III-nitride compound semiconductors for solar cell

Solar cells are one of the best alternatives compared to our conventional or fossil energy and, thus, can play an important role in energy economy in an environment friendly fashion in the coming years. The main barrier of this technology is its low efficiency. Though the maximum theoretical efficiency of a solar cell teaches up to 86% but the practical situation is still far behind. We have discussed the main limitations of solar cell and the barriers for the efficiency of a solar cell and the perhaps the solution by using III-V compound semiconductors and their alloys. An up-to-date chronology for the efficiency has been discussed. Special attention has been given on III-Nitrides (e.g., InN) as a competitive candidate for the growth of solar cell.