NOVELTY - The solar cell has a window layer (40), a subcell (50) and a thin film backing layer (70) under tensile stress. The subcell is located between the window layer and the thin film backing layer. The subcell is comprised of an indium gallium arsenide (InGaAs) base layer, an InP base layer indium gallium arsenide phosphide (InGaAsP) base layer, indium aliminum arsenide (InAlAs) base layer and indium aluminum gallium arsenide (InAlGaAs) base layer. The base material of the subcell is indium aliminum arsenide antimony (InAlAsSb).    USE - Thin film indium phosphide (InP)-based solar cell such as single-jnnction InP-based solar cell, epitaxial lift-off (ELO) single-junction InP-based solar cell, dual-junction InP-based solar cell, ELO dual-junction InP-based solar cell, triple-junction InP-based solar cell, ELO triple-junction InP-based solar cell, ELO multi -junction In-P based solar cell, metamorphic ELO multi -jnnction In-P based solar cell, thin film ELO single-junction InGaAs solar cell, thin film ELO single-junction InP solar cell, non-ELO 1.0 eV single-junction InGaAsP solar cell, non-ELO 1.2 e V single-junction InGaAsP solar cell, non-ELO 1.2 eV single-junction InGaAsP solar cell, non-ELO dual-junction InP/InGaAs solar cell, dual-junction InP/InGaAs solar cell, ELO triple-junction InAlAsSb/InGaAsP/InGaAs solar cell, split top cell ELO triple-junction InAlAs/InAlAs/InGaAsP/InGaAs solar cell and MM ELO InP solar cell used for satellite solar panel, portable blanket and used to power for unmanned aerial vehicle.    ADVANTAGE - The efficiency and performance of the cell are improved. The cell flexibility is improved. The weight is reduced. The solar cells are provided with improved resistance to radiation. The cost of the cell is reduced.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for solar cell stack.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the solar cell.    Release layer (20)    Window layer (40)    Subcell (50)    Back contact layer (60)    Thin film backing layer (70)