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Article
Durability of rewritable phase-change Ge X Sb Y Te1 − X − Y memory devices
The bond constraint theory (BCT) dealing with the rigidity caused by bond constraints and the long-range potential fluctuations (LRPF) arising from the defects and heterogeneities in the disordered semiconduct...
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Article
Role of Surface on the Persistent Photoconductivity in Porous Silicon and Boron Doped a-Si:H
The effect of ambient conditions on light soaking (LS) in porous silicon (PS) is studied. In vacuum, LS on porous silicon increases dark current (DC) while in presence of water vapor it decreases DC. Interesti...
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Article
Light and Thermally Induced Metastabilities in Nanocrystalline Silicon
Light soaking for short durations and thermal quenching produce metastable states having a higher dark current, higher photo current, a larger photoluminescence and a smaller electron spin resonance signal in ...
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Article
Circulating endothelial progenitor cells, endothelial function, carotid intima–media thickness and circulating markers of endothelial dysfunction in people with type 1 diabetes without macrovascular disease or microalbuminuria
Type 1 diabetes is associated with premature arterial disease. Bone-marrow derived, circulating endothelial progenitor cells (EPCs) are believed to contribute to endothelial repair. The hypothesis tested was t...
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Article
Bond constraint theory and the quest for the glass computer
Electronic switching in amorphous chalcogenide semiconductors has been observed and studied for nearly forty years. Technological exploitation of this phenomenon has most recently emerged in DVD’s where GST, a...
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Article
Why phase-change Materials work: An EXAFS Investigation of Ge-Sb-Te Alloys
Studies of amorphous (a-) semiconductors have been driven by technological advances as well as fundamental theories. Observation of electrical switching, for example, fueled early interest in a-chalcogenides. ...
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Article
Comparison of the Effect of Light Soaking in Porous Silicon and a-Si:H
In undoped a-Si:H thin films, light soaking (LS) decreases dark current and photocurrent and increases the electron spin resonance signal monotonically with increasing exposure time, (Staebler-Wronski Effect, ...
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Article
Production of L-Phenylacetyl Carbinol by Immobilized Cells of Saccharomyces Cerevisiae
Conversion of benzaldehyde to l-phenylacetyl carbinol (l-PAC) was achieved with immobilized, growing cells of Saccharomyces cerevisiae in different reactors. Product formation increased (31%) with the subsequent ...
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Article
Potential fluctuations and metastabilities in hydrogenated amorphous silicon
The inhomogeneities present in hydrogenated amorphous silicon (a-Si : H) give rise to potential fluctuations. They influence the electronic properties of a-Si : H in a profound manner. Nevertheless, very few t...
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Article
Surface effects in nanocrystalline silicon
Exposure to ammonia (NH3) increases the dark current (DC) in nanocrystalline silicon. Light soaking (LS) for short periods also enhances the dark current, which remains at a high value for a long time. Pum** al...
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Article
Effect of Surface Treatments in Nanocrystalline Silicon
Exposure to ammonia (NH3) increases the dark current (DC) in porous silicon (PS), but evaporated selenium (Se) deposited on PS decreases DC. Photoluminescence (PL) measurement shows that there are two types of ce...
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Article
Metastable defects in hydrogenated amorphous silicon
The electronic structure of hydrogenated amorphous silicon (a-Si:H) is in a state of metastable equilibrium and can change upon application of external stimuli. We study the effect of thermal quenching and lig...
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Article
Deposition of diamond films on metal substrates
In this paper we report on the growth of polycrystalline diamond films on Mo, W, and Ni substrates using oxy-acetylene combustion flame technique. Effect of substrate temperature on the growth of diamond films...
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Article
Amorphous silicon as hydrogen glass
The hydrogen in hydrogenated amorphous silicon (a-Si: H) makes it behave like a hydrogen glass. Above a temperatureT E, which is analogous to the glass transition temperature, the hydrogen is able...
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Article
Electronic structure of amorphous semiconductors
The effect of light soaking and thermal quenching on the electronic structure of hydrogenated amorphous silicon (a-Si:H) and chalcogenide glasses was studied. It was found that lithium dopeda-Si:H shows both ligh...
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Article
Amorphous silicon-based superlattices
Synthesis and some interesting properties of amorphous silicon-based superlattices are reported. Both quantum-well type and do** modulated structures are studied. Quantum confinement, phonon folding and pers...
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Chapter
Persistent Photoconductivity in Amorphous Silicon Alloys
Fritzsche and his co-workers recently reported 1,2 the first synthesis and experimental results of do** modulated hydrogenated amorphous silicon (a-Si:H). These consist of alternate layers of n and p-type a-Si:...
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Article
Origin of Persistent Photoconductivity in Modulation Doped Amorphous Silicon Multilayers
We show that persistent photoconductivity (PPC) observed in npn … multilayers of hydrogenated amorphous silicon (a-Si:H) and compensated thin a-Si:H films have a common origin. It is caused by special centers ...
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Article
Erosion-corrosion of materials in high-temperature environments: Im**ement angle effects in alloys 310 and 6b under simulated coal gasification atmosphere
The present paper provides a brief overview of the existing knowledge of erosion, hightemperature erosion, and hightemperature CGA erosioncorrosion (EC) phenomena. Experimental results and interpretive analysi...
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Article
Magnetoresistance measurements in the bulk amorphous GexSe1−x system
Magnetoresistance (MR) measurements were made on bulk amorphous Ge x Se1−x samples in the temperature range 80 to 300 K and magnetic field up to 8 kG (0.8 T). It is found that M...
