Patent ID: 8097803

Claim:
A solar energy system, comprising: a reflecting unit, having a photovoltaic cell with a first energy band gap and a reflecting surface for reflecting or focusing sunlight, wherein the photovoltaic cell with the first energy band gap is used to convert the sunlight with a wavelength shorter than or equal to x nm into electric energy; a heat absorber, suitable to convert the sunlight reflected by the reflecting unit and having a wavelength longer than or equal to y nm into thermal energy, wherein the heat absorber has a first surface, a liquid and a second surface, the liquid is located between the first surface and the second surface, the first surface faces the reflecting surface, and the second surface faces away from the reflecting surface; and a first solar panel, having a photovoltaic cell with a second energy band gap, wherein the photovoltaic cell with the second energy band gap is used to convert the sunlight penetrating the heat absorber and having a wavelength shorter than or equal to z nm into electric energy, wherein the first energy band gap is greater than the second energy band gap, and y≧z and z>x.