Patent ID: 11894472
Assignee: MAXEON SOLAR PTE. LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 18:
19. A solar cell, comprising:
a substrate having a back surface and an opposing light-receiving surface;
a plurality of N-type and P-type semiconductor regions disposed in or above the back surface of the substrate;
a conductive contact structure disposed over the plurality of N-type and P-type semiconductor regions, the conductive contact structure comprising metal foil portions in alignment with corresponding ones of the N-type and P-type semiconductor regions, wherein one or more of the metal foil portions extends laterally beyond the substrate; and
a patterned wet etchant-resistant polymer layer disposed on the conductive contact structure, the patterned wet etchant-resistant polymer layer disposed on and in alignment with the metal foil portions, and the patterned wet etchant-resistant polymer layer coating a top, a bottom and ends of each of the one or more of the metal foil portions that extends laterally beyond the substrate.