20. Bill Yerkes
1980 — Bill Yerkes founded ARCO Solar, which becomes the first company to produce more than 1 MW of photovoltaic modules in one year.
21. Alvin Marks
1988 — Dr. Alvin Marks received patents for two solar power technologies he developed: Lepcon and Lumeloid. Lepcon consists of glass panels covered with a vast array of millions of aluminum or copper strips, each less than a micron or thousandth of a millimeter wide. As sunlight hits the metal strips, the energy in the light is transferred to electrons in the metal, which escape at one end in the form of electricity. Lumeloid uses a similar approach but substitutes cheaper, film-like sheets of plastic for the glass panels and covers the plastic with conductive polymers, long chains of molecular plastic units.