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Temperature Dependent Electrical Properties in Oxide Thin Films

Temperature Dependent Electrical Properties in Oxide Thin Films. Timothy Nagle Gerald R. Taylor Jr. Physics Department James Madison University AAPT - Chesapeake Section Loyola College Baltimore, MD April 21, 2001. Outline. Introduction Why study ITO films? Techniques

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Temperature Dependent Electrical Properties in Oxide Thin Films

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  1. Temperature Dependent Electrical Properties in Oxide Thin Films Timothy Nagle Gerald R. Taylor Jr. Physics Department James Madison University AAPT - Chesapeake Section Loyola College Baltimore, MD April 21, 2001

  2. Outline • Introduction • Why study ITO films? • Techniques • Methods and Apparatus • Results • Electrical properties and microstructure • Conclusions • Future work

  3. Indium Tin Oxide (ITO) • Deposited by rf magnetron sputtering • 2738-3811 Å thickness • Hall effect measurements • 77K, 273K, 298K • r, Ne, m, RH • How does T effect r? • 77K - 298K • What is the microstructure?

  4. Hall Effect • Current (I) normal to magnetic field (B) • Force (F) acts on charge carrier • F normal to I and B • Hall Voltage (VHall) between A and A’

  5. Technique

  6. Hall Effect Data • Carrier concentration • Ne = 2 × 1021 cm-3 • Little variation with T (77K<T<298K) • Mobility • m = 24 cm2/V×s • Hall Coefficient • RH = 2.5 × 10-3 cm3/C • negative charge carriers

  7. Hall Coefficient vs. Temperature

  8. Resistivity vs. Temperature

  9. Conductivity vs. Inverse Temperature

  10. Optical Characterization • Absorption at 400 nm • Photons absorbed into e • e = h×c/l = 3.10 eV

  11. ITO Microstructure • ~6000 Å thick • Feature height • 10-30 nm • Grain size • 130 nm • Mean Free Path • l=t×vth • l= 10 nm

  12. Conclusions • Temperature range 77K - 298K • little variation in Ne, m, RH • ITO behaves like impurity metal or degenerate semiconductor • r increases linearly with T • phonon scattering • 130 nm grain size • l = 10 nm << grain size

  13. Acknowledgements • Dr. David Lawrence • Geoff Stenger • Dr. Chris Hughes • Dr. Brian Augustine • Brian Woodley

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