Solar concentrator: One of the ways to “boost” the solar power is by using solar concentrator. By increasing the light intensity, the number of photogenerated carriers increases, resulting in increase in efficiency up to 15% [95]. The “concentrator systems” have begun to become cost-competitive as a result of the development of high efficiency GaAs cells. A typical concentrator system may use a light intensity of 6–400 times the sun, and increase the efficiency of a one sun GaAs cell from 31% to 35% at AM-1.5.