Patent ID: 8633374
Filing Date: 2014-01-21
Classification: H01L,Y02E,Y02P

Abstract:
1. A photovoltaic cell comprising: a semiconductor lamina lightly doped to a first conductivity type, the lamina having a first surface and a second surface opposite the first surface and a thickness of the lamina between the first surface and the second surface is between about 0.2 microns and about 10 microns, wherein the lamina includes a plurality of discrete heavily doped contact regions, wherein each heavily doped contact region is doped to the first conductivity type and above a first dopant concentration, and extends contiguously through the lamina from the first surface to the second surface, wherein the lamina comprises at least a portion of a base of the photovoltaic cell, wherein the lamina further comprises a heavily doped junction region doped to a second conductivity type opposite the first, wherein the heavily doped junction region is at the first surface and only the first surface, and wherein a first electrical contact is positioned on the first surface and electrically connected to the heavily doped junction region doped to a second conductivity type and a second electrical contact is positioned on the second surface and electrically connected to the heavily doped contact regions doped to a first conductivity type.