| dc.description.abstract | A number of small molecular organic semiconductors have been designed and synthesized for
various organic electronics device applications such as organic field-effect transistors (OFETs),
dye-sensitized solar cells (DSSCs), and perovskite solar cells (PSCs). The optical, and
electrochemical properties of these newly synthesized materials were examined using differential
pulse voltammetry (DPV), and UV-Visible absorption spectroscopy. Thermal properties were
investigated by differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA).
Thin-film microstructure and film morphology were examined by X-ray diffraction, atomic force
microscopy (AFM), and grazing incidence X-ray diffraction (GIXRD) to understand the
relationship between the molecular structure, film morphology/crystallinity, and device
performance. The molecular structures of organic semiconductors and their molecular packing
properties were determined by single-crystal X-ray diffraction. In this research, air-processed
TIIQ-b16 OFETs exhibit electron mobility up to 2.54 cm2 V
−1
s
−1 with a current ON/OFF ratio of
105–106
exhibiting unipolar electron transport characteristics and enhanced ambient stability.
DFPT-DTTR compound based OFETs exhibit efficient hole transport mobility up to 0.48 cm2 V
−1
s
−1
. Non-fullerene acceptor (INBrBCDT-b8) was used as an anti-solvent in PSCs yielding an
excellent PCE of up to 22.20% with FF of 79%, a JSC of 24.44 mA cm-2
, and a VOC of 1.15 V, also
effectively passivate surface defects and enhance charge transport at the device interface. Further,
maleimide-based HTM (MLIBP’-4D) with tetra-substituted triphenylamine donors exhibits highperformance PCE reaching up to 21.20 % in PSCs. Several conjugated quinoidal compounds,
organic dyes, and hole-transporting materials (HTMs) have been synthesized for OFETs, DSSCs,
and PSCs, respectively. Presently, device characterization and optimization of these newly
developed small molecules are in progress for future publications. | en_US |