The recent progress in semiconductor heterostructure devices is reviewed. The field of electronic devices, while relying on rather mature concepts, is evidencing progress towards the intrinsic materials and structure performance. This is due to progress in technological manufacturing steps allowing device miniaturization and optimization. The field of optoelectronic devices relies on newer, more fundamental concepts modifications and witnesses the emergence of materials with unsurpassed performances. These are fundamentally based on low-dimensional physical concepts.