Patent ID: 6194245
Filing Date: 2001-02-27
Classification: H01L,Y02E,Y02P,Y10S

Abstract:
A method for making a solar cell comprising the steps of:providing a semi-conductor substrate having a surface;forming a porous structure adjacent the surface of the substrate including a first porous layer adjacent the surface having a first porosity, a second porous layer adjacent the first porous layer opposite the surface having a second porosity greater than said first porosity and a third porous layer in or adjacent to the second porous layer having a third porosity greater than said second porosity;forming an epitaxially grown film semi-conductor structure on the surface including at least one hetero junction;forming a SiO.sub.2 insulating layer on an exposed surface of the film semi-conductor structure;patterning and etching the insulating layer to define holes;depositing a metal film on the insulating layer to form a metal film layer;patterning and etching the metal film layer to form electrodes disposed in the holes;attaching elongated conductors having at least one extending end portion to the electrodes;attaching a support substrate to the surface overlying the electrodes and conductors with a binder material; andthereafter, separating the film semi-conductor structure and support substrate from the semi-conductor substrate along one of: a line of relative weakness defined in the third porous layer, at an interface defined between said third porous layer and the second porous layer, or adjacent an interface defined between said third porous layer and the second porous layer.