Patent ID: 9708183
Date: 2017-07-18
CPC Classifications: B41J,B81B,B81C

Claim:
1. A process for filling one or more etched holes defined in a surface of a wafer substrate, said process comprising the steps of: (i) depositing a layer of a thermoplastic first polymer onto the surface and into each hole; (ii) reflowing the first polymer; (iii) exposing the wafer substrate to a controlled oxidative plasma so as to reveal the surface; (iv) optionally repeating steps (i) to (iii); (v) depositing a layer of a photoimageable second polymer so as to overfill each hole with said second polymer; (vi) selectively removing the second polymer from regions outside a periphery of the holes to provide overfilled holes, the selective removing comprising exposure and development of the second polymer; and (vii) planarizing the surface to provide one or more holes filled with a plug comprising the first and second polymers, each plug having a respective upper surface coplanar with the surface of the wafer substrate, wherein the first and second polymers are different.