FORCE SENSORS BASED ON QUANTUM             MECHANICAL TUNNELING:     A new family of Metal-Oxide Polymer Devices          ...
Metal-Oxide-Polymer Sensors and Devices                Point of Contact: Robert Dahlgren, robert.p.dahlgren@nasa.gov (650)...
Description, Goals, and Objectives• Concept Description                                             Applied force   –    S...
Concept, Customers, and Team                                                          F• Concept Image   – Stack of 1018 S...
Technical Approach, Significance, and Application• Technical Approach   –   Measure 2-terminal I-V Curves   –   Measure fo...
Milestones, Products, Resources• Benefits / Outcome   – Lead to a new family of sensors, transducers, and electronic devic...
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Force Sensors Based on Quantum Mechanical Tunneling

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Force Sensors Based on Quantum Mechanical Tunneling

  1. 1. FORCE SENSORS BASED ON QUANTUM MECHANICAL TUNNELING: A new family of Metal-Oxide Polymer Devices Robert Dahlgren Vern Vanderbilt Code SGEARCTek-3 October 16th, 2012
  2. 2. Metal-Oxide-Polymer Sensors and Devices Point of Contact: Robert Dahlgren, robert.p.dahlgren@nasa.gov (650) 810-0229 Description/Goals/Objectives/Issues/TRL Concept Image/Customers/TeamConcept Description: Concept Image: - Metal Oxide Polymer Sensors and DevicesGoals & Objectives: - Model the device behavior and application spaceIssues: Customers: - New technology and physics - Aerospace and industrial usersTRL: 1 Team: - V. Vanderbilt (SGE), R. Dahlgren, N. Kobayashi Technical Approach/Significance/ApplicationTechnical Approach: -Significance: -Application: -Benefit/Outcome: -
  3. 3. Description, Goals, and Objectives• Concept Description Applied force – Serendipitous discovery during rock testing – Voltage output a function of applied force F – Metal-Oxide Polymer sensors and devices + – Native or engineered oxide barrier• Goals and Objectives V – Metal Metal – Model the physics of the device – Measure I-V characteristic of Schottky junction – Model electron transport kinetics – Explore advantages/disadvantages – Identify potential applications of sensor Polyethylene (HDPE)• Issues – New physics beyond simple capacitive sensor – Role of oxide quantum mechanical barrier Optional oxide layers not shown• TRL – TRL1 3
  4. 4. Concept, Customers, and Team F• Concept Image – Stack of 1018 Steel plates Metal – Thin (~250 um) high density HDPE – polyethylene film Metal HDPE – – Double layers ~ 40 cm2 each Metal• Customer – Users of discrete sensors – Users of distributed sensors – Users of conformable force sensor e.g. sensing of micrometeoroid impact• Team 60 Ton – Vern Vanderbilt, Ph.D. Press (N244) – Robert Dahlgren, Ph.D. – Nobuhiko Kobayashi, Ph.D. 4
  5. 5. Technical Approach, Significance, and Application• Technical Approach – Measure 2-terminal I-V Curves – Measure force-dependent (3-terminal) I-V Curves – Develop mathematical model – Evaluate feasibility of sensor (SNR, error budget, linearity...) – Evaluate feasibility of tunnel barrier devices• Significance – Scale factor independent of many factors – First report of oxide-barrier modification of force signal – Self-powered (or ultra-low power) sensor – No probe signal needed• Applications – Force, pressure, weight sensors – Pressure tanks and vessels – Smart structures and skins 5
  6. 6. Milestones, Products, Resources• Benefits / Outcome – Lead to a new family of sensors, transducers, and electronic devices. – Won’t be GHz due to low density and mobility of electrons in HDPE.• Milestones Date after award – M1: First-order differential equations +4 weeks – M2: Transit time, mobility effects +8 weeks – M3: Effect of native oxide tunnel barrier +12 weeks• Products – Load cell, pressure sensor, force sensor• Resources – Electrometer and data acquisition – 0.25 FTE for 6 months (Vanderbilt) – 0.25 FTE for 3 months (Dahlgren) via SJSURF or SETI 6

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