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Optoelectronics is a branch of technology that deals with the interaction between light and electronic devices. It encompasses the generation, detection, and control of light using semiconductor materials. Kroemer's research on semiconductor heterostructures, which involve the layering of different semiconductor materials, has been instrumental in the development of optoelectronic devices such as lasers, LEDs, and solar cells. These devices have revolutionized various fields including telecommunications, displays, and renewable energy.