A5055944740- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Perovskite Materials and Applications
- Photochemistry and Electron Transfer Studies
- Supramolecular Self-Assembly in Materials
- Advanced Polymer Synthesis and Characterization
- Bacterial biofilms and quorum sensing
- Biochemical and biochemical processes
- Polymer Surface Interaction Studies
- Porphyrin and Phthalocyanine Chemistry
- Hydrogels: synthesis, properties, applications
- Nanocomposite Films for Food Packaging
- Light effects on plants
- Antimicrobial agents and applications
- Luminescence and Fluorescent Materials
- Photochromic and Fluorescence Chemistry
University of Massachusetts Lowell
2019-2021
University of Massachusetts Amherst
2014-2020
Polymer solar cells fabricated in air under ambient conditions are of significant current interest, because the implications practicality such devices. However, only moderate performance has been obtained for air-processed Here, we report that enhanced short circuit density (JSC) and open voltage (VOC) poly(3-hexylthiophene) (P3HT)-based can be by using a series donor–acceptor dyes as third component device. Power conversion efficiencies up to 4.6% were upon addition which comparable...
A series of squaraine dyes was synthesized with electron-donating (OH, C6H13) and electron-withdrawing (F, CF3) groups allowing for tuning the optical electrochemical properties dyes. The squaraines exhibited strong absorbance (ε = 104–105 M–1 cm–1) at long wavelengths (λmax 660–690 nm), attributed to an intramolecular charge transfer (ICT). As character increases, red shifts band gap decreases. Interestingly, ICT seemed be strongly dependent on nature solvent, providing insights into...
A complete photophysical characterization of organic molecules designed for use as molecular materials is critical in the design and construction devices such photovoltaics (OPV). The nature a molecule's excited state will be altered employing same chromophoric units but possessing different architectures. For this reason, we examine reactions two BODIPY-based D-A A-D-A molecules, where D donor acceptor. BODIPY (4,4'-difluoro-4-bora-3a,4a-diaza-s-indacene) moiety serves component connected...
2,4-Bis[4′-(N,N-di(4″-hydroxyphenyl)amino)-2′,6′-dihydroxyphenyl]squaraine (Sq-TAA-OH, optical bandgap 1.4 eV, HOMO level −5.3 eV by ultraviolet photoelectron spectroscopy) is used as an active layer material in solution processed, bulk-heterojunction organic photovoltaic cells with configuration ITO/PEDOT:PSS/Sq-TAA-OH:PC71BM/LiF/Al. Power conversion efficiencies (PCEs) up to 4.8% are obtained a well-reproducible procedure using mixture of good and poor Sq-TAA-OH solubilizing solvents,...
Biomimetic systems that undergo macroscopic phase transformations by transducing and amplifying external cues are highly desirable for applications such as self-healing. Here, we report self-assembly of polyelectrolyte complexes into a vesicular structure can accommodate hydrophilic guest molecules, including enzymes. Triggered depolymerization one the molecules in complex causes vesicle to disassemble release its contents. Such triggered enzymes molecular-scale events be amplified due...
Perovskite solar cells (PSCs) have drawn extensive attention as promising next-generation photovoltaics due to their exceptional power conversion efficiency (PCE) and low fabrication cost over the past 10 years. However, poor stability remains biggest barrier for commercialization. Among many causes device degradation, inherent moisture instability of perovskite structure is one main reasons PSCs. In addition, chemical dopants used improve PCE further induce sensitivity Here, in this study,...
Thiophene-based conjugated polymers and oligomers have been widely used as active materials for the fabrication of optoelectronic devices such field-effect transistors, light-emitting photovoltaic cells. The optical electronic properties material depend on energy levels HOMO LUMO. In order to control levels, extensive studies aiming at modification oligothiophene backbone carried out. As an material, 3,4-ethylenedioxythiophene (EDOT) is important versatile building block molecular...
Complexes of Pd(btnbmtp)<TEX>$Cl_2$</TEX> and Pt(btnbmptp)<TEX>$Cl_2$</TEX> (btnbmtp = 2,5-bis(thiophen)-1-nonyl-3,4-bis(methylthio)- pyrrole) were prepared their crystal structures determined at room temperature. In the structures, two thiophene moieties lie in cis form with an average dihedral angle <TEX>$55.26^{\circ}$</TEX> to pyrrole frame. The luminescence properties free ligand complexes investigated solution solid states. compounds not favored by substituting frame, compared...