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Electrochemical, RuO(2)-Based Light Switch

IP.com Disclosure Number: IPCOM000052660D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Cuomo, JJ: AUTHOR [+3]

Abstract

A light-based switch based on plating-deplating cycles is described using a RuO(2) film on glass which is in contact with an electrochromic liquid. Transparent or semitransparent metal electrodes made of tin oxide and indium oxide films deposited on glass have been known for a long time. It is also possible to fabricate such conductive films made of noble metals, such as Au or Pt. But none of these materials can be used reliably as an internal electrode in an electrochemical cell due to anodic dissolution and corrosion.

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Electrochemical, RuO(2)-Based Light Switch

A light-based switch based on plating-deplating cycles is described using a RuO(2) film on glass which is in contact with an electrochromic liquid. Transparent or semitransparent metal electrodes made of tin oxide and indium oxide films deposited on glass have been known for a long time. It is also possible to fabricate such conductive films made of noble metals, such as Au or Pt. But none of these materials can be used reliably as an internal electrode in an electrochemical cell due to anodic dissolution and corrosion.

Here, a RuO(2) film is used on glass or other surfaces, is electro-chemicall conductive as a noble metal, and does not corrode by anodic dissolution. A light beam A is incident on the surface of a cell 10, shown in the drawing, and in one condition the surface is transparent, the beam A goes through and is detected as A" on the other side. In the opposite condition, the surface is very quickly (Musec.) made opaque and the beam is reflected and detected in B. The device can, therefore, be used for light modulation and for display applications. It can also serve as a memory cell depending on the condition A or B of an element 12, of which there can be many arranged in the same cell 10.

The cell is an electrochemical cell with the element 12 constituting a transparent conductive RuO(2) thin film electrode. The cell contains also a counter electrode which can assume a number of configurations, and the electro...