Method for manufacturing solar cell

1 . A method for manufacturing a solar cell, the method comprising:

forming a first cell, the forming of the first cell including:

forming, on a first substrate: a first electrode layer, a first electron transport layer, a first photoelectric conversion layer including a first perovskite compound, a first hole transport layer, and a second electrode layer, in the order stated;

forming a second cell, the forming of the second cell including:

forming, on a second substrate: a fourth electrode layer, a second hole transport layer, a second photoelectric conversion layer including a second perovskite compound, a second electron transport layer, and a third electrode layer, in the order stated;

disposing the first cell and the second cell such that the second electrode layer of the first cell and the third electrode layer of the second cell are disposed opposite to each other and are spaced apart from each other without direct contact;

joining a periphery of the first substrate and a periphery of the second substrate with a sealing member to fix relative positions of the first cell and the second cell and to maintain a space between the second electrode layer and the third electrode layer; and

one of the following (i), (ii), or (iii):

(i) electrically connecting the first electrode layer of the first cell and the fourth electrode layer of the second cell to each other,

(ii) electrically connecting the second electrode layer of the first cell and the third electrode layer of the second cell to each other, or

(iii) electrically connecting the first electrode layer of the first cell and the third electrode layer of the second cell to each other, and electrically connecting the second electrode layer of the first cell and the fourth electrode layer of the second cell to each other; wherein

the first perovskite compound has a bandgap greater than a bandgap of the second perovskite compound.

2 . The method according to claim 1 , wherein

the first electron transport layer includes a metal oxide.

3 . The method according to claim 2 , wherein

the metal oxide includes, as a major component, at least one selected from the group consisting of titanium oxide and tin oxide.

4 . The method according to claim 1 , further comprising:

forming a filler between the second electrode layer and the third electrode layer, the filler including at least one selected from the group consisting of epoxy resins, silicone resins, and polyolefin-based resins.

5 . The method according to claim 1 , wherein

the method includes the electrically connecting of the first electrode layer of the first cell and the fourth electrode layer of the second cell to each other, where the first electrode layer and the fourth electrode layer are electrically connected to each other with a wire.

6 . The method according to claim 1 , wherein

the method includes the electrically connecting of the second electrode layer of the first cell and the third electrode layer of the second cell to each other, where the second electrode layer and the third electrode layer are electrically connected to each other with a wire.

7 . The method according to claim 1 , wherein

the method includes the electrically connecting of the first electrode layer of the first cell and the third electrode layer of the second cell to each other, and the electrically connecting the second electrode layer of the first cell and the fourth electrode layer of the second cell to each other, where the first electrode layer and the third electrode layer are electrically connected to each other with a wire, and the second electrode layer and the fourth electrode layer are electrically connected to each other with a wire.

8 . The method according to claim 1 , further comprising configuring the solar cell to have a two-terminal structure such that electricity is drawn to an external circuit via only two terminals.

9 . The method according to claim 1 , further comprising configuring the solar cell to have a two-terminal structure such that electricity is drawn to an external circuit via only the second electrode layer and the third electrode layer as two external terminals.

10 . The method according to claim 1 , further comprising configuring the solar cell to have a two-terminal structure such that electricity is drawn to an external circuit via only the first electrode layer and the fourth electrode layer as two external terminals.

11 . The method according to claim 1 , wherein

the electrically connecting of the first electrode layer and the third electrode layer to each other includes electrically connecting the first electrode layer and the third electrode layer to each other to constitute a first terminal,

the electrically connecting of the second electrode layer and the fourth electrode layer to each other includes electrically connecting the second electrode layer and the fourth electrode layer to each other to constitute a second terminal, and

electricity is drawn to an external circuit via only the first terminal and the second terminal.