NOVELTY - Forming many solar cells from reusable substrate, comprises: forming first intermediate layer on substrate (200); forming first single crystal silicon layer (210) on first intermediate layer; processing (220) first single crystal silicon layer as first solar cell; selectively etching first intermediate layer to detach first single crystal silicon layer from substrate; forming second intermediate layer on substrate; forming second single crystal silicon layer on second intermediate layer; processing second single crystal silicon layer; and selectively etching second intermediate layer.    USE - The method is useful for forming solar cells from a reusable substrate (claimed), where the solar cells are useful for fabricating integrated circuit chips.    ADVANTAGE - The method utilizes the substrate, which can be reused (claimed) and refurbished, hence it is cost effective.    DETAILED DESCRIPTION - Forming many solar cells from a reusable substrate, comprises: forming a first intermediate layer on the substrate (200); forming a first single crystal silicon layer (210) on the first intermediate layer; processing (220) the first single crystal silicon layer as a first solar cell; selectively etching the first intermediate layer to detach the first single crystal silicon layer from the substrate; forming a second intermediate layer on the substrate; forming a second single crystal silicon layer on the second intermediate layer; processing the second single crystal silicon layer as a second solar cell; and selectively etching the second intermediate layer to detach the second single crystal silicon layer from the substrate. An INDEPENDENT CLAIM is also included for a semiconductor structure, comprising a single crystal silicon solar cell comprising a top surface with a pattern of etch openings.    DESCRIPTION OF DRAWING(S) - The figure shows a flow diagram of a process for forming solar cells from a reusable substrate.    Forming first intermediate layer on substrate (200)    Forming first single crystal silicon layer (210)    Processing first single crystal silicon layer as solar cell (220)    Forming openings (230)    Refurbishing substrate (260)