As the pressure increasing from the global warming and soaring oil price, the energy issue has been the center of attraction for science and technology. How to participate in the development of this impending issue is important for every segment of science and technology. In this report, a viewpoint of physical chemist is discussed for chemists to contribute their efforts in green energy using the manufacture of silicon substrate for polycrystalline silicon solar cell as an example. The polycrystalline silicon solar cell.