MULTI-JUNCTION SOLAR CELL IN FORM OF STACK WITH FRONT SIDE IN CONTACT WITH BACKSIDE Russian patent published in 2021 - IPC H01L31/224 H01L31/05 H01L31/687 

FIELD: solar cells.

SUBSTANCE: present invention relates to a multi-junction solar cell in the form of a stack with the front side in contact with the backside, having a germanium substrate forming its backside, a germanium sub-element and at least two sub-elements of elements of III-V groups following each other in the specified order, as well as at least one through contact hole reaching from the front side of the cell through the sub-elements to the backside, and the metal closing contact passing through this through contact hole. The through contact hole has a solid side surface and an oval contour in cross-section. The diameter of the through contact hole decreases stepwise in the direction from the front side to the backside of the multi-junction solar cell. The front side of the germanium sub-element forms a protruding inward into the through contact hole, first step, encircling it, having the first depth of the step protrusion. At the same time, a second step protruding inward into the through contact hole, encircling it, having the second depth of the step protrusion, is formed from the area of the germanium sub-element located below the p-n junction of this germanium sub-element.

EFFECT: invention provides a high level of reliability in operation and efficiency at relatively low manufacturing costs.

10 cl, 4 dwg