Trailblazers in Solid-State Electronics [Historical] ABSTRACT:The first person to investigate solid-state effects was the German physicist Karl Ferdinand Braun. It is little known that the first solid-state devices were made much earlier, even before thermionic tubes were conceived. The selenium rectifier was the first solid-state metal diode suitable for more general power uses. Did you like this research project? To get this research project Guidelines, Training and Code... Click Here facebook twitter google+ linkedin stumble pinterest The Next Generation of IES [Message from the President] Ore-Grinding Cycloconverter Drive Operation and Fault: My Experience with an Australian Grid