Patent ID: 9537021
Date: 2017-01-03
CPC Classifications: H01L,Y02E

Claim:
1. A photovoltaic cell, comprising: a semiconductor stack comprising an upper surface and a lower surface opposite to the upper surface; and an upper electrode comprising a plurality of grid electrodes formed on the semiconductor stack and comprising first group grid electrodes and second group grid electrodes, wherein the first group grid electrodes are closer to a center of the upper surface than the second group grid electrodes are to the center of the upper surface, and the second group grid electrodes surround the first group grid electrodes, wherein the first group grid electrodes comprise a pitch smaller than that of the second group grid electrodes, or each of the first group grid electrodes comprises a uniform width smaller than that of each of the second group grid electrodes, wherein the upper electrode comprises a plurality of collector electrodes and the plurality of grid electrodes is formed between the plurality of collector electrodes; wherein the plurality of collector electrodes and the plurality of grid electrodes are perpendicular to each other, and the grid electrodes are parallel to each other.