Dennice Roberts

Dennice Roberts
University of Colorado Boulder | CUB · Department of Mechanical Engineering (ME)

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16
Publications
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163
Citations

Publications

Publications (16)
Article
Full-text available
Power electronics are critical for a sustainable energy future, playing a key role in electrification and integration of renewable energy sources into the grid. Advances in ultrawide band gap materials are needed to handle higher powers in smaller form factors while reducing electrical and thermal losses. High Al content Al x Ga 1 − x N is theoreti...
Article
We couple halide vapor phase epitaxy (HVPE) growth of III–V materials with liftoff from an ultrathin carbon release layer to address two significant cost components in III–V device - epitaxial growth and substrate reusability. We investigate nucleation and growth of GaAs layers by HVPE on a thin amorphous carbon layer that can be mechanically exfol...
Preprint
Full-text available
Al_xGa_{1-x}N$ is a critical ultra-wide bandgap material for optoelectronics, but the deposition of thick, high quality epitaxial layers has been hindered by a lack of lattice-matched substrates. Here we identify the (111) face of transition metal carbides as a suitable class of materials for substrates lattice matched to (0001) $Al_xGa_{1-x}N$ and...
Article
Full-text available
The approaching end of Moore's Law scaling has significantly accelerated multiple fields of research including neuromorphic-, quantum-, and photonic computing, each of which possesses unique benefits unobtained through conventional binary computers. One of the most compelling arguments for neuromorphic computing systems is power consumption, noting...
Article
Nanoscale superlattices represent a compelling platform for designed materials as the specific identity and spatial arrangement of constituent layers can lead to tunable properties. A number of kinetically-stabilized, non-epitaxial superlattices with almost limitless structural tunability have been reported in telluride and selenide chemistries but...
Preprint
Nanoscale superlattices represent a compelling platform for designed materials as the specific identity and spatial arrangement of constituent layers can lead to tunable properties. A number of kinetically-stabilized layered chalcogenide nanocomposites have taken inspiration from misfit compounds, a thermodynamically stable class of materials forme...
Article
Two-dimensional sulfides and their heterostructures have emerged as potentially useful materials for technological applications. Controllable self-assembly of interleaved crystalline heterostructures from designed thin-film precursors has been demonstrated in selenide and telluride chemical systems, but not yet in sulfide chemistries. Preparing suc...
Article
Iron pyrite (FeS2) has long represented a materials science challenge because of the immense sensitivity of its macroscopic behavior to defect structure. Research along this vein has primarily focused on the deleterious effects of sulfur vacancies on optical and electronic properties that prevent the material from being successfully integrated into...
Article
Combinatorial experiments involve synthesis of sample libraries with lateral composition gradients requiring spatially-resolved characterization of structure and properties. Due to maturation of combinatorial methods and their successful application in many fields, the modern combinatorial laboratory produces diverse and complex data sets requiring...
Preprint
Full-text available
Combinatorial experiments involve synthesis of sample libraries with lateral composition gradients requiring spatially-resolved characterization of structure and properties. Due to maturation of combinatorial methods and their successful application in many fields, the modern combinatorial laboratory produces diverse and complex data sets requiring...
Article
High throughput synthesis and characterization methods can significantly accelerate the rate of experimental research. For physical vapor deposition (PVD), high throughput synthesis methods include combinatorial sputtering with intentional gradients of metal/metalloid composition, temperature, and thickness across the substrate. However, many other...
Article
Full-text available
Solids composed of iron and sulfur are earth abundant and nontoxic, and can exhibit interesting and technologically important optical, electronic, and magnetic phenomena. However, the iron-sulfur (Fe-S) phase diagram is congested in regions of slight non-stoichiometric iron vacancies, and even when the iron atomic composition changes by even a few...
Article
Polyimide-based azobenzene polymer networks have demonstrated superior photomechanical performance over more conventional azobenzene-doped pendent and cross-linked polyacrylate networks. These materials exhibit larger yield stress and glass transition temperatures and thus provide robustness for active control of adaptive structures directly with p...

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Also, does the expected R-factor or wRp have any quantitative relationship to uncertainty?

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