Russell Ohl is generally recognized for patenting the modern solar cell (US2402662, "Light sensitive device"). Ohl was a notable semiconductor researcher prior to the invention of the transistor. Russell Ohl’s specialized area of research was into the behavior of certain types of crystals. He worked on materials research in the 1930’s at AT&T's Bell Labs’ Holmdel facility, investigating diode detectors suitable for high-frequency wireless, broadcasting, … Wikipedia
The definitive Wikipedia entry for Russell Ohl. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Russell_Ohl