Browsing by Author "Aziz, Michael"
Now showing items 1-20 of 210
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The Activation Strain Tensor: Nonhydrostatic Stress Effects on Crystal-Growth Kinetics
Aziz, Michael; Sabin, Paul C.; Lu, Guo-Quan (American Physical Society, 1991)The solid-phase epitaxial-growth rate of crystalline Si from the amorphous Si on the tensile side is greater than on the compressive side of elastically bent wafers, in marked contrast to the behavior observed under ... -
Activation Volume for Arsenic Diffusion in Germanium
Mitha, Salman; Aziz, Michael; Schiferl, David; Poker, David B. (American Institute of Physics, 1996)We have measured the effect of pressure on As diffusion in Ge. Diffusion anneals on ion-implanted samples were carried out in a high-temperature diamond anvil cell using fluid argon as a clean, hydrostatic pressure medium. ... -
Activation Volume for Phosphorus Diffusion in Silicon and Si0.93Ge0.07
Zhao, Yuechao; Aziz, Michael; Zangenberg, Nikolaj R.; Larsen, Arne Nylandsted (American Institute of Physics, 2005)The hydrostatic pressure dependence of the diffusivity of P in compressively strained Si<sub>0.93</sub>Ge<sub>0.07</sub> and unalloyed Si has been measured. In both cases the diffusivity is almost independent of pressure, ... -
Alkaline Benzoquinone Aqueous Flow Battery for Large-Scale Storage of Electrical Energy
Yang, Zhengjin; Tong, Liuchuan; Tabor, Daniel; Beh, Eugene; Goulet, Marc-Antoni; De Porcellinis, Diana; Aspuru-Guzik, Alán; Gordon, Roy; Aziz, MichaelAn aqueous flow battery based on low-cost, nonflammable, noncorrosive, and earth-abundant elements is introduced. During charging, electrons are stored in a concentrated water solution of 2,5-dihydroxy-1,4-benzoquinone, ... -
Alkaline quinone flow battery
Lin, Kaixiang; Chen, Qing; Gerhardt, Michael; Tong, Liuchuan; Kim, Sang Bok; Eisenach, Louise Ann; Valle, Alvaro West; Hardee, D.; Gordon, Roy Gerald; Aziz, Michael J.; Marshak, M (American Association for the Advancement of Science (AAAS), 2015)Storage of photovoltaic and wind electricity in batteries could solve the mismatch problem between the intermittent supply of these renewable resources and variable demand. Flow batteries permit more economical long-duration ... -
Alkaline Quinone Flow Battery with Long Lifetime at pH 12
Kwabe, David G.; Ji, Yunlong; Lin, Kaixiang; Kerr, Emily F.; Goulet, Marc-Antoni; De Porcellinis, Diana; Tabor, Daniel P.; Pollack, Daniel A.; Aspuru-Guzik, Alán; Gordon, Roy; Aziz, Michael (Elsevier BV, 2018-09)We demonstrate a long-lifetime, aqueous redox-flow battery that can operate at a pH as low as 12 while maintaining an open-circuit voltage of over 1 V. We functionalized 2,6-dihydroxyanthraquinone (2,6-DHAQ) with highly ... -
The Amorphous-Crystal Interface in Silicon: a Tight-Binding Simulation
Bernstein, Noam; Aziz, Michael; Kaxiras, Efthimios (The American Physical Society, 1998)The structural features of the interface between the cystalline and amorphous phases of Si solid are studied in simulations based on a combination of empirical interatomic potentials and a nonorthogonal tight-binding model. ... -
Anomalous Diffusion of Fe in Liquid Al Measured by the Pulsed Laser Technique
Isono, N.; Smith, Patrick M.; Turnbull, David; Aziz, Michael (Springer, 1996)The diffusivity of Fe and Cu in liquid Al was measured by using a nanosecond-duration pulsed laser to melt thin Al films ion implanted with solute. The thin film geometry eliminates convection in the melt during the ... -
Aperiodic Stepwise Growth Model for the Velocity and Orientation Dependence of Solute Trapping
Aziz, Michael; Goldman, L.M. (Materials Research Society, 1987)An atomistic model for the dependence on interface orientation and velocity v of the solute partition coefficient <i>k</i> during rapid solidification is developed in detail. Starting with a simple stepwise growth model, ... -
Application of Onsager's Reciprocity Relations to Interface Motion During Phase Transformations.
Kaplan, Theodore; Aziz, Michael; Gray, Leonard J. (Journal of Chemical Physics, 1989)A number of theories have been developed for the kinetics of steady-state interface motion during a phase transformation. One requirement of such theories is that they satisfy Onsager’s reciprocity relations for coupled ... -
Asymmetric Melting and Freezing Kinetics in Silicon.
Tsao, Jeff Y.; Aziz, Michael; Thompson, Michael O.; Peercy, Paul S. (American Physical Society, 1986)We report measurements of the melting velocity of amorphous Si relative to that of (100) crystalline Si. These measurements permit the first severe experimental test of theories describing highly nonequilibrium freezing ... -
Atomistic Features of the Amorphous-Crystal Interface in Silicon
Kaxiras, Efthimios; Bernstien, Noam; Aziz, Michael (Springer Verlag, 1998)We simulate the amorphous-crystal interface in silicon using a combination of interatomic potential molecular-dynamics and tight-binding conjugate-gradient relaxation. The samples we create have high quality crystalline ... -
Atomistic Mechanisms for the Thermal Relaxation of Au-hyperdoped Si
Yang, W.; Hudspeth, Q.; Chow, P. K.; Warrender, J. M.; Ferdous, N.; Ertekin, E.; Malladi, G.; Akey, A. J.; Aziz, Michael; Williams, J. S.; Williams, J (American Physical Society (APS), 2019-08-08) -
An Atomistic Model of Solute Trapping
Aziz, Michael J. (National Bureau of Standards, 1982) -
Au-rich filamentary behavior and associated subband gap optical absorption in hyperdoped Si
Yang, W.; Akey, Austin; Smillie, L. A.; Mailoa, J. P.; Johnson, B. C.; McCallum, J. C.; Macdonald, D.; Buonassisi, T.; Aziz, Michael J.; Williams, J. S. (American Physical Society (APS), 2017)Au-hyperdoped Si, synthesized by ion implantation and pulsed laser melting, is known to exhibit a strong sub-band gap photoresponse that scales monotonically with the Au concentration. However, there is thought to be a ... -
Benzoquinone-Hydroquinone Couple for Flow Battery
Nawar, Saraf; Huskinson, Brian; Aziz, Michael J. (Cambridge University Press (CUP), 2013)At present, there is an ongoing search for approaches toward the storage of energy from intermittent renewable sources like wind and solar. Flow batteries have gained attention due to their potential viability for inexpensive ... -
Breakeven Analysis of Energy Storage Systems in PJM Energy Markets
Salles, Mauricio; Gadotti, Taina; Aziz, Michael; Hogen, WilliamEnergy arbitrage is attracting interest of Energy Storage Systems developers and owners to provide net revenue in transmission and distribution systems. We have analyzed the potential revenue of a generic Energy Storage ... -
Breakeven Analysis of Energy Storage Systems in PJM Energy Markets
Salles, Mauricio; Gadotti, Taina; Aziz, Michael; Hogen, William -
Bromine-free quinone flow battery chemistries
Marshak, Michael; Aziz, Michael J.; Gordon, Roy Gerald; Aspuru-Guzik, Alan; Hogan, William W. (American Chemical Society, 2015) -
Carrier Dynamics and Absorption Properties of Gold-Hyperdoped Germanium: Insight Into Tailoring Defect Energetics
Dissanayake, Sashini Senali; Ferdous, Naheed; Gandhi, Hemi H.; Pastor, David; Tran, Tuan T.; Williams, Jim S.; Aziz, Michael; Mazur, Eric; Ertekin, Elif; Sher, Meng-Ju (American Physical Society (APS), 2021-06-23)Hyperdoping germanium with gold is a potential method to produce room-temperature short-wavelength-infrared radiation (SWIR; 1.4–3.0 μm) photodetection. We investigate the charge carrier dynamics, light absorption, and ...