| dc.description.abstract | A series of new organic optoelectronic materials based on dicyclopentadithienothiophene (DCDTT) were developed and characterized for the applications in organic photovoltaics (OPVs).
Highly fused thiophene-based seven-ring core (DCDTT) was end-capped with various electron-withdrawing groups, such as brominated dicyanomethylene indanones (INBr2, -INBr, and -INBr) and dicyanovinyl (DCV), via Knoevenagel condensation to obtain new final compounds, INBr2-DCDTT (1), -INBr-DCDTT (2), -INBr-DCDTT (3), and DCV-DCDTT (4), respectively.
These newly developed compounds are expected to perform well as non-fullerene acceptors in OPVs as well as in perovskite solar cells (PSCs). The power conversion efficiency of the reported INBr2-DCDTT-based perovskite film has been raised from 17% to 21.39% in PSCs. The presence of carbonyl (C=O) and cyano (C≡N) groups have a good interaction with undercoordinated Pb2 ions and passivate the trap states in the perovskite films; thus, it enhances charge transport at the device interface. The related study has been published on Journal of Materials Chemistry A in April, 2022.
The chemical structures of these newly developed materials were characterized by NMR spectroscopy and mass spectrometry. Further, the optical properties of these compounds were investigated by UV-Vis spectroscopy, electrochemical analyses were analyzed by DPV, and the thermal stabilities were determined by DSC and TGA. Optoelectronic devices made from these newly developed small molecules are under optimization. | en_US |