Patent ID: 7851249

Claim:
A method for making a tandem solar cell comprising the steps of: providing a ceramic substrate; providing a titanium-based layer on the ceramic substrate; providing an n + -p − -p + laminate on the titanium-based layer by the steps of: using an atmospheric pressure chemical vapor deposition device to depose dichlorosilane and diborane on the titanium-based layer, thus causing the epitaxial growth of a p + -type back surface field layer on the titanium-based layer; raising the temperature, thus causing the epitaxial growth of a p − -type light-soaking layer on the p + -type back surface field layer; and conducting n + -type diffusive deposition of phosphine on the p − -type light-soaking layer, thus forming an n + -type emitter on the p − -type light-soaking layer; using a plasma-enhanced chemical vapor deposition device to provide SiCNO:Ar plasma to passivate the n + -p − -p + laminate by filling the dangling bonds of the silicon atoms on the surface of the n + -type emitter and on the crystalline boundaries of the p + -type back surface field layer and the p − -type light-soaking layer; providing an n-i-p laminate on the n + -p − -p + laminate by the steps of: using a chemical vapor deposition device to depose dichlorosilane and diborane on the n + -type emitter, thus forming a p-type amorphous silicon carbide layer on the n + -type emitter; conducting inter-doping with non-reactive gas to form an i-type amorphous silicon carbide intrinsic layer on the p-type amorphous silicon carbide layer; and conducting n-type diffusive deposition of phosphine on the i-type amorphous silicon carbide intrinsic layer to form an n-type amorphous silicon carbide layer on the i-type amorphous silicon carbide intrinsic layer; using potassium hydroxide solution and a patterned mask to etch a portion of the n-i-p laminate and providing a p-type ohmic contact; using a patterned mask to provide a Ti/Pd/Ag layer on the n-type amorphous silicon carbide layer and annealing the Ti/Pd/Ag layer in argon, thus forming an n-type ohmic contact; and using a patterned mask to provide an anti-reflection layer of SiCN/SiO 2 on the n-type amorphous silicon carbide layer.