Organic Contamination of Silicon Wafer in Clean Room Air and its Impact to Gate Oxide Integrity

1997 ◽  
Vol 477 ◽  
Author(s):  
D. Imafuku ◽  
W. Mizubayashi ◽  
S. Miyazaki ◽  
M. Hirose ◽  
Y. Wakayama ◽  
...  
Keyword(s):  
Silicon Wafer ◽  
Degradation Mechanism ◽  
Gate Oxide ◽  
Contamination Level ◽  
Degradation Behavior ◽  
Clean Room ◽  
Organic Contamination ◽  
Organic Adsorbates ◽  
Wafer Surfaces ◽  
Dielectric Degradation

ABSTRACTOrganic adsorbates on silicon wafer surfaces exposed to superclean room air were measured to evaluate organic contamination level of silicon wafers stored in a clean bench up to 180min. Such Si wafers were thermally oxidized and the dielectric degradation behavior were systematically investigated. It is found that a carbon contamination level of half a monolayer influences the charge to quasi-breakdown although the degradation mechanism itself remains unchanged.

Organic Contamination of Silicon Wafer in Clean Room Air and Its Impact to Gate Oxide Integrity

1997 ◽  
Vol 473 ◽  
Author(s):  
D. Imafuku ◽  
W. Mizubayashi ◽  
S. Miyazaki ◽  
M. Hirose ◽  
Y. Wakayama ◽  
...  
Keyword(s):  
Silicon Wafer ◽  
Degradation Mechanism ◽  
Gate Oxide ◽  
Contamination Level ◽  
Degradation Behavior ◽  
Clean Room ◽  
Organic Contamination ◽  
Organic Adsorbates ◽  
Wafer Surfaces ◽  
Dielectric Degradation

ABSTRACTOrganic adsorbates on silicon wafer surfaces exposed to superclean room air were measured to evaluate organic contamination level of silicon wafers stored in a clean bench up to 180min. Such Si wafers were thermally oxidized and the dielectric degradation behavior were systematically investigated. It is found that a carbon contamination level of half a monolayer influences the charge to quasi-breakdown although the degradation mechanism itself remains unchanged.

Experimental Observation of Fractal-Regular Surfaces and a Transformation Scheme for Extracting Fractal Parameters

2005 ◽  
Author(s):  
Shao Wang ◽  
Wai Kin Chan
Keyword(s):  
Silicon Wafer ◽  
Roughness Parameter ◽  
Hard Disk ◽  
Spectral Density Function ◽  
Power Spectral ◽  
Fractal Parameters ◽  
Asperity Contacts ◽  
Fractal Roughness ◽  
Magnetic Hard Disk ◽  
Wafer Surfaces

To account for the effects of asperity contacts at various length scales, it is appropriate to characterize an engineering surface as a fractal-regular surface. In spite of significant theoretical advancement, there is a desperate need for experimental verification of the theory of fractal-regular surfaces and a consistent scheme of obtaining the fractal parameters. In the present study, the existence of a fractal region and a regular-shape region in the power spectral density function for fractal-regular surfaces was confirmed experimentally, for the first time, with data obtained from magnetic hard disk and silicon wafer surfaces. A novel scheme involving a variable transformation was developed to extract fractal parameters. This scheme was validated by accurate recovery of fractal parameters from simulated surfaces. The fractal dimension, the fractal roughness parameter and the fractal domain length were found for magnetic hard disk and silicon wafer surfaces.

scholarly journals Degradation Behavior of Polymers Used as Coating Materials for Drug Delivery—A Basic Review

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1272
Author(s):  
Anita Ioana Visan ◽  
Gianina Popescu-Pelin ◽  
Gabriel Socol
Keyword(s):  
Drug Delivery ◽  
Degradation Mechanism ◽  
Degradation Behavior ◽  
Polymeric Coatings ◽  
Degradation Mechanisms ◽  
Coating Materials ◽  
Factors Affecting ◽  
Existing Problems ◽  
Future Performance ◽  
Measuring Techniques

The purpose of the work was to emphasize the main differences and similarities in the degradation mechanisms in the case of polymeric coatings compared with the bulk ones. Combined with the current background, this work reviews the properties of commonly utilized degradable polymers in drug delivery, the factors affecting degradation mechanism, testing methods while offering a retrospective on the evolution of the controlled release of biodegradable polymeric coatings. A literature survey on stability and degradation of different polymeric coatings, which were thoroughly evaluated by different techniques, e.g., polymer mass loss measurements, surface, structural and chemical analysis, was completed. Moreover, we analyzed some shortcomings of the degradation behavior of biopolymers in form of coatings and briefly proposed some solving directions to the main existing problems (e.g., improving measuring techniques resolution, elucidation of complete mathematical analysis of the different degradation mechanisms). Deep studies are still necessary on the dynamic changes which occur to biodegradable polymeric coatings which can help to envisage the future performance of synthesized films designed to be used as medical devices with application in drug delivery.

High Sensitivity Optical Detection of Oriented Microdefects on Silicon Wafer Surfaces Using Annular Illumination

CIRP Annals ◽  
2001 ◽  
Vol 50 (1) ◽  
pp. 389-392 ◽  
Author(s):  
Takashi Miyoshi ◽  
Satoru Takahashi ◽  
Yasuhiro Takaya ◽  
Shoichi Shimada
Keyword(s):  
Silicon Wafer ◽  
Optical Detection ◽  
High Sensitivity ◽  
Wafer Surfaces

A Boost-Up Method of MEMS-Bulk-Micromachining towards C-MEMS Fabrication for Sensing and Manipulating Bioparticles

2011 ◽  
Vol 316-317 ◽  
pp. 59-67
Author(s):  
M. Rizwan Malik ◽  
Tie Lin Shi ◽  
Zi Rong Tang ◽  
M. Haseeb
Keyword(s):  
Silicon Wafer ◽  
Three Dimensional ◽  
Wafer Surface ◽  
Main Concern ◽  
Mems Fabrication ◽  
Technological Field ◽  
Broad Concept ◽  
Silicon Cantilever ◽  
Wafer Surfaces ◽  
Comprehensive Study

Much of the recent ongoing advanced research into the quest for improved etching techniques has brought forth a broad concept for the fabrication of micro/nano-electromechanical systems (MEMS/NEMS) having high accuracy, precision, efficiency, compatibility and through-put of metallic- as well as carbon-composition structural phases. This in turn leads towards a thorough understanding of the sensing, trapping, separating, controlling, positioning, directing, concentrating and manipulating of micro-nano-sized particles - predominantly biological particles - in the emerging MEMS/NEMS technological field. This paper focuses its attention on the easiest means of wet-etching {100}-type silicon wafer surfaces by guiding the choice of [<100> or <010>] orientation (at 45° to the normal orientation). This anisotropic etching is performed in KOH solution. Here, consideration is not concerned to a large extent with process parameters as in anodic oxidation, an intensely doped boron etching stops and silicon wafer surface back-etching. The main concern of the present practical application route involves a passivating material (silicon dioxide, SiO2) and two masking stages (for a two-step etching process). As a example of this method, silicon cantilever beams having vertical edges are produced. It is concluded that the method presented will be helpful in the comprehensive study of resonators, pressure/temperature sensors, three-dimensional carbon micro-electrodes, actuators and accelerometers for bioparticle applications.

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