Dr. Sigurd Wagner Profile

Dr. Sigurd Wagner

Professor at Princeton Univ

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Publications (12)

Proceedings Article | 27 March 2015 Paper

Pyro-paraelectricity: a new effect in hetergeneous material architectures

Sheng Mao, Bhadrinarayana Visweswaran, Prashant Purohit, Sigurd Wagner, Michael McAlpine, Kwaku Ohemeng, Huai-An Chin

Proceedings Volume 9439, 94390E (2015) https://doi.org/10.1117/12.2083644

KEYWORDS: Dielectrics, Heterojunctions, Dielectric polarization, Temperature metrology, Thin films, Platinum, Silica, Crystals, Capacitance, Electrodes

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The electrical responses of materials and devices subjected to thermal inputs, such as the Seebeck effect and pyroelectricity, are of great interest in thermal-electric energy conversion applications. Of particular interest are phenomena which exploit heterogeneities in the mechanics of heterostructured materials for novel and unexplored mechanisms in thermal-electric conversion. Here we introduce a new and universal mechanism for converting thermal stimuli into electricity via structural heterogeneities, which we term “pyro-paraelectricity.” Specifically, when a paraelectric material is grown on a substrate with a different lattice constant, the paraelectric layer experiences an inhomogeneous strain due to the lattice mismatch, establishing a strain gradient along the axis of the layer thickness. This induced strain gradient can be multiple orders of magnitude higher than strain gradients in bulk materials imparted by mechanical bending (0.1 m^-1). Consequently, charge separation is induced in the paraelectric layer via flexoelectricity, leading to a polarization in proportion to the dielectric constant. The dielectric constant, and thus the polarization, changes with temperature. Therefore, when a strained metal-insulator-metal (MIM) heterostructure is subjected to a thermal input, changes in the permittivity generate an electrical response. We demonstrate this mechanism by employing a MIM heterostructure with a high permittivity sputtered barium strontium titanate (BST) film as the insulating layer in a platinum sandwich. The resulting strain gradient of more than 10⁴ m^-1, an enhancement of five orders of magnitude due to the structural heterogeneity, was verified by an X-ray diffraction scan. With an applied thermal input, the strained MIM heterostructure generated current which was highly correlated to the thermal input. A theoretical model was found to be consistent with the experimental data. These results demonstrate the existence of “pyro-paraelectricity,” a flexoelectricity-mediated mechanism for thermal-electrical conversion.

Proceedings Article | 12 November 2007 Paper

Technical issues of stainless steel foil substrates for OLED display applications

Yongtaek Hong, Seungjun Chung, I-Chun Cheng, Sigurd Wagner, Alex Kattamis

Proceedings Volume 6655, 66550N (2007) https://doi.org/10.1117/12.737213

KEYWORDS: Organic light emitting diodes, Surface roughness, Capacitive coupling, Dielectrics, Glasses, Thin films, Capacitance, Laser cutting, Signal processing, Electrodes

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Proceedings Article | 25 May 2005 Paper

Technology for a conformally shaped phosphorescent OLED display

Jim Esler, Mike Hack, Sigurd Wagner, Yeh-Jiun Tung, Rabin Bhattacharya

Proceedings Volume 5801, (2005) https://doi.org/10.1117/12.602312

KEYWORDS: Organic light emitting diodes, Domes, Positron emission tomography, Gold, Aluminum, Electronics, Resistance, Scanning electron microscopy, Metals, Polymers

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Proceedings Article | 10 September 2003 Paper

Active-matrix OLED using 150oC a-Si TFT backplane built on flexible plastic substrate

R. Eveson, Helena Gleskova, Ke Long, John Schmidt, Marie O'Regan, W. MacDonald, Charles Chanley, James Sturm, Kalluri Sarma, Ralf Wessel, Jared Roush, Sigurd Wagner, Gordana Srdanov, Matthew Stevenson, Sonia Dodd, Jeffrey Innocenzo, Gang Yu

Proceedings Volume 5080, (2003) https://doi.org/10.1117/12.497638

KEYWORDS: Organic light emitting diodes, Amorphous silicon, LCDs, Glasses, Flexible displays, Coating, Transistors, Polymers, Manufacturing, Oxygen

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Proceedings Article | 28 July 2003 Paper

Photoconductive high-voltage switches of thin film amorphous silicon for EAP actuators

Ron Pelrine, Stéphanie Lacour, Harsha Prahlad, Sigurd Wagner

Proceedings Volume 5051, (2003) https://doi.org/10.1117/12.484712

KEYWORDS: Electroactive polymers, Switches, Actuators, Amorphous silicon, Photoresistors, Thin films, Electrodes, Glasses, Silicon, Aluminum

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Proceedings Article | 16 May 2003 Paper

Thin film transistors made of nanocrystalline silicon for CMOS on plastic

I-Chun Cheng, Sigurd Wagner

Proceedings Volume 5004, (2003) https://doi.org/10.1117/12.476822

KEYWORDS: Crystals, Plasma enhanced chemical vapor deposition, Glasses, Transistors, Thin films, Silicon, Silicon films, Reactive ion etching, Chromium, Electronics

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Proceedings Article | 28 August 2002 Paper

Enabling technologies for plastic displays

Helena Gleskova, Stephen Fonash, James Sturm, Thomas Jackson, Sigurd Wagner

Proceedings Volume 4712, (2002) https://doi.org/10.1117/12.480927

KEYWORDS: Transistors, Organic semiconductors, Silicon, Amorphous silicon, Printing, Polymers, Thin films, Optical lithography, Electrodes, Manufacturing

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Proceedings Article | 7 September 2001 Paper

Flexible display enabling technology

James Sturm, Thomas Jackson, Sigurd Wagner, Stephen Fonash

Proceedings Volume 4362, (2001) https://doi.org/10.1117/12.439119

KEYWORDS: Polymers, Transistors, Thin films, Silicon, Printing, Glasses, Organic light emitting diodes, Silicon films, Optical lithography, Flexible displays

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Proceedings Article | 12 April 1999 Paper

Compliant substrates for thin-film transistor backplanes

Sigurd Wagner, Helena Gleskova, Eugene Ma, Zhigang Suo

Proceedings Volume 3636, (1999) https://doi.org/10.1117/12.344653

KEYWORDS: Transistors, Thin films, Glasses, Electronics, Chromium, Information operations, Dielectrics, Metals, Amorphous silicon, Semiconducting wafers

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Proceedings Article | 1 July 1997 Paper

Device technology for lightweight panoramic displays

Stephen Fonash, Antoine Kahn, Osama Awadelkarim, John Crowley, Sigurd Wagner, James Sturm, Thomas Jackson

Proceedings Volume 3057, (1997) https://doi.org/10.1117/12.276983

KEYWORDS: Metals, Amorphous silicon, Organic light emitting diodes, Panoramic photography, Glasses, Light valves, Reflectivity, Opacity, Dielectrics, Crystals

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Proceedings Article | 1 July 1997 Paper

Industry/university teaming for display research

Osama Awadelkarim, Terry Peterson, John Crowley, Stephen Fonash, Sigurd Wagner, James Sturm, Thomas Jackson, Antoine Kahn

Proceedings Volume 3057, (1997) https://doi.org/10.1117/12.277004

KEYWORDS: Manufacturing, Thin films, Semiconductors, Analytical research, Laser crystals, Electronics, LCDs, Dielectrics, Defense and security, Interfaces

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Proceedings Article | 10 April 1997 Paper

Self-passivated copper gates for amorphous silicon thin film transistors

Antoine Kahn, Sigurd Wagner, Henning Sirringhaus

Proceedings Volume 3014, (1997) https://doi.org/10.1117/12.270301

KEYWORDS: Copper, Chromium, Metals, Plasma enhanced chemical vapor deposition, Transistors, Annealing, Diffusion, Glasses, Thin films, Oxides

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Showing 5 of 12 publications

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