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Effect of substrate curvature on thickness distribution of polydimethylsiloxane thin film in spin coating process
- Source :
- Chinese Physics B. 27:068104
- Publication Year :
- 2018
- Publisher :
- IOP Publishing, 2018.
-
Abstract
- The polymer spin coating is critical in flexible electronic manufaction and micro-electro-mechanical system (MEMS) devices due to its simple operation, and uniformly coated layers. Some researchers focus on the effects of spin coating parameters such as wafer rotating speed, the viscosity of the coating liquid and solvent evaporation on final film thickness. In this work, the influence of substrate curvature on film thickness distribution is considered. A new parameter which represents the edge bead effect ratio (r e) is proposed to investigate the influence factor of edge bead effect. Several operation parameters including the curvature of the substrate and the wafer-spin speed are taken into account to study the effects on the film thickness uniformity and edge-bead ratio. The morphologies and film thickness values of the spin-coated PDMS films under various substrate curvatures and coating speeds are measured with laser confocal microscopy. According to the results, both the convex and concave substrate will help to reduce the edge-bead effect significantly and thin film with better surface morphology can be obtained at high spin speed. Additionally, the relationship between the edge-bead ratio and the thin film thickness is like parabolic curve instead of linear dependence. This work may contribute to the mass production of flexible electronic devices.
- Subjects :
- Spin coating
Materials science
Polydimethylsiloxane
General Physics and Astronomy
02 engineering and technology
Substrate (printing)
engineering.material
Edge (geometry)
010402 general chemistry
021001 nanoscience & nanotechnology
Curvature
01 natural sciences
0104 chemical sciences
Condensed Matter::Soft Condensed Matter
chemistry.chemical_compound
Coating
chemistry
engineering
Wafer
Composite material
Thin film
0210 nano-technology
Subjects
Details
- ISSN :
- 16741056
- Volume :
- 27
- Database :
- OpenAIRE
- Journal :
- Chinese Physics B
- Accession number :
- edsair.doi...........f2e18e8957af4199fad97965922334b1