Lattice gradient buffer layer applied to lattice mismatch solar cell epitaxial growth

Abstract

The invention discloses a lattice gradient buffer layer applied to lattice mismatch solar cell epitaxial growth. The lattice gradient buffer layer is located between a lattice mismatch epitaxial material of a lattice mismatch solar cell and a substrate (or an epitaxial layer with the same lattice constant as the substrate). The lattice gradient buffer layer is formed by stacking a plurality of sets of composite DBRs with different reflection wave bands, wherein each set of composite DBR is composed of a plurality of DBR pairs stacked together, lattice constants between adjacent DBR pairs are in gradient change, each DBR pair comprises two semiconductor material layers, and the two semiconductor material layers are different in refractive index but identical in lattice constant or mismatchcapable of achieving strain compensation exists. According to the invention, the composite DBRs with wide-spectrum reflection are organically fused into the lattice gradient buffer layer, so that thedensity of defects such as a large number of dislocations introduced by growth of a lattice mismatch epitaxial material can be greatly reduced, the effect of a reflector can be fully exerted, the process steps, the growth duration and the raw material loss are reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, in particular to a lattice gradient buffer layer applied to the epitaxial growth of lattice-mismatched solar cells. Background technique [0002] With the development of modern industrial technology, energy has become the most important material basis for determining social progress in the survival and development of human society. With the development of society, coal, oil, natural gas, etc. pollute the environment seriously and non-renewable energy sources are gradually decreasing. , so the development of green new energy is imminent. Solar energy is inexhaustible and inexhaustible clean energy, so the research and development of solar cell technology will alleviate the future energy shortage to a certain extent. From the perspective of the development of photovoltaic power generation technology, solar cells can be roughly divided into three categories: the first ge...

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Problems solved by technology

The results of a large number of irradiation experiments show that the radiation resistance of GaInAs sub-cells is much worse than that of GaInP sub-cells. Some analysts believe that the reason is that the atomic radius of As is larger, and its position is not easy to recover after high-energy particles are irradiated.

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