Patent ID: 9112071
Filing Date: 2015-08-18
Classification: H01L,Y02E,Y02P

Abstract:
1. A method of manufacturing a solar cell comprising the steps of: Providing a silicon substrate with a first and a second side, which first side is intended as main side for capturing incident light; Providing a first via hole into the substrate, which via hole extends from the first to the second side or towards the second side without extension thereto, which first via hole is provided with a tapered shape, such that the first via hole has a first diameter at the first side and a second diameter at or near the second side respectively, wherein the first diameter is larger than the second diameter, Applying a dopant of a first conductivity type in a diffusion process to provide a first doped region, the first doped region is defined on the first side and at a first surface in the first via hole; Applying a dopant of a second conductivity type opposed to the first conductivity type to provide a second doped region at the second side of the substrate; Providing a passivation layer onto at least one side of the substrate; Applying conductor material at parts of the first side and the second side of the substrate and into the first via hole to form a via through the substrate to define a first conductor, wherein: the second doped region is a back surface field (BSF) that extends up to the via without any substantial intermediate emitter-BSF isolation area at the second side of the substrate; the first surface extends to the first side and is spaced apart from the second side of the substrate through a second surface in the first via hole, which second surface defines an isolation area between the first doped region and the second doped region; the passivation layer is provided onto the first and the second side of substrate and onto at least one surface of the first via hole, the first conductor provides a connection from the first doped region acting as an emitter on the first side to contacts on the second side.