Building Integrated photovoltaic (BIPV) is an important application scenario of thin film solar cells. As an effective means to improve the efficiency of thin film solar cells, the design of micro-lens structure should match its application scenario to maximize power generation efficiency. In this paper, an optimal design method for the structure of micro-lens used in BIPV is proposed. BIPV lighting roof application scenario is taken as an example. The light trapping performance of different micro-lens structures, under solar illumination during the summer solstice, is analyzed through using Tracepro software. The results show that the V-groove micro-lens has the best light trapping performance when the vertex angle is 110° and the groove depth is 300μm. Compared with non-micro-lens scenario, the irradiance flux on the incident surface of the amorphous silicon can be increased by 16.28%.
Keywords building integrated photovoltaic, micro-lens structure light trapping, thin film solar cell, optimal design