Patent ID: 8815671
Filing Date: 2014-08-26
Classification: H01L

Abstract:
1. A method of creating differential stress in a plurality of contacts in an integrated circuit (IC) chip, the method comprising: providing a substrate including a p-type field effect transistor (PFET) and an n-type field effect transistor (NFET); etching at least one PFET contact trench to the PFET; depositing a first material at a first temperature in the at least one PFET contact trench to form a PFET metal contact within the PFET contact trench; etching at least one NFET contact trench to the NFET; and depositing a second material at a second temperature in the at least one NFET contact trench to form an NFET metal contact within the NFET contact trench, wherein the first temperature of the first material forming the PFET metal contact is higher than the second temperature of the second material forming the NFET metal contact.