High-efficient four solar cell and manufacturing method thereof

Abstract

The invention discloses a high-efficient four solar cell and a manufacturing method thereof. The method is characterized by: providing a double-sided polishing substrate, which is used for growing an extension of a semiconductor; forming a first sub-cell on a front side of the substrate so that the first sub-cell possesses a first band gap; forming a gradient buffer layer above the first sub-cell so that the gradient buffer layer possesses a second band gap which is greater than the first band gap; forming a second sub-cell above the gradient buffer layer so that the second sub-cell possesses a third band gap which is greater than the second band gap; forming a high doping cap layer above the second sub-cell; forming a third sub-cell on a back side of the substrate, wherein the third sub-cell grows at an inversed direction and possesses a fourth band gap which is less than the first band gap; forming a fourth sub-cell under the third sub-cell, wherein the fourth sub-cell grows at an inversed direction and possesses a fifth band gap which is less than the fourth band gap; extending to form a back contact layer under the fourth sub-cell and acquiring the needed solar cell. By using the method of the invention, the high-efficient four solar cell with current matching and a wide spectrum absorption scope can be manufactured.

Description

technical field [0001] The invention relates to a high-efficiency four-junction solar cell and a preparation method thereof, belonging to the technical field of semiconductor materials. Background technique [0002] In the 21st century, the world's population is increasing rapidly, environmental pollution is serious, energy sources are depleted and the ecological environment is deteriorating, which makes human beings have a greater demand for energy, especially the development and utilization of clean new energy. Since the sun is an inexhaustible and inexhaustible energy source, the study of the utilization of solar energy has always been one of the major contemporary issues. Solar cells have the advantages of long life, high efficiency, reliable performance, low cost and no pollution. Almost all space equipment and devices use solar cells. III-V compound semiconductor solar cells have attracted much attention due to their high photoelectric conversion efficiency. Among th...

AI Technical Summary

Problems solved by technology

For stacked cells, the efficiency of each sub-cell is the highest when the currents of each sub-cell are equal, and the current mismatch will cause the recombination loss of the current and reduce the efficiency.

Flip-chip grown GaInP / GaAs / InGaAs triple-junction solar cells can effectively solve the problem of current matching, but the later process is complex and the absorption of low-energy photons is weakened

Images