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The Interactions of Plasma with Low-k Dielectrics: Fundamental Damage and Protection Mechanisms

Description: Nanoporous low-k dielectrics are used for integrated circuit interconnects to reduce the propagation delays, and cross talk noise between metal wires as an alternative material for SiO2. These materials, typically organosilicate glass (OSG) films, are exposed to oxygen plasmas during photoresist stripping and related processes which substantially damage the film by abstracting carbon, incorporating O and OH, eventually leading to significantly increased k values. Systematic studies have been performed to understand the oxygen plasma-induced damage mechanisms on different low-k OSG films of various porosity and pore interconnectedness. Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy and atomic force microscopy are used to understand the damage kinetics of O radicals, ultraviolet photons and charged species, and possible ways to control the carbon loss from the film. FTIR results demonstrate that O radical present in the plasma is primarily responsible for carbon abstraction and this is governed by diffusion mechanism involving interconnected film nanopores. The loss of carbon from the film can be controlled by closing the pore interconnections, He plasma pretreatment is an effective way to control the damage at longer exposure by closing the connections between the pores.
Date: August 2011
Creator: Behera, Swayambhu Prasad
Partner: UNT Libraries

Final Report on Research Conducted under Grant DE-FG02-98ER14857

Description: Work in the Carpenter laboratory under the aegis of grant DE-FG02-98ER14857 concerned the formation, properties, and reactions of organic free radicals known or believed to be important in hydrocarbon combustion. Both computational and experimental methods were employed in these studies.
Date: January 28, 2008
Creator: Carpenter, Barry,K. & Davis, H., Floyd
Partner: UNT Libraries Government Documents Department

Transplants

Description: The body of work originating from this Problem in Lieu of Thesis consists of paintings on canvas that incorporate representations of plant material. The impetus for the paintings was black and white photocopies created from mounds of plant material placed on a copy machine. The resulting copies contained forms that were organic in appearance, but unrecognizable as known objects. Parts of the most interesting and ambiguous copies were used to develop the imagery of the paintings. The new forms served the purpose of creating visual interest from unexpected images. Combined with traditional painting techniques, the selected forms produced paintings of mysterious and playful worlds similar to those parts of the environment not readily accessed, such as galactic space, microscopic organisms, and ocean depths.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2004
Creator: Holden, Susan Morrow
Partner: UNT Libraries

Organic Revelations

Description: Recently my creative process has led to a new area of investigation and exploration. I have discovered that I enjoy the unexpected occurrences that happen while painting. I have an appreciation for the parts of my works that do not follow the preliminary sketch and are produced more subconsciously. While usually this aspect has been restricted by the adherence to a preliminary sketch and narrative, the new works explore these occurrences more fully. In the new works, I worked in a more spontaneous manner to create work that does not focus strictly on narrative but reveals itself more as a journey or exploration.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: May 2003
Creator: Jones, Paul David
Partner: UNT Libraries

Abstract Moments of Art Found in the Ordinary

Description: This paper is an experiment using digital video to locate and identify the abstract in everyday life and nature. The abstract moment occurs when the image that is captured by video loses its connection with the original context, allowing the images to be viewed in an entirely new way. The abstract moment is initiated by a transformative instant, that instant in which perception is altered and the viewer sees the intended content of composition of light and sound. The project contains four digital videos that record the artist's progress and interests.
Date: December 2002
Creator: Kraft, Stuart
Partner: UNT Libraries

Sequence without Uniformity

Description: The inspiration for my undergraduate body of work is derived from my fascination with Henri Matisse, Jacob Lawrence, and the Impressionists. I suddenly became captivated with the Impressionist movement and the independence of abstraction. I set into motion a series of paintings and drawings featuring random African-Americans and African society representatives in vibrant color and abstracting forms, and was specifically concerned with altering the form outside of the realistic area. While in graduate school, I began to think about how the transformation from realism to abstraction combined with the conception of mortal to the immortal. I worked through ideas to see exactly where these views began, and where they would take me as an artist. Almost immediately I experimented with random figures found specifically in the N'debele culture in South Africa. In addition, I incorporated abstraction and expressive marks within the figure and slowly introduced cut paper, flat imagery and abstraction with the realistic figure. This became very challenging but I was determined to unite these ideas successfully. More recently, my work has concentrated on the essential elements that have influenced my work as an artist, which recedes to childhood. The main elements most prevalent within the work is rhythm and space. I learned to use the musical rhythm as an instinctive reference point, as well as exploring issues of space and solid areas of flat color, thus I strived to unite all areas together to create an integrated composition.
Date: August 2002
Creator: Woodford, Nicole Yvonne
Partner: UNT Libraries

Using Perspective to Model Complex Processes

Description: The notion of perspective, when supported in an object-based knowledge representation, can facilitate better abstractions of reality for modeling and simulation. The object modeling of complex physical and chemical processes is made more difficult in part due to the poor abstractions of state and phase changes available in these models. The notion of perspective can be used to create different views to represent the different states of matter in a process. These techniques can lead to a more understandable model. Additionally, the ability to record the progress of a process from start to finish is problematic. It is desirable to have a historic record of the entire process, not just the end result of the process. A historic record should facilitate backtracking and re-start of a process at different points in time. The same representation structures and techniques can be used to create a sequence of process markers to represent a historic record. By using perspective, the sequence of markers can have multiple and varying views tailored for a particular user's context of interest.
Date: April 4, 1999
Creator: Kelsey, R.L. & Bisset, K.R.
Partner: UNT Libraries Government Documents Department

Beta Lambda

Description: The abstract painting is composed of wavy, diagonal lines in hues of green, red, blue, yellow, orange, gold, black, brown and purple painted on canvas.
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Date: 1960
Creator: Louis, Morris, 1912-1962
Partner: UNT College of Visual Arts + Design

Synchromy in Blue

Description: The abstract painting includes hues of blue, red, yellow, green, white, and black.
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Date: 1917/1918~
Creator: Macdonald-Wright, Stanton, 1890-1973
Partner: UNT College of Visual Arts + Design