Glancing Angle Deposition ( GLAD )
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Transcript of Glancing Angle Deposition ( GLAD )
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Glancing Angle Deposition( GLAD)
Reporter: Zhibin Luo
Jul 11th 2013
Progress report
Glancing angle deposition JVSTA 2007 Matthew M. Hawkeye
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Substrate
Vapor
Deposition Source
UHV
Thin Film Deposition
PVD CVD
Atomic Layer Deposition Chem. Rev. 2010 Steven M. George
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The atoms are more strongly bound to the substrate than to each other
The interaction between the atoms is greater than the interaction with the substrate
Atoms will initially cover the surface in monolayers due to the strong interaction with the substrate, but after the deposition of one or several layers, islanding will occur
Initial growth of the thin film
Layer growth
Island growth
Layer plus island growth
Substrate
Substrate
Substrate
Atoms
Atoms
Atoms
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Structure zone models
Substrate temperature T/Tm
The temperature is too low for any significant diffusion to occur
Surface diffusion strongly influences the growth
There is sufficient energy for bulk
diffusion to occur
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Substrate
Vapor
Deposition Source
Substrate
Inciden
t
Vapor F
lux
α
ψ
UHV
GLAD
Glancing Angle Deposition
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Archetypal GLAD fabricated microstructures
Tilted columns
Vertical columnsHelical columns
Zig-zag columns
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Self-shadowing
StageⅡ
StageⅠ
tanα=2tanβ
The atoms evaporate from the surface or buried by the arrival of new atoms
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Deposition onto nonplanar substrates
Improving the uniformity
Postdeposition processing or initial seeds for column growth
Embossing 、 laser-direct write lithography 、 monolayers of self-assembled nanospheres、optical lithography, etc
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Archetypal GLAD fabricated microstructures
Tilted columns
Vertical columnsHelical columns
Zig-zag columns
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PhiSweep
Orientation Sweep axis Angle from central sweep axis
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Orientation Sweep axis 90°turn to create square helix
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Film properties and applications
First, because the films possess an internal microstructure, the exposed surface area of the film is dramatically higher than in a dense coating
Second, the particular geometry of the micro and nanostructures produced with the GLAD technique can directly impact various physical properties
Dichrosim、 birefringence and anisotropic resitivity
Dye sensitized solar cells( DSSCs)
Sensor devices
Photocatalyze the degradation of organic chemicals
Materials for electrochemical supercapacitors
Surface chemistry applications
Applications
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It’s my great honour to have your precious opinions.