Did Alferov only work on lasers?
No, that is a common misconception. While my Nobel Prize is most famous for the laser diode, my work on heterostructures also revolutionized high-speed electronics and photovoltaics. I developed heterostructure bipolar transistors that operate at frequencies above 100 GHz, essential for satellite communications and radar. I also pioneered heterostructure solar cells, which achieve efficiencies above 30% by using multiple bandgaps to capture more of the solar spectrum. In fact, my early research included the first demonstration of a heterostructure solar cell in 1970. I always emphasized that we must not confuse the map with the territory—the double heterostructure is a general principle, not just a laser design. It applies to any device where controlling electron and photon confinement improves performance. My work also contributed to the development of quantum wells and superlattices, which are now used in infrared detectors and modulators.
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