Optical absorption enhancement in vertical InP nanowire random structures for photovoltaic applications

摘要

We have investigated the numerical method on optical properties of vertical InP nanowires with three types of random structures, i.e. random diameter, height, and position. It is found that light absorption in random structures is improved compared to their periodic structures. Also, enhancement of absorption in random position structure is slight while random diameter shows significant absorption enhancement, which achieves 10.4% improvement compared to the periodic structure. This is due to additional resonances, broadening of existing resonance, and lower optical reflection.