Engineering topics
Marks, Tobin J.
Publications and source records attributed to Marks, Tobin J..
Processing Strategies for an Organic Photovoltaic Module with over 10% Efficiency
Abstract not provided
Aluminum metallic nanoparticle-polymer nanocomposites for energy storage
A nanoparticle composition comprising a substrate comprising a metal oxide component and an aluminum oxide component; and a metallocene olefin polymerization catalyst component coupled to the substrate is disclosed. The metal oxide component is homogenously dispersed throughout the nanocomposite composition.
Breath figure-derived porous semiconducting films for organic electronics
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Molecular-Scale Characterization of Photoinduced Charge Separation in Mixed-Dimensional InSe–Organic van der Waals Heterostructures
Layered indium selenide (InSe) is an emerging two-dimensional semiconductor that has shown significant promise for high-performance transistors and photodetectors. The range of optoelectronic applications for InSe can potentially be broadened by forming mixed-dimensional van der Waals heterostructures with zero-dimensional molecular systems that are widely employed in organic electronics and photovoltaics. Here, we report the spatially resolved investigation of photoinduced charge separation between InSe and two molecules (C 70 and C 8 -BTBT) using scanning tunneling microscopy combined with laser illumination. We experimentally and computationally show that InSe forms type-II and type-I heterojunctions with C 70 and C 8 -BTBT, respectively, due to an interplay of charge transfer and dielectric screening at the interface. Laser-excited scanning tunneling spectroscopy reveals a ~0.25 eV decrease in the energy of the lowest unoccupied molecular orbital of C 70 with optical illumination. Furthermore, photoluminescence spectroscopy and Kelvin probe force microscopy indicate that electron transfer from InSe to C 70 in the type-II heterojunction induces a photovoltage that quantitatively matches the observed downshift in the tunneling spectra. In contrast, no significant changes are observed upon optical illumination in the type-I heterojunction formed between InSe and C 8 -BTBT. Density functional theory calculations further show that, despite the weak coupling between the molecular species and InSe, the band alignment of these mixed-dimensional heterostructures strongly differs from the one suggested by the ionization potential and electronic affinities of the isolated components. Self-energy-corrected density functional theory indicates that these effects are the result of the combination of charge redistribution at the interface and heterogeneous dielectric screening of the electron–electron interactions in the heterostructure. In addition to providing specific insight for mixed-dimensional InSe–organic van der Waals heterostructures, this work establishes a general experimental methodology for studying localized charge transfer at the molecular scale that is applicable to other photoactive nanoscale systems.
Inorganic-Organic Hybrid Thin-Film Transistors Using Inorganic Semiconducting Films
Inorganic semiconducting compounds, composites and compositions thereof, and related device structures.
Inorganic-organic hybrid thin-film transistors using inorganic semiconducting films
Inorganic semiconducting compounds, composites and compositions thereof, and related device structures.
Crosslinked polymeric dielectric materials and electronic devices incorporating same
Solution-processable dielectric materials are provided, along with precursor compositions and processes for preparing the same. Composites and electronic devices including the dielectric materials also are provided.
Gate-planarized thin film transistor substrates and related methods of fabrication
Thin film transistor substrates with conductor components in conjunction therewith, and related methods of fabrication.
Inorganic-organic hybrid thin-film transistors using inorganic semiconducting films
Inorganic semiconducting compounds, composites and compositions thereof, and related device structures.
Carbonyl-functionalized thiophene compounds and related device structures
Carbonyl-functionalized oligo/polythiophene compounds, and related semiconductor components and related device structures.
High-performance field effect transistors with self-assembled nanodielectrics
Field effect transistor devices comprising III-V semiconductors and organic gate dielectric materials, such dielectric materials as can afford flexibility in device design and fabrication.
Carbonyl-functionalized thiophene compounds and related device structures
Carbonyl-functionalized oligo/polythiophene compounds, and related semiconductor components and related device structures.