Electro-deposited vanadium oxide as a counter-electrode for PProDOT-Me2 based electrochromic devices (ECDs)

Calen Kaneko; Chunye Xu; Lu Liu; Dai Ning; Minoru Taya

doi:10.1117/12.599911

6 May 2005 Electro-deposited vanadium oxide as a counter-electrode for PProDOT-Me₂ based electrochromic devices (ECDs)

Calen Kaneko, Chunye Xu, Lu Liu, Dai Ning, Minoru Taya

Proceedings Volume 5759, Smart Structures and Materials 2005: Electroactive Polymer Actuators and Devices (EAPAD); (2005) https://doi.org/10.1117/12.599911
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

Abstract

A preparation and characterization of thin film vanadium oxide for use as a transparent ion storage layer/counter-electrode in organic ECDs is reported. A cathodic polymer film, Poly[3,3-dimethyle-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine] (PProDOT-Me₂) was used as the electrochromic material. Counter-electrodes were prepared using a sol-gel method and deposited using electrophoresis. Indium Tin oxide (I TO) glass was used as an electrically conductive and transparent substrate. This paper focuses on optimized characteristics complimentary to a PProDOT-Me₂ based electrochromic thin film. Gels of vanadium oxide were created from V₂O₅ powder mixed with hydrogen peroxide (H₂O₂) and deionized water. Thin films were deposited onto a substrate submerged in the solution and subjected to cyclic voltammetry. Deposition parameters were varied and their effect on counter electrode characteristics investigated. The thin film exhibited a capacitance curve similar to the PProDOT-Me₂ based EC film while maintaining a transmittance greater than 60% indicating that V₂O₅ is a suitable material. The ensuing 1 inch x 1 inch smart window exhibits a change in transmittance of 60% and a lifetime of over 100,000 cycles at a switching speed of 1 second. Larger sized devices of six and twelve inches were successfully prepared and switched between the dark blue and transparent states in less than 15 seconds.

Citation Download Citation

Calen Kaneko, Chunye Xu, Lu Liu, Dai Ning, and Minoru Taya "Electro-deposited vanadium oxide as a counter-electrode for PProDOT-Me₂ based electrochromic devices (ECDs)", Proc. SPIE 5759, Smart Structures and Materials 2005: Electroactive Polymer Actuators and Devices (EAPAD), (6 May 2005); https://doi.org/10.1117/12.599911

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