Transparent-Electronics

Views:
 
     
 

Presentation Description

No description available.

Comments

By: habiba2211 (11 month(s) ago)

heyy..plzz send me this ppt..its the most complete one among all others..my email id is habiba2211@gmail.com..thank u

Presentation Transcript

Transparent Electronics: 

Guided by Miss. Shahida Transparent Electronics Submitted by, Sajas K.K. Roll no: 18 S5 EC

PowerPoint Presentation: 

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.

PowerPoint Presentation: 

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

PowerPoint Presentation: 

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.

PowerPoint Presentation: 

Transparent Passive devices Transparent Thin Film Resistors Transparent Thin Film Capacitors Transparent Thin Film Inductors

PowerPoint Presentation: 

Transparent Thin Film Resistors

PowerPoint Presentation: 

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.

PowerPoint Presentation: 

Transparent T hin Film Capacitors

PowerPoint Presentation: 

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

PowerPoint Presentation: 

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.

PowerPoint Presentation: 

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

PowerPoint Presentation: 

Energy band in a Schottky barrier

PowerPoint Presentation: 

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

PowerPoint Presentation: 

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

PowerPoint Presentation: 

Operation of a bottom gate TFT

PowerPoint Presentation: 

Strengths and Weaknesses Strengths Weaknesses Visible transparency High resistance of TCO’s Large area Lack of complementary devices Low cost (solution based deposition and printing) Low frequency of operation.(KHz to few MHz). f T = Low temperature processing Technological immaturity Free real estate Passive availability (R & C) Robust stable inorganic materials Safe, nontoxic materials Strengths Weaknesses Visible transparency High resistance of TCO’s Large area Lack of complementary devices Low cost (solution based deposition and printing) Low temperature processing Technological immaturity Free real estate Passive availability (R & C) Robust stable inorganic materials Safe, nontoxic materials

PowerPoint Presentation: 

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

PowerPoint Presentation: 

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

PowerPoint Presentation: 

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.

PowerPoint Presentation: 

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

PowerPoint Presentation: 

Thank you