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Albuquerque, NM, United States

Kambour K.E.,Leidos | Kouhestani C.,TEAM Technologies Inc. | Nguyen D.D.,COSMIAC | Devine R.A.B.,Think Strategically
Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics | Year: 2016

The need for more reliable and radiation hard complementary metal-oxide-semiconductor compatible devices coupled with an ever increasing shrinkage of device dimensions has led naturally to interest in metal-oxide semiconductor field-effect transistors having nontraditional geometries. One such geometry is the gate-all-around transistor, which has been suggested to be less sensitive than its planar counterpart to the effect of charge build-up at the semiconductor-insulator interface such as that induced by irradiation. In order to explore the radiation hardness of such a structure, the effect of radiation on gate-all-around n-type metal-oxide-semiconductor devices was investigated by computing the effect of charging on the threshold voltage of the device. The radiation sensitivity in ideal structures is explored, and the greater radiation sensitivity found experimentally in some devices is explained. © 2016 American Vacuum Society.


Kouhestani C.,TEAM Technologies Inc. | Nguyen D.D.,COSMIAC | Kambour K.E.,Leidos | Devine R.A.B.,Think Strategically | And 3 more authors.
Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics | Year: 2015

The authors have examined ionizing radiation effects in the organic photovoltaic material poly(3-hexylthiophene):([6, 6]-phenyl C61 butyric acid methyl ester) for total accumulated doses up to 300 krad(SiO2). The authors find that the open circuit voltage varies with the accumulation of irradiation; however, the other parameters such as relaxation time, short circuit current, and charge carrier density remain to first order constant. This behavior is inconsistent with observations on preirradiation devices in which all depend directly on the open circuit voltage. © 2015 American Vacuum Society.


Kouhestani C.,TEAM Technologies Inc. | Nguyen D.D.,COSMIAC | Kambour K.E.,Leidos | Devine R.A.B.,Think Strategically | And 3 more authors.
Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics | Year: 2015

The authors have used transient photovoltage measurements to evaluate carrier relaxation times (τ) in P3HT:PCBM based photocells over a wide range of open circuit voltages. Satisfactory agreement is found with data obtained by low frequency impedance measurements. The authors find the differential capacitance measurements yield data consistent with the theoretical value expected based on Langevin recombination. The Langevin coefficient is three orders of magnitude smaller than the theoretical one. For the low light levels, the relaxation time variation is determined by the RC time constant behavior of the photodiode. © 2015 American Vacuum Society.


Schroder K.,University of Bonn | Klein R.,University of Bonn | Zinke A.,TEAM Technologies Inc.
Computer Graphics Forum | Year: 2013

Visual prototyping of materials is relevant for many computer graphics applications. A large amount of modelling flexibility can be obtained by directly rendering micro-geometry. While this is possible in principle, it is usually computationally expensive. Recently, bidirectional texture functions (BTFs) have become popular for efficient photorealistic rendering of surfaces. We propose an efficient system for the computation of synthetic BTFs using Monte Carlo path tracing of micro-geometry. We observe that BTFs usually consist of many similar apparent bidirectional reflectance distribution functions. By exploiting structural similarity we can reduce rendering times by one order of magnitude. This is done in a process we call non-local image reconstruction, which has been inspired by non-local means filtering. Our results indicate that synthesizing BTFs is highly practical and may currently only take a few minutes for BTFs with 70 × 70 viewing and lighting directions and 128 × 128 pixels. Non-Local Image Reconstruction for Efficient Computation of Synthetic Bidirectional Texture Functions Kai Schröder, Reinhard Klein, Arno Zinke We propose an efficient system for the synthesis of BTFs using Monte Carlo path tracing of micro-geometry. By exploiting structural similarity we can reduce rendering times by one order of magnitude. This is done in a process we call non-local image reconstruction, which has been inspired by non-local means filtering. © 2013 The Authors Computer Graphics Forum © 2013 The Eurographics Association and John Wiley & Sons Ltd.


Grant
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 79.97K | Year: 2014

A reduced hazard antenna design will be developed for deployment on handheld and manpack radios. High voltage protection will be built into the antenna to prevent accidental electrical contact with high voltage power lines up to 25kVDC RMS. Prototypes of the high voltage protection devices will be developed and tested. The antenna design will be modeled before constructing a bench prototype, which will be tested for RF and HV protection performance.

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