High efficiency solar panel
One embodiment of the present invention provides a solar panel. The solar panel includes a plurality of subsets of solar cells. The solar cells in a subset are coupled in series, and the subsets of solar cells are coupled in parallel. The number of solar cells in a respective subset is sufficiently large such that the output voltage of the solar panel is substantially the same as an output voltage of a conventional solar panel with all of its substantially square shaped solar cells coupled in series.
1. A solar panel, comprising:
a plurality of solar cell strips arranged into m subsets, wherein m is an integer greater than one;
wherein a respective solar cell strip has a rectangular shape with a long edge and a short edge, and wherein a length of the long edge is substantially m times that of the short edge,
wherein solar cell strips in a respective subset are electrically coupled in series; and
wherein the m subsets of solar cell strips are electrically coupled in parallel.
2. The solar panel of claim 1 , wherein the solar cell strip is obtained by dividing a substantially square shaped solar cell into three pieces.
3. The solar panel of claim 1 , wherein a respective subset comprises solar cell strips obtained by dividing n substantially square shaped solar cells into m×n strips, with each substantially square shaped solar cell being divided into m strips.
4. The solar panel of claim 1 , wherein the solar cell strip is a double-sided tunneling heterojunction photovoltaic structure, which includes:
a base layer;
first and second quantum tunneling barrier (QTB) layers deposited on both surfaces of the base layer;
an amorphous silicon emitter layer; and
an amorphous silicon surface field layer;
wherein the solar cell can absorb light from both surfaces.
5. The solar panel of claim 1 , wherein the solar cell strip comprises a first metal grid on a first side and a second metal grid on a second side, wherein the first metal grid comprises a first edge busbar located at an edge on the first side, and wherein the second metal grid comprises a second edge busbar located at an opposite edge on the second side of the solar cell.
6. The solar panel of claim 5 , wherein the first metal grid and the second metal grid comprises an electroplated Cu layer.
7. The solar panel of claim 5 , wherein two adjacent solar cell strips in a subset are positioned such that a first edge busbar of one solar cell strip is in direct contact with a second edge busbar of the other solar cell strip, thereby facilitating a serial connection between the two adjacent solar cell strips and eliminating uncovered space there between.
8. The solar panel of claim 1 , wherein the solar cell strips in a respective subset form a U-shaped string.
9. The solar panel of claim 1 , wherein the solar cell strips in the respective subset are physically coupled.