Smoothed rear side doped layer for a bifacial solar cell

A method of creating a doped layer at a rear side (112) of a crystalline silicon bifacial solar cell is provided, including texturing at least a rear side (114) of a silicon substrate (110) of the solar cell to create a pattern of pyramids (120), thereby creating a pyramidal topology of the rear side; forming at the rear side by epitaxial growth at least one doped silicon epitaxial layer (130) on the pyramids, and, simultaneously with forming the doped layer and by using facet evolution, the pyramidal topology of the rear side is smoothed by the growth of the epitaxial layer, and wherein the epitaxial growth is continued until, on upper parts of a majority of the pyramids, an angle (132) between a surface (134) of the at least one epitaxial layer and the substrate is between 5 to 35°. A crystalline silicon bifacial solar cell is also provided.

Octrooi-publicatienummer: EP3671863

Jaar aanvraag: 2021

Jaar toekenning: 2021

Jaar van publicatie: 2021

Status: Toegewezen

Technologiedomeinen: Semiconductoren

Gevalideerd voor IOF-sleutel: Ja

Toegewezen aan: Associatie KULeuven