# US 2026/0107680 A1 · Method for manufacturing photovoltaic cell and precursor solution of perovskite compound

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- Number: US 2026/0107680 A1
- Document ID: US20260107680A1
- Status: Published application
- Kind: A1
- Application number: 19/335,838
- Filed: 2025-09-22
- Published: 2026-04-16
- Earliest claimed: 2024-10-15
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Kohei MATSUNOBU; Kenichi OKUMURA
- Web page: https://patentgrep.com/patent/US20260107680A1

## CPC

- H10K 85/50: Organic perovskites; Hybrid organic-inorganic perovskites [HOIP], e.g. CH3NH3PbI3
- C09D 5/24: Electrically-conducting paints {(conductive materials H01B1/00)}
- C09D 7/63: organic
- H10K 30/40: comprising a p-i-n structure, e.g. having a perovskite absorber between p-type and n-type charge transport layers
- H10K 71/12: using liquid deposition, e.g. spin coating
- H10K 71/40: Thermal treatment, e.g. annealing in the presence of a solvent vapour
- Y02E 10/549: Organic PV cells
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is a method for manufacturing a perovskite-type photovoltaic cell that allows improving the power generation efficiency of photovoltaic cell. The photovoltaic cell includes a photoelectric conversion layer containing a perovskite compound represented by formula ABX3, wherein, A represents at least one cation selected from the group consisting of Cs+, CH3NH3+, and HC(NH2)2+, B represents at least one divalent cation selected from the group consisting of Pb2+ and Sn2+, and X represents at least one anion selected from the group consisting of halide anions. The precursor solution used in the method contains A, B, X1, and X2 in a molar ratio of (1+a):1:3:a, wherein X1 represents at least one anion selected from the group consisting of halide anions, X2 represents Cl−, and a represents a real number greater than 0 and less than or equal to 0.13.

## Claims

### Claim 1

A method for manufacturing a photovoltaic cell,
wherein the photovoltaic cell includes:
a photoelectric conversion layer containing a perovskite compound represented by formula (1) below:
wherein
A represents at least one cation selected from the group consisting of Cs+, CH3NH3+, and HC(NH2)2+,
B represents at least one divalent cation selected from the group consisting of Pb2+ and Sn2+, and
X represents at least one anion selected from the group consisting of halide anions,
the method comprising:
applying a precursor solution onto an application surface to form a coating; and
annealing the coating to form the photoelectric conversion layer,
wherein the precursor solution contains A, B, X1, and X2 in a molar ratio of (1+a):1:3:a,
wherein X1 represents at least one anion selected from the group consisting of halide anions,
wherein X2 represents Cl−, and
wherein a represents a real number greater than 0 and less than or equal to 0.13.

### Claim 2 (depends on 1)

The method according to claim 1,
wherein X1 represents at least one anion selected from the group consisting of Br− and I−.

### Claim 3 (depends on 1)

The method according to claim 1,
wherein B represents Pb2+.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising
dissolving at least one compound represented by formula (2) below, at least one compound represented by formula (3) below, and at least one compound represented by formula (4) below:
in a solvent to prepare the precursor solution.

### Claim 5 (depends on 1)

The method according to claim 1,
wherein a represents a real number greater than or equal to 0.03 and less than or equal to 0.1.

### Claim 6 (depends on 1)

The method according to claim 1,
wherein the photovoltaic cell further includes, in this order, a substrate, a first electrode layer, a first carrier transport layer, a second carrier transport layer, and a second electrode layer, and
wherein the photoelectric conversion layer is disposed between the first carrier transport layer and the second carrier transport layer.

### Claim 7

A precursor solution of a perovskite compound,
wherein the precursor solution contains A, B, X1, and X2 in a molar ratio of (1+a):1:3:a,
wherein A represents at least one cation selected from the group consisting of Cs+, CH3NH3+, and HC(NH2)2+,
wherein B represents at least one divalent cation selected from the group consisting of Pb2+ and Sn2+,
wherein X1 represents at least one anion selected from the group consisting of halide anions,
wherein X2 represents Cl−, and
wherein a represents a real number greater than 0 and less than or equal to 0.13.

### Claim 8 (depends on 7)

The precursor solution according to claim 7,
wherein X1 represents at least one anion selected from the group consisting of Br− and I−.

### Claim 9 (depends on 7)

The precursor solution according to claim 7,
wherein B represents Pb2.

### Claim 10 (depends on 7)

The precursor solution according to claim 7,
wherein a represents a real number greater than or equal to 0.03 and less than or equal to 0.1.