20 Result(s)

Article

Theory of Electronic, Optical and Transport Properties in Silicon Quantum Wires

G. D. Sanders, C. J. Stanton, Y. C. Chang in MRS Online Proceedings Library (1992)

Article

Composition and stability of Ω phase in an Al-Cu-Mg-Ag Alloy

Transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS) were employed to determine the stability and composition of the Ω phase in an Al-Cu-Mg-Ag alloy. It is shown that the Ω. ph...

Y. C. Chang, J. M. Howe in Metallurgical Transactions A (1993)

Article

Analysis of Interface Dynamics in Solid-State Phase Transformations by In Situ Hot-Stage High-Resolution Transmission Electron Microscopy

In situ hot-stage high-resolution transmission electron microscopy (HRTEM) provides unique capabilities for quantifying the dynamics of interfaces at the atomic level. Such information is critical for understandi...

James M. Howe, W. E. Benson, A. Garg, Y.-C. Chang in MRS Online Proceedings Library (1994)

Article

Dam** characteristics of Ti₅₀Ni_49.5Fe_0.5 and Ti₅₀Ni₄₀Cu₁₀ ternary shape memory alloys

The dam** characteristics of Ti₅₀Ni_49.5Fe_0.5 and Ti₅₀Ni₄₀Cu₁₀ ternary shape memory alloys (SMAs) have been systematically studied by resonant-bar testing and internal friction (IF) measurement. The dam** capa...

U. C. Lin, S. K. Wu, Y. C. Chang in Metallurgical and Materials Transactions A (1995)

Article

Growth and Characterization of Interfaces in P-Type InGaAs/InP Quantum-Well Infrared Photodetectors with Ultra-Thin Quantum Wells

P-type InGaAs/InP quantum-well infrared photodetectors operated at 4.55 μm require the growth of ultra-thin (10 Å) quantum wells. We report a study of interfaces in QWIPs grown by gas-source molecular beam epi...

D. K. Sengupta, S. Kim, T. Horton, H. C. Kuo, S. Thomas… in MRS Online Proceedings Library (1996)

Article

Electrochemical behaviors of li electrode in organic electrolytes

Characterizations of the morphology of lithium deposited in organic electrolytes were carried out using Ni substrates pretreated with H₂ and CO₂ gases prior to electrodeposition. The electrolytes used were 1 M Li...

S. I. Jo, K. J. Kwon, Y. C. Chang, H. J. Sohn, T. Kang in Metals and Materials (1997)

Article

Lead Iodide X-Ray and Gamma-Ray Spectrometers for Room and High Temperature Operation

In this study we report on the results of the investigation of lead iodide material properties. The effectiveness of a zone refining purification method on the material purity is determined by ICP-MS and ICP-O...

H. Hermon, R. B. James, J. Lund, E. Cross, A. Antolak… in MRS Online Proceedings Library (1997)

Article

Growth and characterization of n-type InP/InGaAs quantum well infrared photodetectors for response at 8.93 µm

We present experimental results on the growth and characterization of n-type InGaAs/InP quantum-well intersubband photodetectors for use at 8.93 µm. High-quality InGaAs/InP multiple quantum wells were grown by...

D. K. Sengupta, S. L Jackson, A. P. Curtis, W. Fang… in Journal of Electronic Materials (1997)

Article

Photoluminescence Excitation Study of Lo-Phonon Assisted Excitonic Transitions in GaN

We report the results of a photoluminescence excitation (PLE) study on excitonic transitions in GaN. PLE measurements were carried out as a function of temperature to investigate exciton formation, thermalizat...

S.J. Hwang, Y.H. Cho, J.J. Song, W. Shan, Y.C. Chang in MRS Online Proceedings Library (1997)

Article

Monolithically Integrated Dual-Band Quantum Well Infrared Photodetector

A monolithic quantum well infrared photodetector (QWIP) structure has been presented that is suitable for dual bands in the two atmospheric transmission windows of 3 - 5.3 fum and 7.5 - 14fum, respectively. Th...

D. K. Sengupta, S. D. Gunapala, S. V. Bandara, F. Pool… in MRS Online Proceedings Library (1997)

Article

Growth and characterization of InGaAs/InP p-quantum-well infrared photodetectors with extremely thin quantum wells

High-quality InGaAs/InP quantum wells with ultra-narrow well widths (∼10Å) and peak response at 4.55 µm were grown by gas source molecular beam epitaxy. These structures were characterized by cross-sectional t...

D. K. Sengupta, S. L. Jackson, A. P. Curtis, W. Fang… in Journal of Electronic Materials (1997)

Article

Growth and characterization of n-type GaAs/AlGaAs quantum well infrared photodetector on GaAs-on-Si substrate

We present in this article device characteristics of molecular beam epitaxy grown GaAs/AlGaAs quantum well infrared photodetectors (QWIP) on a semi-insulating GaAs substrate and on a GaAs-on-Si substrate grown...

D. K. Sengupta, M. B. Weisman, M. Feng, S. L. Chuang… in Journal of Electronic Materials (1998)

Article

Bandgap Shifting of an Ultra-Thin InGaAs/InP Quantum Well Infrared Photodetector via Rapid Thermal Annealing

We demonstrate that SiO₂ cap rapid thermal annealing in ultra-thin p-type InGaAs/InP quantum wells can be used to produce large blue shifts of the band edge. A substantial bandgap blue shift, as much as 292.5 meV...

D. K. Sengupta, S. Kim, H. C. Kuo, A. P. Curtis… in MRS Online Proceedings Library (1998)

Article

The Hot Corrosion of Fe-Mn-Al–C Alloy with NaCl/Na₂SO₄ Coating Mixtures at 750°C

The high-temperature corrosion behavior of Fe-30.1Mn-9.7Al-0.77C alloy initially coated with 2 mg/cm² NaCl/Na₂SO₄ (100/0, 75/25, 50/50, 25/75 and 0/100 wt.%) deposits has been studied at 750°C in air. The result ...

C.-J. Wang, Y.-C. Chang, Y.-H. Su in Oxidation of Metals (2003)

Article

TEM Study on the Internal Oxidation and Nitriding of Dual Phase Fe–Mn–Al–C Alloy AfterNaCl-Induced Corrosion

A dual-phase Fe–Mn–Al–C alloy was oxidized at 750°C in air with 2 initial mg/cm² NaCl deposits. After 9 hr of exposure a fine-void zone was observed in the middle subscale and a coarse-void layer in the inner sub...

C.-J. Wang, Y.-C. Chang in Oxidation of Metals (2003)

Article

Thermal Conductivity of GaN Grown on Silicon Substrates

One of the principle problems of high power electronic devices is the extraction of heat from the active region of the device¹. The thermal conductivity of the substrate is a crucial parameter affecting the therm...

C. Mion, Y. C. Chang, J. F. Muth, P. Rajagopal… in MRS Online Proceedings Library (2003)

Article

Spin Lifetime Tuning in Zincblende Heterostructures and Tions to Spin Devices

We present analytical expressions for the D’yakonov-Perel’ spin relaxation rates under the combined action of bulk and structural inversion asymmetry for [111] zincblende heterostructures when terms up to line...

X. Cartoixà, D. Z.-Y. Ting, Y.-C. Chang in MRS Online Proceedings Library (2004)

Article

Optical Characterization of High Quality GaN Produced by High Rate Magnetron Sputter Epitaxy

The thick films of GaN were investigated using X-ray diffraction, micro-Raman spectroscopy and photoluminescence spectroscopy. The thick films of GaN were prepared on (0001) sapphire using high rate magnetron ...

Minseo Park, E. Carlson, Y. C. Chang, J. F. Muth… in MRS Online Proceedings Library (2011)

Article

Mechanical and Tribological Properties and High-Speed Drilling Performance of NbTiN Coatings Prepared by High-Power Impulse Magnetron Sputtering with Varying Nitrogen and Acetylene Flux Rates

NbTiNx and NbTiN₂₅-CHx coatings (where x indicates the nitrogen or acetylene flux rate) were deposited on SKH51 substrates by high-power impulse magnetron sputtering. The study comprised three stages. In the firs...

Y. L. Su, W. H. Kao, Y. C. Chang in Journal of Materials Engineering and Performance (2020)