10), DTP-2D-b16 (11), and DTP-2D-b20 (12), respectively. Currently, DTP-2D-b8 and DTP-2D-b16 based pervoskite solar cell exhibit power conversion efficiency of 13.60% and 13.91%, respectively.
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 |