 A receiver consists of three basic parts; an antenna that converts the radio waves (light) into wave-like motions of electrons in the antenna material, an electronic valve that traps the electrons as they pop off the end of the antenna, and a tuner that amplifies electrons of a selected frequency.It is possible to build a solar cell identical to a radio, a system known as an optical rectenna, but to date these have not been practical.The majority of the solar electric market is made up of silicon-based devices.