Abstract
We investigated the effect of polarization of III-nitrides upon the energy band structures and the circuit voltage (VOC) in nitride solar cells. We found that the strong spontaneous polarization will adversely reduce the open circuit voltage (VOC) in p-i-n nitride solar cells. On the contrary, the piezoelectric polarization in InGaN/GaN MQW solar cells does not play a significant role in reducing the open circuit voltage. As an alternative to p-i-n nitride solar cells, based on theoretical energy band structures we propose hybrid InGaN/ZnO solar cells which do not have an adverse influence on the reduction of the VOC. We fabricated hybrid p-GaN/n-ZnO solar cells and demonstrated for the first time the photovoltaic effects.
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