The solar cell is a device that converts solar light energy into electric energy. Depending on the type of material absorbing the light, it can be classified as being part of an Si family, a compound semiconductor family, and an organic family. Depending on the commercialization sequence, it can be classified into the 1st generation (crystal silicone), 2nd generation (silicone film, CIGS and CdTe film), 3rd generation (fuel response, organic), and next generation (quantum dot, plasmon).