1 / 22

Transparent Electronics

Transparent Electronics. Submitted by, Sajas K.K. Roll no: 18 S5 EC. Guided by Miss . Shahida. Introduction What is transparent electronics?

jagger
Download Presentation

Transparent Electronics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TransparentElectronics Submitted by, Sajas K.K. Roll no: 18 S5 EC Guided by Miss. Shahida

  2. Introduction What is transparent electronics? • In transparent electronics the usual opaque semiconductor materials forming the basis for electronic device fabrication is replaced with transparent materials.

  3. There are two technologies which preceded and underlie transparent electronics: • Transparent Conducting Oxides (TCOs) • Thin Film Transistors (TFTs)

  4. Transparent Conducting Oxides TCOs) • TCOs constitute an unusual class of materials possessing two physical properties (generally considered mutually exclusive): • High optical transparency. ( Eg>3.1eV) • High electrical conductivity.

  5. Transparent Passive devices • Transparent Thin Film Resistors • Transparent Thin Film Capacitors • Transparent Thin Film Inductors

  6. Transparent Thin Film Resistors

  7. Resistive material: ITO (Indium Tin Oxide) • Typical sheet resistance ~ 10- • Conductivity of TCO’s depends on number of oxygen vacancies ( and metal atoms occupying interstitial sites.

  8. Transparent Thin Film Capacitors

  9. Most insulators are transparent. • Contact layer is made of highly conducting TCOs (ITO).

  10. Transparent Thin Film Inductors • Hard to realize due to poor conductivity of TCO’s compared to metals. • High L requires larger number of turns which in turn results in increased parasitic resistance.

  11. Schottky Barriers • Formed from metal (anode)-semiconductor (cathode) junction. • Space charge region (depletion region) and potential barrier formation due to difference in work function of metal and semiconductor. • Schottky barrier height , where Schottky barrier height work function of metal Electron affinity of semiconductor

  12. Energy band in a Schottky barrier

  13. Transparent Thin Film Transistors • Constitutes the heart of transparent electronics • Channel is formed from highly insulating, wide band gap transparent semiconductor(ZnO). • Source, drain and gate contacts are made from highly conductive TCO (ITO). • Two possible configurations are: • Bottom gate • Top gate

  14. Possible structure, (a) Bottom gate, and (b) Top gate.

  15. Operation of a bottom gate TFT

  16. Strengths and Weaknesses

  17. Applications • Active Matrix LCD (AMLCD). • Active Matrix Organic Light Emitting Device display backplane (AMOLED). • Value added glass. • Transparent electronics on opaque substrates.

  18. UV detectors and arrays • Transparent solar cells • UV detectors for spectrally resolved imaging. • Security applications: Invisible cameras and Invisible RFID’s

  19. Conclusion • Started as a mere electrical device technology during world war 2, transparent electronics now holds the key for many future advancements in security, entertainment efficient utilization of energy.

  20. Reference • ‘Transparent Electronics ’, Springer publications, J.F.Wager, D. A. Keszler, R. E. Presley. • ‘Transparent electronics: from synthesis to applications’, Wiley publications: Antonio Facchetti, Tobin J. Marks

  21. Thank you

More Related