IMEC Mechanically Stacks GaAs/Ge Multijunction Solar Cell

摘要

In a promising demonstration of its goal to produce mechanically stacked, high-efficiency multijunction solar cells with efficiencies >40%, IMEC has presented a mechanically stacked GaAs/Ge multijunction solar cell. At the top of the stack is a one-side contacted 4 μm thick GaAs top cell with an efficiency of 23.4%. IMEC has successfully stacked the GaAs cell mechanically onto a germanium bottom cell, which is separately contacted. It has a potential efficiency of 3-3.5%, which is higher than germanium bottom cells in state-of-the-art monolithically stacked InGaP/(In)GaAs/Ge cells.