(WO9701189-A1)      The method involves providing a base material having an n-type doped emitter layer provided a grid-formed surface layer. In the top region of the base material is formed an n(++) doping layer over the entire surface. The emitter layer is then selectively etched, using a mask to form the surface texture.    Thus acutely tipped rib lines of oppositely intersecting type are formed, whose top section consists of the n(++) doped layer, while its lower part consists of the base material. Pref. the textured surface after etching is additionally n(+) doped over the entire surface.    ADVANTAGE -   Improvement of PERL solar cell with simple manufacture and increased efficiency. Minimum surface area not taking part in light conversion.    (DE19522539-C2)      The method involves providing a base material having an n-type doped emitter layer provided a grid-formed surface layer. In the top region of the base material is formed an n(++) doping layer over the entire surface. The emitter layer is then selectively etched, using a mask to form the surface texture.    Thus acutely tipped rib lines of oppositely intersecting type are formed, whose top section consists of the n(++) doped layer, while its lower part consists of the base material. Pref. the textured surface after etching is additionally n(+) doped over the entire surface.    ADVANTAGE -   Improvement of PERL solar cell with simple manufacture and increased efficiency. Minimum surface area not taking part in light conversion.    (EP834199-A1)      The method involves providing a base material having an n-type doped emitter layer provided a grid-formed surface layer. In the top region of the base material is formed an n(++) doping layer over the entire surface. The emitter layer is then selectively etched, using a mask to form the surface texture.    Thus acutely tipped rib lines of oppositely intersecting type are formed, whose top section consists of the n(++) doped layer, while its lower part consists of the base material. Pref. the textured surface after etching is additionally n(+) doped over the entire surface.    ADVANTAGE -   Improvement of PERL solar cell with simple manufacture and increased efficiency. Minimum surface area not taking part in light conversion.    (JP11508088-W)      The method involves providing a base material having an n-type doped emitter layer provided a grid-formed surface layer. In the top region of the base material is formed an n(++) doping layer over the entire surface. The emitter layer is then selectively etched, using a mask to form the surface texture.    Thus acutely tipped rib lines of oppositely intersecting type are formed, whose top section consists of the n(++) doped layer, while its lower part consists of the base material. Pref. the textured surface after etching is additionally n(+) doped over the entire surface.    ADVANTAGE -   Improvement of PERL solar cell with simple manufacture and increased efficiency. Minimum surface area not taking part in light conversion.    (US6147297-A)      The method involves providing a base material having an n-type doped emitter layer provided a grid-formed surface layer. In the top region of the base material is formed an n(++) doping layer over the entire surface. The emitter layer is then selectively etched, using a mask to form the surface texture.    Thus acutely tipped rib lines of oppositely intersecting type are formed, whose top section consists of the n(++) doped layer, while its lower part consists of the base material. Pref. the textured surface after etching is additionally n(+) doped over the entire surface.    ADVANTAGE -   Improvement of PERL solar cell with simple manufacture and increased efficiency. Minimum surface area not taking part in light conversion.