Advancing solar cells to the limit with energy cascading

An analysis of six-junction (6J) concentrated photovoltaic (CPV) solar cells and modules versus combined cycle power plants is presented in order to determine if the power conversion efficiency of 6J CPV modules can equal or exceed the power conversion efficiency of combined gas turbine/steam turbine power plants. The 6J CPV solar cells are modeled with a realistic DNI solar spectrum at Phoenix, AZ, USA and then CPV cell efficiency and module system efficiency is calculated. Six junction CPV cells and modules will have to be pushed close to their limits in order to approach the performance of combined cycle power plants. If this is the case, it may be possible to realize ~ 50% CPV module AC efficiency with advanced 6J CPV cells and optimized balance of systems.