Manufacture of Multijunction Solar Cell Devices

The present invention relates to a method for manufacturing a multijunction solar cell device comprising the steps of providing a first substrate; providing a second substrate having a lower surface and an upper surface; forming at least one first solar cell layer on the first substrate to obtain a first wafer structure; forming at least one second solar cell layer on the upper surface of the second substrate to obtain a second wafer structure; bonding the first wafer structure to the second wafer structure wherein the at least one first solar cell layer is bonded to the lower surface of the second substrate and removing the first substrate