We demonstrate the feasibility approach to deploy two types of dual junction GaInP/Ge and
GaAs/Ge solar cells in a hybrid photovoltaic-solar thermal concentrator system, where they
can operate at 250 C and at medium light concentration. These devices were designed to
transfer absorbed heat to tube with a fluid, using high thermal conductivity of Ge substrate.
Both heterostructures showed no significant degradation after a high temperature thermal
storage of over 7 months long. Regarding their performance, the GaAs/Ge dual junction …