Barium copper sulfur fluoride transparent conductive thin films and bulk material
A bulk barium copper sulfur fluoride (BCSF) material can be made by combining Cu 2 S, BaS and BaF 2 , heating the ampoule between 400 and 550° C. for at least two hours, and then heating the ampoule at a temperature between 550 and 950° C. for at least two hours. The BCSF material may be doped with potassium, rubidium, or sodium. Additionally, a p-type transparent conductive material can comprise a thin film of BCSF on a substrate where the film has a conductivity of at least 1 S/cm. The substrate may be a plastic substrate, such as a polyethersulfone, polyethylene terephthalate, polyimide, or some other suitable plastic or polymeric substrate.
1. A method for making a barium copper sulfur fluoride (BCSF) transparent conductive thin film, comprising:
(a) forming a sputter target by hot pressing bulk BCSF; and
(b) sputtering a BCSF thin film from the target onto a substrate;
wherein after sputtering, the film is soaked in water for at least 30 seconds and then heated at 100° C. for 5 minutes; and
wherein the resulting film has a conductivity of 800 S/cm.
2. The method of claim 1 , wherein the BCSF crystalline phase is cubic in space group Fm3m.
3. The method of claim 1 , wherein the substrate is a plastic substrate.
4. The method of claim 3 , wherein the plastic substrate is selected from group consisting of polyethersulfone, polyethylene terephthalate, and polyimide substrates.
5. A method for making a barium copper sulfur fluoride (BCSF) transparent conductive thin film, comprising:
(a) forming a sputter target by hot pressing Cu 2 S, BaS and BaF 2 powders in stoichiometric proportions; and
(b) sputtering a BCSF thin film from the target onto a substrate;
wherein after sputtering, the film is soaked in water for at least 30 seconds and then heated at 100° C. for 5 minutes; and
wherein the resulting film has a conductivity of 800 S/cm.
6. The method of claim 5 , wherein the BCSF crystalline phase is cubic in space group Fm3m.
7. The method of claim 5 , wherein the substrate is a plastic substrate.
8. The method of claim 7 , wherein the plastic substrate is selected from group consisting of polyethersulfone, polyethylene terephthalate, and polyimide substrates.