Effects of Heat Treatment on Bonding Properties in InP-to-Si Direct Wafer Bonding

Effects of heat treatment on bonding properties, which include bonding strength, photoluminescence intensity, and electrical conduction through the interface, have been investigated in InP-to-Si direct wafer bonding for the first time. Bonding strength and electrical conduction were found to be improved by heat treatment. On the other hand, a degradation of photoluminescence intensity was observed with high-temperature treatment.