Articles of controllably bonded sheets and methods for making same
Described herein are articles and methods of making articles, including a first sheet and a second sheet, wherein the thin sheet and carrier are bonded together using a coating layer, preferably a hydrocarbon polymer coating layer, and associated deposition methods and inert gas treatments that may be applied on either sheet, or both, to control van der Waals, hydrogen and covalent bonding between the sheets. The coating layer bonds the sheets together to prevent formation of a permanent bond at high temperature processing while at the same time maintaining a sufficient bond to prevent delamination during high temperature processing.
1. An article comprising:
a first sheet comprising a first sheet bonding surface; and
a coating layer comprising a first coating layer bonding surface and a second coating layer bonding surface, the coating layer comprising a polymerized hydrogenated amorphous hydrocarbon compound, the coating layer comprising an intensity ratio (D/G ratio) of a peak (D band) appearing in a range of 1350 to 1400 cm·1 to a peak (G band) appearing in a range of 1530 to 1600 cm·1 of a Raman spectrum of the coating layer in a range of about 0.5 to about 0.6, and at least one of the following:
a refractive index above about 1.8;
an optical band gap of less than 2 eV.
2. The article of claim 1 , further comprising a second sheet comprising a second sheet bonding surface, wherein the second coating layer bonding surface is bonded with the second sheet bonding surface.
3. The article of claim 2 , wherein the first sheet is a glass sheet and/or the second sheet is a glass sheet.
4. The article of claim 1 , wherein the coating layer has an average thickness of less than about 10 nm and is optionally is a single layer.
5. The article of claim 1 , the first sheet having an average thickness less than about 200 μm.
6. The article of claim 1 , wherein the first coating layer bonding surface is bonded with the first sheet bonding surface with a bond energy of equal to or less than 600 mJ/m2 after holding the article in a furnace at a temperature of 600° C. for 10 minutes in a nitrogen atmosphere.
7. The article of claim 1 , the change in percent bubble area of the coating layer being less than or equal to about 10 percent according to Outgassing Test #1 after holding the article in a furnace at a temperature of 600° C. for 10 minutes in a nitrogen atmosphere.
8. The article of claim 1 , the change in percent bubble area of the coating layer being less than 10 percent according to Outgassing Test #1 after holding the article in a furnace at a temperature of 500° C. for 10 minutes in a nitrogen atmosphere.
9. The article of claim 1 , wherein the coating layer has an average thickness of less than 5 nm.