Resume

• 2004

  PhD

  Electrical and Computer Engineering

  Member of American Physical Society\nMember of Sigma Pi Sigma - The National Honor Society

• 2002

  MS

  Physics

  Member of Society of Physics Students - University of Louisville Chapter\nMember of Society of Physics Students - National

• 1999

  MS

  Electronics and Computer Technology

• 1995

  BE

  Electronics and Telecommunication

  Shivaji University

• Characterization

  CVD

  Scanning Electron Microscopy

  Sensors

  Evaporation

  Microfabrication

  Nanomaterials

  Photolithography

  Device Physics

  Thin Films

  Chemical Vapor Deposition

  Device Characterization

  Physics

  Spectroscopy

  Atomic Force Microscopy

  Nanoparticles

  Sputtering

  AFM

  MEMS

  Semiconductors

  Buckled Topography to Enhance Light Absorption in Thin Film Organic Photovoltaics Comprising CuPc/C60 Bilayer Laminates

  Jan Genzer

  Michael D Dickey

  Jon-Paul Maria

  Jay Lewis

  Ethan Klem

  Arif O. Gozen

  Abstract: \"This paper demonstrates a simple process utilizing thin-film instabilities to enhance light absorption in OPVs in a way that is compatible with planar processing and the customary thermal annealing steps. Placing a thin

  transparent polystyrene (PS) film between the glass substrate and the transparent conductive indium tin oxide (ITO) electrode results in the formation of periodic surface buckles in the PS layer due to induced strain caused by thermal expansion mismatch between the ITO and PS films. OPVs comprising bilayer laminates of copper phthalocyanine (CuPc) and fullerene (C60) deposited onto buckled the ITO/PS substrate show enhanced light absorption due to the longer path-length and improved power conversion efficiency (20%) relative to a similar planar device. This approach is appealing because it takes advantage of naturally-occurring surface topography (i. e.

  buckling) without the need for any sophisticated patterning. This work is distinguished from other buckling strategies for OPVs by the use of ITO as a transparent

  conductive electrode and the absence of additional processing steps.\"

  Buckled Topography to Enhance Light Absorption in Thin Film Organic Photovoltaics Comprising CuPc/C60 Bilayer Laminates

  Michael Dickey

  B. Pourdeyhimi

  William Barnes

  Robin Mays

  Ju-Hee So

  The fabrication and characterization of fibers that are ultrastretchable and have metallic electrical conductivity are described. The fibers consist of a liquid metal alloy

  eutectic gallium indium (EGaIn)

  injected into the core of stretchable hollow fibers composed of a triblock copolymer

  poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) resin. The hollow fibers are easy to mass-produce with controlled size using commercially available melt processing methods. The fibers are similar to conventional metallic wires

  but can be stretched orders of magnitude further while retaining electrical conductivity. Mechanical measurements with and without the liquid metal inside the fibers show the liquid core has a negligible impact on the mechanical properties of the fibers

  which is in contrast to most conductive composite fibers. The fibers also maintain the same tactile properties with and without the metal. Electrical measurements show that the fibers increase resistance as the fiber elongates and the cross sectional area narrows. Fibers with larger diameters change from a triangular to a more circular cross-section during stretching

  which has the appeal of lowering the resistance below that predicted by theory. To demonstrate their utility

  the ultrastretchable fibers are used as stretchable wires for earphones and for a battery charger and perform as well as their conventional parts.

  Ultrastretchable Fibers with Metallic Conductivity using a Liquid Metal Alloy Core

  S. Y. Wu

  C. S. Jayanthi

  W. Tian

  Ming Yu

  Adam Willitsford

  Accurate and reliable detection of hypergolic fuels such as hydrazine (N2H4) and its derivatives is vital to missile defense

  aviation

  homeland security

  and the chemical industry. More importantly these sensors need to be capable of operation at low temperatures (below room temperature) as most of the widely used chemical sensors operate at high temperatures (above 300 °C). In this research a simple and highly sensitive single walled carbon nanotube (SWNT) network sensor was developed for real time monitoring of hydrazine leaks to concentrations at parts per million levels. Upon exposure to hydrazine vapor

  the resistance of the air exposed nanotubes (p-type) is observed to increase rapidly while that of the vacuum-degassed nanotubes (n-type) is observed to decrease. It was found that the resistance of the sample can be recovered through vacuum pumping and exposure to ultraviolet light. The experimental results support the electrochemical charge transfer mechanism between the oxygen redox couple of the ambient and the Fermi level of the SWNT. Theoretical results of the hydrazine-SWNT interaction are compared with the experimental observations. It was found that a monolayer of water molecules on the SWNT is necessary to induce strong interactions between hydrazine and the SWNT by way of introducing new occupied states near the bottom of the conduction band of the SWNT.

  Hypergolic Fuel Detection using Single Walled Carbon Nanotube Networks.

  -\tFabricated organic photovoltaics and transparent electrodes on polymeric substrates with microstructures\n-\tImproved light absorption using microstructures based on 50% increase in current density of photovoltaics and 20% increase in power conversion efficiency\n

  Jay Lewis

  Ethan Klem

  Sharvil

  Desai

  Indiana State University

  ITT Educational Services

  Inc.

  The Ohio State University

  University of Louisville

  North Carolina State University

  Taught four lab sections in undergraduate engineering physics courses.

  University of Louisville

  Process Engineer

  Assembling and Characterization of an Ion Mill System.\nTeaching/Training new students on various equipments.

  University of Louisville

  Adjuct Instructor

  Teaching Courses in Analog Electronics and Electronic Communication.

  ITT Educational Services

  Inc.

  The Ohio State University

  Teach undergraduate courses in Physics

  Lecturer

  Columbus

  Ohio Area

  Senior Research Associate

  Columbus

  Ohio Area

  The Ohio State University

  Fabrication of Liquid Metal Interconnects for devices on flexible printed circuit board.

  North Carolina State University

  Graduate Research Assistant

  Assembly and characterization of various nanomaterial (SWNT

  DWNT

  MWNT

  semiconducting nanowires) synthesis systems like chemical vapor deposition system and pulsed vapor deposition system.\nCharacterization of various nanomaterials using SEM

  EDS

  RAMAN and AFM.\nPurification of bulk SWNTs using oxidation

  acid refluxing and annealing.\nMeasurements of Electrical

  Thermal

  Thermo-electrical

  Magnetic properties of various nanomaterials (graphene

  nanotubes

  nanowires and nanoparticles).\nMeasurements of Field and Thermionic Emission properties of carbon nanomaterials (SWNT

  MWNT

  Pipettes).\nCharacterizing the functionalization techniques for SWNT using plasma treatment and metal decoration.\nFabrication of devices with 2 probe/4 probe electrodes

  interdigitated electrodes

  and field effect transistor configuration using e-beam lithography and photolithography for various individual and networked SWNTs

  graphene sheets and semiconducting nanowires for the study of these materials as Gas/Chemical Sensors.

  University of Louisville

  North Carolina State University

  Study the effect of high aspect ratio hierarchical topography on the light harvesting by photovoltaic devices.\nConcept

  design and characterization of various stretchable polymers for their applications in RF electronics.\nManaging day to day activities of the lab.\nMentoring undergraduate students.

  Post Doctoral Research Associate

  Raleigh-Durham

  North Carolina Area

  Managed a fully equipped computer laboratory

  which houses 30 Microsoft Windows 2000 and Windows NT based desktop computers. \nProvided computer software support to both graduate and undergraduate students. Provided IT help for the lab.\nTutored undergraduate students in Mathematics

  Statistics

  Physics

  Computer Science

  Electronics and Computer Technology.\nDesigned a Java-equipped web page for the Student Academic Support Center.

  Indiana State University

  Lecturer

  Department of Physics

  The Ohio State University