Tandem solar cell and manufacturing method therefor

A method of manufacturing a tandem solar cell, the method comprising:

• a step of preparing a perovskite solar cell, including a first conductive charge transporting layer, a light absorption layer, and a second conductive charge transporting layer, on a substrate;
• a step of forming a partition part in the perovskite solar cell to form a first perovskite unit solar cell and a second perovskite unit solar cell;
• a step of forming a contact part in the first perovskite unit solar cell to expose a top surface of the first conductive charge transporting layer of the first perovskite unit solar cell by removing a certain region of each of the light absorption layer and the second conductive charge transporting layer of the first perovskite unit solar cell;
• a step of forming a buffer layer in a first portion of a top surface of each of the first perovskite unit solar cell and the second perovskite unit solar cell to expose a second portion of the top surface of each of the first perovskite unit solar cell and the second perovskite unit solar cell;
• a step of preparing a plurality of second solar cells;
• a step of bonding the plurality of second solar cells to the buffer layer to form a first unit tandem solar cell where the first perovskite unit solar cell, the buffer layer, and the second solar cell are sequentially stacked and a second unit tandem solar cell where the second perovskite unit solar cell, the buffer layer, and the second solar cell are sequentially stacked;
• and
• a step of electrically connecting the first unit tandem solar cell to the second unit tandem solar cell using a connection line,
• wherein the connection line extends from a top surface of the second solar cell of the second unit tandem solar cell to the top surface of the first conductive charge transporting layer exposed at the contact part of the first perovskite unit solar cell through side surfaces of the buffer layer and the second solar cell of the second unit tandem solar cell, the second portion of the top surface of the second perovskite unit solar cell, and a side surface of the second perovskite unit solar cell, and
• wherein the buffer layer and the plurality of second solar cell do not overlap the contact part.