Misfit p-type transparent conductive oxide (TCO) films, methods and applications

Patent metadata

Field	Value
Publication number	US-10629321-B2
Application number	US-201515302319-A
Country	US
Kind code	B2
Filing date	Apr 9, 2015
Priority date	Apr 9, 2014
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A p-type transparent conductive oxide (TCO) mixed metal oxide material layer formed upon a substrate has a formula M1xM2yOz generally, CaxCoyOz more specifically, and Ca3Co4O9 most specifically. Embodiments provide that the p-type TCO mixed metal oxide material may be formed absent an epitaxial crystalline relationship with respect to the substrate while using a sol-gel synthesis method that uses a chelating polymer material and not a block copolymer material.

First claim

What is claimed is:

1. A p-type transparent conducting structure generated via solution-based synthesis, the structure comprising:
an optically transparent substrate; and
an at least partially crystalline p-type mixed metal oxide material having a chemical composition Ca x Co y O z and located upon the substrate without an epitaxial crystalline relationship with respect to the substrate, wherein when x is normalized to unity y ranges from about 1.2 to about 1.5, and z is selected consistent with x and y, considering the oxidation states of Ca and Co;
wherein the structure has an optical transparency, and further wherein the structure exhibits p-type conductivity greater than 1 S/cm.

2. The structure of claim 1 , wherein:
the at least partially crystalline p-type mixed metal oxide material has the chemical composition Ca 3 Co 4 O 9 .

3. The structure of claim 1 wherein:
the mixed metal oxide material has an optical transparency in the visible range from about 31 to about 67 percent; and
the mixed metal oxide material comprises a misfit crystal material.

4. The structure of claim 3 wherein the mixed metal oxide material shows no more than five peaks in an x-ray diffraction spectrum from 10 to 40 degrees position of 2⊖.

5. The structure of claim 1 , wherein the mixed metal oxide material has an optical transparency in the near infrared range greater than 85%.

6. The structure of claim 1 , wherein the structure exhibits conductivity greater than 15 S/cm.

Assignees

• Univ Cornell

Inventors

• Aksit Mahmut
• Robinson Richard D

Classifications

• B05D2203/30

  Other inorganic substrates, e.g. ceramics, silicon · CPC title

• B05D1/005

  Spin coating · CPC title

• B05D3/0254

  After-treatment · CPC title

• H01B1/08 Primary

  oxides · CPC title

• H01L31/022466

  Electricity · mapped topic