transparentelectronics-140228095518-phpapp02
DESCRIPTION
transparent electronicsTRANSCRIPT
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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.
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There are two technologies which preceded
and underlie transparent electronics:
1. Transparent Conducting Oxides (TCOs)
2. Thin Film Transistors (TFTs)
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Transparent Conducting Oxides TCOs)
TCOs constitute an unusual class of materials
possessing two physical properties (generally
considered mutually exclusive):
1. High optical transparency. ( Eg>3.1eV)
2. High electrical conductivity.
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Transparent electronic devices
Transparent Passive devices
Transparent Active devices
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Transparent Passive devices
Transparent Thin Film Resistors
Transparent Thin Film Capacitors
Transparent Thin Film Inductors
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Transparent Thin Film Resistors
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Transparent Thin Film Capacitors
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Energy band in a Schottky barrier
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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:
a) Bottom gate
b)Top gate
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Possible structure, (a) Bottom gate, and
(b) Top gate.
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Operation of a bottom gate TFT
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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 temperature processing Technological immaturity
Free real estate
Passive availability (R & C)
Robust stable inorganic materials
Safe, nontoxic materials
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Applications
Active Matrix LCD (AMLCD).
Active Matrix Organic Light Emitting Device
display backplane (AMOLED).
Value added glass.
Transparent electronics on opaque substrates.
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UV detectors and arrays
• Transparent solar cells
• UV detectors for spectrally resolved imaging.
• Security applications:
Invisible cameras and
Invisible RFID’s
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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.
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