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Title: Spatial atomic layer deposition: Performance of low temperature H{sub 2}O and O{sub 3} oxidant chemistry for flexible electronics encapsulation

Water and oxygen were compared as oxidizing agents for the Al{sub 2}O{sub 3} atomic layer deposition process using spatial atomic layer deposition reactor. The influence of the precursor dose on the deposition rate and refractive index, which was used as a proxy for film density, was measured as a function of residence time, defined as the time which the moving substrate spent within one precursor gas zone. The effect of temperature on the growth characteristics was also measured. The water-based process gave faster deposition rates and higher refractive indices but the ozone process allowed deposition to take place at lower temperatures while still maintaining good film quality. In general, processes based on both oxidation chemistries were able to produce excellent moisture barrier films with water vapor transmission rate levels of 10{sup −4} g/m{sup 2} day measured at 38 °C and 90% of relative humidity on polyethylene naphthalate substrates. However, the best result of <5 × 10{sup −5} was obtained at 100 °C process temperature with water as precursor.
Authors:
; ;  [1] ;  [2]
  1. Advanced Surface Technology Research Laboratory Team (ASTRaL), Laboratory of Green Chemistry, Lappeenranta University of Technology, Sammonkatu 12, Mikkeli 50130 (Finland)
  2. R and D Center for Low-Cost Plasma and Nanotechnology Surface Modification, Masaryk University, Kotlářská 2, 611 37 Brno (Czech Republic)
Publication Date:
OSTI Identifier:
22392186
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films; Journal Volume: 33; Journal Issue: 3; Other Information: (c) 2015 American Vacuum Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; ALUMINIUM OXIDES; CHEMISTRY; DENSITY; DEPOSITION; ENCAPSULATION; FILMS; HUMIDITY; OXIDATION; OXIDIZERS; OZONE; PERFORMANCE; POLYETHYLENES; PRECURSOR; REFRACTIVE INDEX; SUBSTRATES; WATER; WATER VAPOR