NOVELTY - The method involves forming upper, middle and lower solar subcells, and introducing a solar cell having a flexible film bonded into an etchant environment. A separation layer is etched while applying mechanical tension to a connecting link element to remove the flexible film with an epitaxial layer from a first single crystal substrate. The flexible film is attached to a surrogate substrate by an electrostatic technique. A contact metal layer (104) is lithographically processed to form grid lines (501). A cover glass (514) is attached over the grid lines. The surrogate substrate is removed.    USE - Method for manufacturing a solar cell i.e. inverted metamorphic multijunction solar cell, used in space application and terrestrial solar power application.    ADVANTAGE - The method enables producing a commercially viable and energy-efficient inverted metamorphic multijunction solar cell using commercially established fabrication processes. The method allows a back surface field (BSF) layer to drive minority carriers from a region near a base/BSF interface surface to minimize effect of recombination loss. The method enables absorbing photons representing absorbable radiation in bases of cells, which have narrower band gaps than emitters, thus improving short wavelength response for both subcells and effectively absorbing bulk of the radiation. The method allows surfactant assisted growth to result in a much smoother or planarized surface as surface topography influences bulk properties of a semiconductor material and as layer is thicker the use of surfactants minimizes threading dislocations in active regions, thus improving overall solar cell efficiency.    DETAILED DESCRIPTION - The flexible film is a polyimide film. The etchant environment is a liquid solution, hydrofluoric acid, or atmosphere containing an etchant aerosol.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a solar cell.    Contact metal layer (104)    Window layer (105)    Grid lines (501)    Adhesive (513)    Cover glass (514)