Progress toward an advanced four‐subcell inverted metamorphic multi‐junction (IMM) solar cell

We report progress on the development of an advanced four-subcell IMM CPV solar cell that is designed for extremely high conversion efficiency under realistic concentrator operating conditions. Practical considerations allowing the design to mitigate problems related to Al-containing alloys, lattice mismatch, non-ideal short-wavelength response, and reflection losses are described. Performance modeling is used to guide the choice of optimal subcell band gaps for the new IMM cell. Early experimental efforts to develop and implement the new design are described and discussed. Copyright (C) 2015 John Wiley&Sons, Ltd.