Phase change material switch and method of making the same
First Claim
Patent Images
1. A method for making a switch, the method comprising:
- forming an insulating layer over a substrate;
forming a resistive heater element over the insulating layer;
depositing a thermally conductive electrically insulating barrier layer over the heating element;
forming openings in the barrier layer aligned with ends of the resistive heater element;
forming a phase change material (PCM) element over the barrier layer spaced apart and proximate to the resistive heater element comprising;
forming a patterned photoresist over the barrier layer with an opening overlying and aligned with the resistive heater element;
depositing PCM to form the PCM element; and
removing the patterned photoresist and excess PCM by applying a chemical solvent lift-off material; and
forming conductive lines from ends of the PCM element and control lines from ends of the resistive heater element.
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Abstract
A phase change material (PCM) switch is disclosed that includes a resistive heater element, and a PCM element proximate the resistive heater element. A thermally conductive electrical insulating barrier layer positioned between the PCM heating element and the resistive heating element, and conductive lines extend from ends of the PCM element and control lines extend from ends of the resistive heater element.
107 Citations
23 Claims
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1. A method for making a switch, the method comprising:
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forming an insulating layer over a substrate; forming a resistive heater element over the insulating layer; depositing a thermally conductive electrically insulating barrier layer over the heating element; forming openings in the barrier layer aligned with ends of the resistive heater element; forming a phase change material (PCM) element over the barrier layer spaced apart and proximate to the resistive heater element comprising; forming a patterned photoresist over the barrier layer with an opening overlying and aligned with the resistive heater element; depositing PCM to form the PCM element; and removing the patterned photoresist and excess PCM by applying a chemical solvent lift-off material; and forming conductive lines from ends of the PCM element and control lines from ends of the resistive heater element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for making a phase change material (PCM) switch, the method comprising:
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forming an insulating layer over a substrate; forming a resistive heater element over the insulating layer; depositing a thermally conductive electrical insulating barrier layer over the resistive heating element; forming openings in the barrier layer aligned with ends of the resistive heater element; forming a patterned photoresist over the barrier layer with an opening overlying and aligned with the resistive heater device; sputtering PCM in its amorphous state to form a PCM element; removing the patterned photoresist and excess PCM by applying a chemical solvent lift-off material; performing an anneal process to change the PCM element from its amorphous state to its crystalline state to enhance its immunity to deleterious effects caused by further processing; and forming conductive lines from ends of the PCM element and control lines from ends of the resistive heater element. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of making a phase change material (PCM) switch, the method comprising:
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forming a resistive heater element; forming a PCM element proximate the resistive heater element; forming a thermally conductive electrical insulating barrier layer positioned between the PCM element and the resistive heating element; and forming conductive lines extending from ends of the PCM element and control lines extending from ends of the resistive heater element comprising; forming a patterned photoresist over the barrier layer and the PCM element with trenches extending from both ends of the PCM and trenches extending from both openings in the barrier layer aligned with ends of the resistive heater element; depositing a conductive material to form conductive lines extending from each end of the PCM element and control lines extending from each end of the resistive heater element; and removing the patterned photoresist and excess conductive material by applying a chemical solvent lift-off material. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification