Abstract:
Verfahren zur lokalen Entfernung einer Oberflächenschicht (36), die auf einer Textur (30) eines texturierten Substrats aufgebracht ist, wobei die Textur (30) eine Vielzahl von Strukturelementen (32) mit Strukturspitzen (34) und/oder Strukturkanten aufweist, aufweisend die Schritte des lokalen Bestrahlungs der Textur (30) durch die Oberflächenschicht (36) hindurch mittels einer die Oberflächenschicht (36) zumindest partiell durchdringenden und von der Textur (30) zumindest partiell absorbierten Laserstrahlung, deren Intensität so eingestellt ist, dass die Textur (30) mittels der Laserstrahlung lokal angeschmolzen und nachfolgend rekristallisiert wird (16), wobei die Oberflächenschicht (36) im Bereich der Strukturspitzen (34) und/oder der Strukturkanten lokal so geöffnet wird, dass die Öffnungen nach der lokalen Bestrahlung der Textur (30) um die Strukturspitzen (34) und/oder die Strukturkanten herum von zusammenhängenden nicht geöffneten Bereichen der Oberflächenschicht (36) vollständig umgeben sind, und des Entfernens (18) der rekristallisierten Bereiche (38) der Textur (30) in einem Ätzschritt mittels eines Ätzmediums, wobei die Oberflächenschicht (36) abseits der rekristallisierten Bereiche (38) als Ätzmaskierung gegenüber dem Ätzmedium verwendet wird, sowie Solarzelle (70).
Abstract:
Method for manufacturing a solar cell with a two-stage doping (88, 89) including the following method steps of forming (14, 48) an oxide layer (82), which can be penetrated by a first dopant, on at least one part of the surface of a solar cell substrate (80), of forming (16; 50) an opening in the oxide layer (82) in at least one high-doping region (88) by removing (16; 50) the oxide layer (82) in this high-doping region (88), of diffusing (28) the first dopant into the at least one high- doping region (88) of the solar cell substrate (80) through the opening and of diffusing (28) the first dopant into the solar cell substrate (80) through the oxide layer (82), wherein the diffusing-in (28) through the openings and through the oxide layer (82) takes place at the same time in a common diffusion step and the solar cell substrate (80) is diffused (28) in the common diffusion step (28) in an at least partially hydrophilic state.
Abstract:
Method for manufacturing a solar cell with a two-stage doping (88, 89) including the following method steps of forming (14, 48) an oxide layer (82), which can be penetrated by a first dopant, on at least one part of the surface of a solar cell substrate (80), of forming (16; 50) an opening in the oxide layer (82) in at least one high-doping region (88) by removing (16; 50) the oxide layer (82) in this high-doping region (88), of diffusing (28) the first dopant into the at least one high- doping region (88) of the solar cell substrate (80) through the opening and of diffusing (28) the first dopant into the solar cell substrate (80) through the oxide layer (82), wherein the diffusing-in (28) through the openings and through the oxide layer (82) takes place at the same time in a common diffusion step and the solar cell substrate (80) is diffused (28) in the common diffusion step (28) in an at least partially hydrophilic state.
Abstract:
The invention relates to a method for locally removing a surface layer (36) which is applied to a texture (30) of a textured substrate, wherein the texture (30) has a multiplicity of structure elements (32) with structure tips (34) and/or structure edges, having the steps of locally irradiating the texture (30) through the surface layer (36) by means of laser radiation which at least partially penetrates through the surface layer (36) and which is at least partially absorbed by the texture (30), the intensity of which laser radiation is set such that the texture (30) is locally melted by means of the laser radiation and subsequently recrystallized (16), wherein the surface layer (36) is locally opened in the region of the structure tips (34) and/or of the structure edges such that the openings around the structure tips (34) and/or the structure edges after the local irradiation of the texture (30) are completely surrounded by continuous, non-open regions of the surface layer (36), and removing (18) the recrystallized regions (38) of the texture (30) in an etching step by means of an etching medium, wherein the surface layer (36) outside the recrystallized regions (38) is used as an etching mask against the etching medium, and to a solar cell (70).