Multi-junction solar cell, photovoltaic conversion component and compound semiconductor layer-by-layer structure

Abstract

The invention relates to a multi-junction solar cell, a photovoltaic conversion component and a compound semiconductor layer-by-layer structure. The invention provides a multi-junction solar cell with sub-cells, and a sub-cell substrate is matched with a lattice and provided with an expected band gap. The multi-junction solar cell disclosed by the invention is composed of a plurality of sub-cells (11), (12) (13) and (14) which are laminated, each sub-cell is composed of a first compound semiconductor layer and a second compound semiconductor layer which are laminated, at least a special sub-cell (11) is composed of a first layer (11A1, 11A2) and a second layer (11C), the first layer (11A1, 11A2) is composed of a 1-A(th) layer (11AA) and a 1-B(th) layer (11AB) which are laminated, the second layer (11C) is composed of a 2-A(th) layer (11CA) and a 2-B(th) layer (11CB) which are laminated, a combination-A of the 1-A(th) layer (11AA) and the 2-A(th) layer (11CA) is determined based on a band gap value of a specific sub-cell 11, a combination-B of the 1-B(th) layer (11AB) and the 2-B(th) layer (11CB) is determined based on the difference between the lattice constant of the substrate and the lattice constant of the combination-A, and the thicknesses of the 1-B(th) layer (11AB) and the 2-B(th) layer (11CB) are determined based on the difference between the lattice constant of the substrate and the lattice constant of the combination-B, the thickness of the 1-A(th) layer (11AA) and the 2-A(th) layer (11CA).

Description

technical field [0001] The present invention relates to a multi-junction (also referred to as tandem type, stacked type, stacked type) solar cell, a photoelectric conversion element, and a compound semiconductor layer stacked structure using compound semiconductors. Background technique [0002] There are many types of compound semiconductors composed of two or more elements depending on the combination of elements. Furthermore, compound semiconductor devices having various functions and physical properties can be realized by laminating a plurality of compound semiconductor layers made of different materials, and one example thereof is a solar cell. Here, as the solar cell, a silicon-based solar cell using silicon as a semiconductor, a compound semiconductor solar cell using a compound semiconductor, an organic solar cell using an organic material, etc., among them, the compound semiconductor solar cell is being developed in the Development is carried out with the aim of fu...

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Problems solved by technology

However, in the deformed heterogeneous growth method, there is a problem that the quality of the compound semiconductor is significantly lowered due to the undesired lattice mismatch that is inevitably accompanied.

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