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Topic Area: Semiconductor Materials

Displaying records 1 to 10 of 79 records.
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1. Design and test of reliable, high strength, ingressive polycrystalline silicon microgripper arrays
Topic: Semiconductor Materials
Published: 1/2/2015
Authors: Siddharth Hazra, J L Beuth, Grant A Myers, Frank W DelRio, Maarten de Boer
Abstract: We present the design and extensive validation of a micromachined gripper array that enables reliable transmission of forces up to 10 milliNewtons. The gripper is constructed with polycrystalline silicon, a brittle material. Two ingressive snap-a ...

2. Enriching 28Si beyond 99.9998 % for semiconductor quantum computing
Topic: Semiconductor Materials
Published: 8/5/2014
Authors: Kevin Joseph Dwyer, Joshua M Pomeroy, David S Simons, June Waiyin Lau, Kristen L Steffens
Abstract: Using a laboratory-scale apparatus, we enrich 28Si to 40 times better than previously reported starting from natural abundance silane gas and offer another source for providing these critical materials from the industrial gas centrifuge methods. ...

3. Raman spectroscopy-enhanced IIT: In situ analysis of mechanically stressed polycrystalline Si thin films
Topic: Semiconductor Materials
Published: 7/8/2014
Authors: Yvonne Beatrice Gerbig, Chris A Michaels, Robert Francis Cook
Abstract: Exposed to mechanical stress, semiconductor materials may phase transform, resulting in changes of crystallographic structure and material properties, rather than deform by plastic flow. As a consequence, prediction of the state and distribution of s ...

4. Interface Engineering to Control Magnetic Field Effects of Organic-Based Devices by Using a Molecular Self-Assembled Monolayer
Topic: Semiconductor Materials
Published: 6/26/2014
Authors: Hyuk-Jae Jang, Sujitra Jeanie Pookpanratana, Alyssa N. Brigeman, Regis J Kline, James Ian Basham, David J Gundlach, Christina Ann Hacker, Oleg A Kirillov, Oana Jurchescu, Curt A Richter
Abstract: Organic semiconductors hold immense promise for the development of a wide range of innovative devices with their excellent electronic and manufacturing characteristics. Of particular interest are non-magnetic organic semiconductors that show unusual ...

5. Estimates of photoluminescence efficiencies in GaN nanowires at high injection levels from steady- state photoluminescence measurements
Topic: Semiconductor Materials
Published: 3/10/2014
Authors: John B Schlager, Matthew David Brubaker, Kristine A Bertness, Norman A Sanford
Abstract: Photoluminescence (PL) efficiencies were estimated for individual silicon-doped GaN nanowires grown by plasma assisted molecular beam epitaxy (PAMBE). Steady-state PL measurements reveal efficiencies that depend on excitation intensity, temperatu ...

6. Measuring order in regioregular poly(3-hexylthiophene) with solid-state 13C CPMAS NMR
Topic: Semiconductor Materials
Published: 1/10/2014
Authors: Ryan C Nieuwendaal, Chad R Snyder, Dean M DeLongchamp
Abstract: We report on details of molecular packing in high molar mass poly(3-hexylthiophene) (P3HT) by solid-state 13C {1H} cross-polarization magic angle spinning (CPMAS) NMR measurements. The degree of polymer order was estimated for two films of varied dry ...

7. Epitaxial Si encapsulation of highly misfitting SiC quantum dot arrays formed on Si (001)
Topic: Semiconductor Materials
Published: 1/8/2014
Authors: Christopher W. Petz, Dongyue Yang, Alline F Myers, Jeremey Levy, Jerrold Floro
Abstract: This work examines Si overgrowth to encapsulate 3C-SiC quantum dot arrays epitaxially grown on Si substrates. Using transmission electron microscopy we show how the crystalline quality of the Si cap depends on the growth conditions. Overgrowth at 3 ...

8. Degradation of photovoltaic devices at high concentration by space charge limited currents
Topic: Semiconductor Materials
Published: 10/1/2013
Authors: Ari D Feldman, Richard K. Ahrenkiel, John H Lehman
Abstract: High-injection mobility reduction is examined by theory, modeling, and experimental data acquired by resonance coupled photoconductive decay (RCPCD). The ambipolar mobility is shown to reduce to zero when the constituent injection-dependent carr ...

9. Decoupling small-scale roughness and long-range features on deep reactive ion etched silicon surfaces
Topic: Semiconductor Materials
Published: 9/19/2013
Authors: Frank W DelRio, Lawrence H Friedman, Michael S. Gaither, William A Osborn, Robert Francis Cook
Abstract: Roughness scaling of three different deep reactive ion etched (DRIE) silicon surfaces is investigated using atomic force microscopy. At small distances, height-height correlations H reveal power-law behavior with equal scaling exponents for all surf ...

10. Effect of Organic SAMs on the Evolution of Strength of Silicon Nanostructures
Topic: Semiconductor Materials
Published: 6/3/2013
Authors: Scott Grutzik, Brian G Bush, Frank W DelRio, Richard Swift Gates, Melissa Hines, Alan Zehnder
Abstract: The ability to accurately predict the strength of nanoscale, single crystal structures is critical in micro- and nano-electromechanical systems (MEMS and NEMS) design. Because of the small length scales involved failure does not always follow the sam ...

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