Patent ID: 8772630
Filing Date: 2014-07-08
Classification: H01L,Y02E,Y02P

Abstract:
1. A solar cell comprising: a substrate containing impurities of a first conductive type, the substrate having a textured surface including a plurality of jagged portions; an emitter layer covering the textured surface, the emitter layer containing impurities of a second conductive type, wherein the conductivity of the second type is opposite the conductivity of the first conductive type, and wherein the emitter layer has a textured surface, over the textured surface of the substrate, including a plurality of jagged portions that generally align with the plurality of jagged portions of the substrate; a first electrode electrically connected to the emitter layer; a second electrode electrically connected to the substrate, wherein a concentration of the impurities of the second conductive type within the emitter layer is greatest in a proximity to a peak of each jagged portion, such that a sheet resistance near the peak of each jagged portion is less than that of a remaining portion of each jagged portion, wherein the first electrode comprises a plurality of first metal particles and a plurality of second metal particles, and each of the plurality of first metal particles is a recrystallized particle of second metal particles, wherein a diameter of all the plurality of first metal particles is greater than a peak-to-peak distance between adjacent jagged portions of the emitter layer, wherein a diameter of all the plurality of second metal particles is greater than the diameter of each of the plurality of first metal particles, wherein first metal particles, and not second metal particles, are in contact with the plurality of jagged portions of the emitter layer, wherein the diameter of each of the plurality of second metal particles is about 2 μm to about 5 μm.