Patent ID: 8703521

Claim:
A method for fabrication of a multijunction photovoltaic (PV) cell, the method comprising: providing a stack comprising a plurality of junctions on a substrate, each of the plurality of junctions having a respective bandgap, wherein the plurality of junctions are ordered from the junction having the smallest bandgap being located on the substrate to the junction having the largest bandgap being located on top of the stack; forming a top metal layer, the top metal layer having a tensile stress, on top of the junction having the largest bandgap; adhering a top flexible substrate to the metal layer; forming a semiconductor layer located on the junction having the smallest bandgap by spalling the semiconductor layer from the substrate at a fracture in the substrate, wherein the fracture is formed in response to the tensile stress in the top metal layer; forming a bottom metal layer on the semiconductor layer.