Complimentary polymer electrochromic device
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Publication Number
US-9594284-B2
Publication Date
2017-03-14
Expiration Date
Abstract
A complimentary polymer or “dual-polymer” electrochromic device and methods of preparing the same are provided.
Core Innovation
The invention relates to a method for preparing an electrode in which the electrode comprises a polymer comprising N,N′-diphenyl benzidine monomer. The method prepares the polymer electrode by providing a deposition solution comprising the N,N′-diphenyl benzidine monomer and uniformly depositing the polymer onto a substrate in contact with the deposition solution to yield the electrode.
The deposition solution comprises dimethylformamide and acetonitrile in a ratio of at least about 6:1 by volume, respectively. Polymers comprising N,N′-diphenyl benzidine monomer can be prepared by uniformly depositing on a substrate using a deposition solution with a specified solvent composition.
Dependent refinements specify that the polymer can include additional monomers selected from diphenyl amine and 4-aminobiphenyl in the deposition solution. The disclosure also constrains the deposition formulation by specifying molar ratio ranges for N,N′-diphenyl benzidine monomer, diphenyl amine monomer, and 4-aminobiphenyl monomer.
Claims Coverage
Independent inventive coverage is provided by a single independent claim directed to a method for preparing an electrode using uniform deposition of a N,N′-diphenyl benzidine polymer from a solvent-defined deposition solution. The claim family includes dependent refinements that further specify substrate selection, optional co-monomers, monomer molar ratio ranges, and optional salt components.
Uniform deposition of a polymer comprising N,N′-diphenyl benzidine monomer
A method for preparing an electrode comprising a polymer comprising N,N′-diphenyl benzidine monomer, comprising providing a deposition solution comprising the N,N′-diphenyl benzidine monomer and uniformly depositing the polymer onto a substrate in contact with the deposition solution to yield the electrode.
Deposition solution solvent ratio of dimethylformamide to acetonitrile
The deposition solution comprises dimethylformamide and acetonitrile in a ratio of at least about 6:1 by volume, respectively.
Overall, the claim coverage centers on forming an electrode by uniformly depositing a polymer comprising N,N′-diphenyl benzidine monomer from a deposition solution whose solvent composition is defined by dimethylformamide/acetonitrile at a volume ratio of at least about 6:1, with dependent refinements specifying co-monomers, monomer molar ratios, substrate options, and optional salt constituents.
Stated Advantages
Improving reversibility
Improving switching speed
Improving contrast
Minimizing degradation versus prior art dual-polymer mismatched systems
Documented Applications
Dual-polymer electrochromic device using a cathodically coloring conducting polymer on a first transparent conductive electrode and an anodically coloring poly(aromatic amine) on a second transparent conductive electrode separated by an electrolyte.
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