Intermediate band solar cells

Intermediate band solar cell theoretically offer a promising way to significantly increase cell efficiency compared to a single-junction solar cell. Although the original concept of intermediate band solar cells was proposed in 1997, no considerable progress has been done especially in MOVPE technology. In the frame of this project I would like to prepare intermediate solar cell devices by MOVPE technology on GaAs substrates. Intermediate band will be created by several types of quantum dot structures with emphasis on structures with type II band alignment. Type II QD properties such as the charge separation and related long radiative life time improves charge extraction in these structures and makes them very suitable for solar cell applications. To increase light absorption I propose new type II vertically aligned QD structures combing in one stack QDs from different materials. The structural properties of the whole solar cells will be tuned to increase its efficiency.