Methods of underfilling and encapsulating semiconductor assemblies with materials having selected properties using stereolithography

Abstract: Methods of forming semiconductor packages include immersing a semiconductor device assembly in a liquid photopolymerizable resin including a plurality of discrete particles dispersed therethrough, and selectively at least partially curing portions of the resin adjacent at least one semiconductor die of the semiconductor device assembly. In some embodiments, the semiconductor device assembly may be immersed in a second liquid photopolymerizable resin having at least one physical property differing from the first liquid photopolymerizable resin, and the second liquid photopolymerizable resin may be selectively at least partially cured. Furthermore, the semiconductor die may have an active surface including an array of optically interactive semiconductor devices, and portions of the liquid photopolymerizable resin surrounding a periphery of the array may be selectively at least partially cured to form a substantially opaque support structure. (end of abstract)