Method of forming a dielectric layer on a semiconductor device
First Claim
1. A method of forming a substantially planar layer of an electrically insulating material over electrical interconnect topography on a semiconductor device, said method comprising the steps of:
- (a) reacting phosphoric acid and a trivalent metallic halide compound with an aliphatic solvent to form a coating fluid;
(b) spinning said coating fluid onto a surface of said semiconductor device to form a layer over said interconnect topography; and
(c) heating at least said layer to at least a first predetermined temperature for at least a first predetermined period of time.
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Abstract
A method for forming a substantially planar inorganic dielectric layer over a predetermined pattern of electrical interconnects comprises the steps of reacting phosphoric acid and a trivalent metallic halide compound with an aliphatic solvent to form a coating fluid. The coating fluid is then spun onto the semiconductor device to form a layer over the electrical interconnect. The resultant device is then baked at a first temperature to drive off the solvent and then baked at a second, higher temperature, in order to promote the glass forming reaction. This process is repeated as required to form a coating layer having a thickness which exhibits levelling characteristics of such high quality that fine topography can be carried out on succeeding layers of metal in order to form additional interconnect layers with precision.
16 Citations
18 Claims
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1. A method of forming a substantially planar layer of an electrically insulating material over electrical interconnect topography on a semiconductor device, said method comprising the steps of:
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(a) reacting phosphoric acid and a trivalent metallic halide compound with an aliphatic solvent to form a coating fluid; (b) spinning said coating fluid onto a surface of said semiconductor device to form a layer over said interconnect topography; and (c) heating at least said layer to at least a first predetermined temperature for at least a first predetermined period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification