[16p-304-1~13] Photovoltaic 4.0 - Next-generation renewable energy systems powered by high-efficiency, low-cost photovoltaics -

▲ [16p-304-1] Extended detailed-balance analysis and light management in high-efficiency solar cells

〇Hidefumi Akiyama¹ (1.ISSP, Univ. of Tokyo)

Keywords:solar cell, detailed balance, multi-junction

We developed an extended detailed-balance-theory analysis of multi-junction solar cells, which enables us to calculate upper-limit efficiencies and optimized band-gap designs of single- and multi-junction solar cells with active materials of realistic quality. The theory includes light management not only for incoming sun light, but also for outgoing luminescence light, such as photon recycling and luminescence coupling. The theory is useful not only for theoretical predictions and designs, but also for analysis of experimental data. We experimentally characterized external and radiative efficiency and derived contribution of luminescence coupling and photon recycling by analyzing data of absolute electro-luminescence intensity.