Electrochemical Deposition Method Utilizing Microdroplets of Solution
Any material that can be electroplated on a conductive substrate could be used. The process uses very low volume of plating solution, therefore reducing cost and waste. Deposits a thin film only where needed without mask, photolithography and etch steps. Film thickness and other film properties can be varied by changing the plating solution. Different films can be deposited on different sites, without masking. The method is readily automated via robotics.
The invention is a process of selectively depositing a thin film of material on a conductive substrate.It is especially useful for forming thin films on components of printed electronic microchips or circuits. A very small droplet (~400 nanoliters) of a conductive solution with the deposition material in it is placed on an electrically conductive component. A current is passed through the solution between a probe inserted in the droplet and another probe in electrical contact with the conductive substrate. Current between the two probes causes thin film deposition of the plating material on any surface that is both (a) in physical contact with the plating solution and (b) in electrical contact with the conductive substrate. This process reduces waste compared to standard electroplating techniques and eliminates the need for photolithography and etch steps to build these specific types of components. This in turn greatly decreases the cost, time and complexity of preparing these thin film components.
Patent Number: US7628902B2
Application Number: US2005169496A
Inventor: Knowlton, William B. | Russell, Dale D.
Priority Date: 28 Jun 2004
Priority Number: US7628902B2
Application Date: 28 Jun 2005
Publication Date: 8 Dec 2009
IPC Current: C25D000502 | C25D000508
US Class: 205136 | 205128 | 205133
Assignee Applicant: Boise State University,Boise
Title: Electrochemical deposition method utilizing microdroplets of solution
Usefulness: Electrochemical deposition method utilizing microdroplets of solution
Summary: The method is for selective electrochemical deposition on specific portions of a surface, e.g. printed circuit board.
Novelty: Selective electrochemical deposition on specific portions of surface, by placement of droplet of electrolytic solution on substrate, providing first probe in contact with droplet, but not substrate, and providing second probe
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