Abstract: The present invention aims to provide a solar cell having high durability against deterioration due to moisture ingress from the side surfaces. The solar cell 10 of the present invention includes: first and second electrodes 12 and 17; a perovskite layer 14 provided between the first and second electrodes 12 and 17 and containing an organic-inorganic perovskite compound (A) represented by the formula RMX3 where R is an organic molecule, M is a metal atom, and X is a halogen atom; and a side-surface-protecting layer 15 provided on a peripheral side of the perovskite layer 14 to coat at least part of a side surface of the perovskite layer 14, the side-surface-protecting layer 15 containing at least one selected from the group consisting of a metal halide (B1) and an organometal halide (B2) or containing an organohalide (C).

Abstract: The present invention aims to provide a solar cell that includes a photoelectric conversion layer containing an organic-inorganic perovskite compound and that can exhibit high photoelectric conversion efficiency and high heat resistance. Provided is a solar cell including, in the stated order: a cathode; a photoelectric conversion layer; and an anode, the photoelectric conversion layer containing an organic-inorganic perovskite compound represented by the formula R-M-X3 where R is an organic molecule, M is a metal atom, and X is a halogen atom or a chalcogen atom, and a polymer having an acid dissociation constant pKa of 3 or less.

Abstract: The present invention aims to provide a solar cell having high photoelectric conversion efficiency that is less likely to decrease even under prolonged application of a voltage.

Abstract: The present invention aims to provide a photoelectric conversion element having high photoelectric conversion efficiency, a method for producing the photoelectric conversion element, and a solar cell including the photoelectric conversion element. Provided is a photoelectric conversion element containing a perovskite compound represented by the formula AMX wherein A represents an organic base compound and/or an alkali metal, M represents a lead or tin atom, and X is a halogen atom, the photoelectric conversion element having an intensity ratio of a nitrate ion to a halogen ion (NO3/X) of 0.0010 or more and less than 0.2000 as determined by TOF-SIMS measurement.

Abstract: The present invention aims to provide a flexible solar cell having excellent high-temperature, high-humidity durability and excellent initial performance. The present invention relates to a flexible solar cell including, on a flexible substrate: an electrode; a transparent electrode; and a photoelectric conversion layer disposed between the electrode and the transparent electrode, the photoelectric conversion layer containing an organic-inorganic perovskite compound, the flexible substrate including an aluminum foil and an aluminum oxide film formed on the aluminum foil, the flexible substrate having a ratio of the thickness of the aluminum oxide film to the total thickness of the aluminum foil and the aluminum oxide film of 0.1% or higher and 15% or lower.

Abstract: The present invention aims to provide a solar cell in which a decrease in photoelectric conversion efficiency due to continuous exposure to light (photodegradation) is reduced, and a method of producing the solar cell.

Abstract: The present invention aims to provide a method for producing a solar cell in which a continuous long scribed line is provided along the machine direction of a substrate so that failures due to breakage of the scribed line are reduced.

Abstract: The present invention aims to provide a solar cell excellent in photoelectric conversion efficiency, in which reduction in the photoelectric conversion efficiency due to continuous irradiation with light (photodegradation) is suppressed and the photoelectric conversion layer is less likely to suffer corrosion. The present invention provides a solar cell having a structure including: a cathode; an electron transport layer; a photoelectric conversion layer; and an anode stacked in the stated order, the photoelectric conversion layer including an organic-inorganic perovskite compound represented by the formula: R-M-X3 where R represents an organic molecule, M represents a metal atom, and X represents a halogen or chalcogen atom, the cathode being formed of a titanium material and having an oxide layer on at least one surface.

Abstract: The present invention aims to provide a solar cell that includes a photoelectric conversion layer containing an organic-inorganic perovskite compound and that can exhibit high photoelectric conversion efficiency and high heat resistance. Provided is a solar cell including, in the stated order: a cathode; a photoelectric conversion layer; and an anode, the photoelectric conversion layer containing an organic-inorganic perovskite compound represented by the formula R-M-X3 where R is an organic molecule, M is a metal atom, and X is a halogen atom or a chalcogen atom, and a polymer having an acid dissociation constant pKa of 3 or less.

Abstract: The present invention aims to provide a solar cell having high durability against deterioration due to moisture ingress from the side surfaces. The solar cell 10 of the present invention includes: first and second electrodes 12 and 17; a perovskite layer 14 provided between the first and second electrodes 12 and 17 and containing an organic-inorganic perovskite compound (A) represented by the formula RMX3 where R is an organic molecule, M is a metal atom, and X is a halogen atom; and a side-surface-protecting layer 15 provided on a peripheral side of the perovskite layer 14 to coat at least part of a side surface of the perovskite layer 14, the side-surface-protecting layer 15 containing at least one selected from the group consisting of a metal halide (B1) and an organometal halide (B2) or containing an organohalide (C).

Abstract: A first object of the present invention is to provide a solar cell having excellent photoelectric conversion efficiency and produced through a process including favorable scribing (e.g., mechanical patterning), and a method for producing the solar cell. A first aspect of the present invention provides a solar cell including, above a flexible substrate, an electrode, a transparent electrode, and a photoelectric conversion layer disposed between the electrode and the transparent electrode, the solar cell further including a hard film disposed between the flexible substrate and the electrode, the hard film containing a nitride, carbide, or boride, the nitride, carbide, or boride containing at least one element selected from the group consisting of titanium, zirconium, aluminum, silicon, magnesium, vanadium, chromium, molybdenum, tantalum, and tungsten.

Abstract: The present invention aims to provide a solar cell having high photoelectric conversion efficiency that is less likely to decrease even under application of a voltage for a long period of time. Provided is a solar cell including: a cathode; a photoelectric conversion layer; and an anode in the stated order, the photoelectric conversion layer including an organic-inorganic perovskite compound represented by the formula: R-M-X3 wherein R represents an organic molecule, M represents a metal atom, and X represents a halogen or chalcogen atom, the solar cell further including, between the photoelectric conversion layer and the anode layer, a diffusion prevention layer including at least one selected from the group consisting of: metal oxides, metal nitrides, and metal oxynitrides each containing a group 6 to 15 metal in the periodic table; and carbon.

Abstract: An object of the present invention is to provide a solar cell that is excellent in photoelectric conversion efficiency, suffers little degradation during encapsulation (initial degradation), has high-humidity durability, and is excellent in temperature cycle resistance. The present invention provides a solar cell including: a laminate having an electrode, a counter electrode, and a photoelectric conversion layer disposed between the electrode and the counter electrode; and an encapsulation material covering the counter electrode to encapsulate the laminate, the photoelectric conversion layer including an organic-inorganic perovskite compound represented by the formula: R-M-X3, R representing an organic molecule, M representing a metal atom, X representing a halogen atom or a chalcogen atom, the encapsulation material including a resin having at least one skeleton selected from the group consisting of polyisobutylene, polyisoprene, and polybutadiene.

Abstract: The present invention aims to provide a solar cell having high photoelectric conversion efficiency and excellent high-temperature, high-humidity durability. The present invention relates to a solar cell including at least: a photoelectric conversion layer; a hole transport layer; and an anode, the hole transport layer being disposed between the photoelectric conversion layer and the anode, the hole transport layer containing a polymer containing a halogen atom and an organic semiconductor component (1), the polymer containing a halogen atom having a structure that contains a halogen atom and an electron-withdrawing group bonded to a hetero atom.

Abstract: The present invention aims to provide a solar cell having high photoelectric conversion efficiency and excellent high-temperature durability, and an organic semiconductor material. The present invention relates to a solar cell having: an electrode; a counter electrode; a photoelectric conversion layer disposed between the electrode and the counter electrode; and a hole transport layer disposed between the photoelectric conversion layer and the counter electrode, the hole transport layer containing an ionic compound that contains an organic semiconductor cation and a fluorine-containing compound anion, the hole transport layer having a metal concentration of 1,000 ppm or lower.

Abstract: The present invention aims to provide a solar cell excellent in high-temperature, high-humidity durability. The present invention aims to provide a solar cell including: a cathode; an anode; and a photoelectric conversion layer disposed between the cathode and the anode, the photoelectric conversion layer containing an organic-inorganic perovskite compound represented by the formula R-M-X3 where R is an organic molecule, M is a metal atom, and X is a halogen atom or a chalcogen atom, at least one of the cathode and the anode having a resin layer disposed thereon, the resin layer having an inorganic layer disposed thereon, the resin layer having a glass transition temperature of 70° C. or higher and 200° C. or lower, and having a coefficient of linear expansion of 9.0×10?6K?1 or greater and 1.5×10?4K?1 or smaller.

Abstract: There is provided a solar cell which is excellent in gas barrier properties and in which the deterioration of wirings does not easily occur. The solar cell (1) comprises: a first electrode (2); a second electrode (7) arranged so as to face the first electrode (2); a photoelectric conversion layer (5) which is arranged between the first electrode (2) and the second electrode (7) and contains an organic-inorganic perovskite compound; a plurality of auxiliary wirings (8) provided on the second electrode (7); a resin layer (9) provided on the second electrode (7) so as to fill a space between the plurality of auxiliary wirings (8); and an inorganic layer (10) provided so as to cover the plurality of auxiliary wirings (8) and the resin layer (9).

Abstract: The present invention aims to provide a flexible solar cell including a photoelectric conversion layer that contains an organic-inorganic perovskite compound and being excellent in light resistance and photoelectric conversion efficiency. The present invention relates to a flexible solar cell having a structure including: a metal foil; an electron transport layer; a photoelectric conversion layer; a hole transport layer; and a transparent electrode stacked in the stated order, the photoelectric conversion layer containing an organic-inorganic perovskite compound represented by the formula: R-M-X3 where R represents an organic molecule, M represents a metal atom, and X represents a halogen atom or a chalcogen atom.

Abstract: The present invention aims to provide a solar cell in which a decrease in photoelectric conversion efficiency due to continuous exposure to light (photodegradation) is reduced, and a method of producing the solar cell.

Abstract: The present invention aims to provide a solar cell that is excellent in photoelectric conversion efficiency, suffers little degradation during encapsulation (initial degradation), and has excellent durability. The present invention relates to a solar cell including: a laminate having an electrode, a counter electrode, and a photoelectric conversion layer disposed between the electrode and the counter electrode; and an inorganic layer covering the counter electrode to encapsulate the laminate, the photoelectric conversion layer including an organic-inorganic perovskite compound represented by the formula: R-M-X3, R representing an organic molecule, M representing a metal atom, X representing a halogen atom or a chalcogen atom, the inorganic layer containing a metal oxide, a metal nitride, or a metal oxynitride.