Carbon-Based Materials for Flexible Electronics · Carbon-Based Materials for Flexible Electronics...
Transcript of Carbon-Based Materials for Flexible Electronics · Carbon-Based Materials for Flexible Electronics...
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Carbon-Based Materials for Flexible Electronics
Dr. Nan Liu Professor Zhenan Bao Group
Department of Chemical Engineering, Stanford University Sep 10, 2015
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Flexible Electronics in Life
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Approach to Flexible Electronics
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Our Approach to Flexible Electronics
Silicon mould
ITO/PET
On OffFly on sensor
Cap
acita
nce
(× 1
0¬1
1 F)
10 20 30
Time (s)
40 50
2.88
2.87
2.86
2.85
2.84
2.89
2.83
PETApply pressure
ITO
Microstructured PDMS
Laminate
Pil2TSi semiconductingpolymer Thin PDMS
BCB
Polyimide
Au source / drain
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Carbon-Based Materials: CNTs
Source/Drain
0
1
2
3
4
5
(1,1)(1,0)(0,1)
Vol
tage
(V)
(0,0)
0
1
2
3
4
5
(1,1)(1,0)(0,1)
Vol
tage
(V)
(0,0)
NAND Gate
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Highly Robust All-CNT Stretchable Transistors
0->100% strain
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Carbon-Based Materials: Graphene
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Better Interaction between Carbon-Based Materials
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Graphene-CNT Stretchable Transistors
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Graphene toward Ideal Electronic Materials
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Importance of Controlled Fermi Level
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Design New n-type Dopant
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Process of Doping Graphene
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Transport Behavior Before and After n-doping
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UPS Study Before and After n-doping
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Application 1: Inverter
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Application 2: p-n Junction
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Fabrication of Graphene p-n Junctions
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Formation of p-n Junctions
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Photoresponse of p-n Junctions
Photocurrent density (10-4A/cm2) †
Photoresponsivity (mA/W)
(5.50±0.47) 104 (1.20±0.11) ) 104
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Transparent and Flexible IR Photodetectors
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Summary I
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Outline
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Why Bandgap?
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Bandgap in GNR
Eg(eV ) =0.8
w(nm)
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Synthetic Approaches to GNRs — Bottom up
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DNA Bio-template to GNRs
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GNRs from DNA
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Electrospinning
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Electrospun Polymer to GNRs
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Overview of the GNRs - Morphology
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Overview of the GNRs – Electronic Properties
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Effect of Chemical Structure on the Graphitization Degree
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Ω
Effect of Chemical Structure on the Graphitization Degree
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Summary II
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Conclusion
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Acknowledgement
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Any questions?