Hybrid circuit structure and partial backfill method for improving thermal cycling reliability of same

摘要

A method of improving thermal cycling reliability for a hybrid circuit structure requires providing at least two circuit layers, aligning two of the circuit layers vertically such that their respective circuit elements have a precise and well-defined spatial relationship, and providing an adhesive material which wicks into a portion of the space between the aligned layers so as to mitigate damage to the structure and/or interconnections that might otherwise occur due to thermal contraction mismatch between the layers. The adhesive material is required to have an associated viscosity such that, when provided under predetermined conditions, the adhesive stops wicking before reaching, and possibly degrading the performance of, the circuit elements.