Cu2ZnSnS4 Thin Film Solar Cells: Present Status and Future Prospects

Pollution of the earth and shortage of energy sources have been the bottle-neck of survival and development for human beings since the start of the 21st century. Therefore, lowering energy consumption and protecting the environment have gradually gained attention from countries all over the world. In order to keep sustainable development, governments, re‐ search institutes, and industries have been working on the problems caused by the shortage of available energy sources. It is well known that the best way is to exploit renewable energy resources. Solar energy is considered to be the most economic and effective among all avail‐ able renewable energy resources. Solar energy is inexhaustible and it has already been theo‐ retically and experimentally proved that the earth would not be polluted at all if solar energy was utilized effectively.