Sacrificial Anode Electrochemical Separation of Multilayer Electronic Stacks
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Solution Overview
Problem
Current methods for separating electronic components from substrates, such as etching, are inefficient due to lack of desired etch selectivity and slow separation rates, necessitating improved techniques for multilayer stack separation.
Innovation Solution
The method involves forming an electrochemical cell with a sacrificial anode between the electronic assembly and substrate, generating a potential difference to electrochemically oxidize and dissolve the anode, allowing for efficient separation of the electronic assembly from the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If etching operations are used to separate devices from substrate, then separation can be achieved, but the process is slow and requires high etch selectivity that is difficult to fabricate
Solution Approach 1:
The patent extracts the separation function from the etching process by introducing a sacrificial anode layer that can be selectively dissolved through electrochemical oxidation. This separates the attachment function (performed by the sacrificial layer) from the device layers, enabling rapid removal without requiring etch selectivity between device components and substrate.
Solution Approach 2:
The sacrificial anode layer acts as an intermediary between the electronic assembly and substrate. It provides a dedicated separation interface that can be removed through electrochemical oxidation, eliminating the need for selective etching of the device layers themselves and enabling faster separation.
2Productivity
If highly corrosive chemical solutions are used for etching, then separation can be achieved, but the process time increases significantly
Solution Approach 1:
The patent replaces the chemical etching mechanism with an electrochemical oxidation process. By applying electrical potential to dissolve the sacrificial anode, the process achieves faster separation rates while using less corrosive solutions, substituting electrical energy for chemical reactivity.
Solution Approach 2:
The patent changes the separation mechanism from chemical etching to electrochemical oxidation. This parameter change enables control over separation rate through electrical potential while using milder chemical environments, simultaneously improving productivity and reducing harmful chemical exposure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables rapid and selective separation of electronic components without damaging the device, allowing for the reuse of substrates and improved operational efficiency of devices like photovoltaic cells.
Implementation Method 1
separating the electronic assembly from the substrate by electrochemically oxidizing the sacrificial anode portion to dissolve the sacrificial anode portion within the electrically conductive solution
Implementation Method 2
locating the multilayer stack within an electrically conductive fluid to form an electrochemical cell
Data Source
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AI summary
Systems and methods for separating components of a multilayer stack of electronic components. The multilayer stack includes an electronic assembly, a substrate, and a sacrificial anode portion that is located between the electronic assembly and the substrate and that operatively attaches the electronic assembly to the substrate. The systems and methods may include locating the multilayer stack within an electrically conductive fluid to form an electrochemical cell. The systems and methods further may include generating a potential difference between a cathode portion of the electronic assembly and the sacrificial anode portion such that the cathode portion forms a cathode of the electrochemical cell and the sacrificial anode portion forms an anode of the electrochemical cell. The systems and methods additionally may include separating the electronic assembly from the substrate by electrochemically oxidizing the sacrificial anode portion to dissolve the sacrificial anode portion within the electrically conductive solution.