In 1816, Robert Stirling applied for a patent for his economizer that utilized solar thermal energy. A working concept model was used by Lord Kelvin in his university lectures, and the same type of engine would later be used in what is called a Stirling system, a device that actually produced electricity from the sun’s energy.
The photoelectric effect, which is the basis of most photovoltaic cells today, was discovered by Heinrich Hertz in 1887.
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