Abstract: A multilayer body of the present disclosure includes a support, a bismuth-including layer, and an intermediate layer. The bismuth-including layer includes at least one selected from the group consisting of pure bismuth, a bismuth alloy, bismuth oxide, and a composite oxide including bismuth. The intermediate layer includes at least one selected from the group consisting of pure zinc, a zinc alloy, pure tin, a tin alloy, pure lead, and a lead alloy. Additionally, the intermediate layer is disposed between the bismuth-including layer and the support in a thickness direction of the bismuth-including layer.

Abstract: A capacitor of the present disclosure includes a first electrode, a second electrode, and a dielectric. The second electrode is disposed to face a principal surface of the first electrode. The dielectric is disposed between the first electrode and the second electrode. The dielectric is in contact with the first electrode and the second electrode. A surface of the second electrode extends, for example, parallel to a surface of the first electrode, the surfaces each being in contact with the dielectric. An electrical conductivity ?x of the dielectric in a particular direction perpendicular to the principal surface and an electrical conductivity ?y of the dielectric in a direction perpendicular to the particular direction satisfy a relation ?x/?y?0.01.

Abstract: A dielectric of the present disclosure includes a tantalum compound containing fluorine and oxygen and being amorphous, and is advantageous in terms of achieving a high dielectric constant.

Abstract: A capacitor includes a first electrode layer, a second electrode layer, and an antiferroelectric layer. The antiferroelectric layer is disposed between the first electrode layer and the second electrode layer in a thickness direction of the first electrode layer. The antiferroelectric layer has a thickness differing from one point to another.

Abstract: The electrode catalyst ink for a water electrolysis cell includes a catalyst including a layered double hydroxide, an organic polymer, and a solvent. The Hansen solubility parameter distance Ra1 between the solvent and the catalyst is 15.0 MPa½ or more and less than 20.5 MPa½. The Hansen solubility parameter distance Ra2 between the solvent and the organic polymer is 10.0 MPa½ or more and 14.0 MPa½ or less.

Abstract: The electrode catalyst ink includes a catalyst including a layered double hydroxide, an organic polymer, and a solvent. The solvent includes a first solvent, a second solvent, and a third solvent. The third solvent has a boiling point higher than a boiling point of the first solvent and higher than a boiling point of the second solvent. The Hansen solubility parameter distance Ra1 [MPa1/2] between the third solvent and the catalyst and the Hansen solubility parameter distance Ra2 [MPa1/2] between the third solvent and the organic polymer satisfy a relationship of 2.08Ra1?16.0?Ra2?2.08Ra1?13.5.

Abstract: An electrode catalyst for a water electrolysis cell includes a catalyst, and a polymer of intrinsic microporosity having a Tröger's base skeleton containing a quaternary ammonium group. A water electrolysis cell includes an anode, a cathode, and an electrolyte membrane. The electrolyte membrane is disposed between the anode and the cathode. At least one selected from the group consisting of the anode and the cathode includes the electrode catalyst.

Abstract: An electrode catalyst for a water electrolysis cell includes a catalyst and a polymer of intrinsic microporosity, and the polymer of intrinsic microporosity is neutral.

Abstract: An electrode catalyst for a water electrolysis cell includes a catalyst, a support, and an organic compound. The catalyst is a layered double hydroxide that contains a chelating agent. The support contains a transition metal. The organic compound has an anionic functional group.

Abstract: A catalyst includes a layered double hydroxide and a metal particle. The layered double hydroxide includes ions of at least two transition metals. The metal particle includes at least one transition metal. The metal particle has a surface coated with the layered double hydroxide.

Abstract: A light-absorbing material contains a compound represented by the composition formula HC(NH2)2SnI3 and having a perovskite structure. A solid-state 1H-NMR spectrum, which is obtained by 1H-14N HMQC measurement in two-dimensional NMR at 25° C., of the compound includes a first peak at 6.9 ppm and a second peak at 7.0 ppm. A peak intensity of the first peak is equal to 80% or more of a peak intensity of the second peak.

Abstract: A photosensor includes a first electrode, a second electrode that opposes the first electrode, and a photoelectric conversion layer that is disposed between the first electrode and the second electrode and converts incident light into electric charges. At least one electrode selected from the group consisting of the first electrode and the second electrode is light-transmissive. The photoelectric conversion layer contains a perovskite compound. The fluorescence spectrum of the perovskite compound has a first peak at a first wavelength and a second peak at a second wavelength that is longer than the first wavelength. The photoelectric conversion layer is in ohmic contact with each of the first electrode and the second electrode.

Abstract: The present disclosure provides a photoabsorber containing: a perovskite compound represented by the composition formula ABX3, where A represents a monovalent cation, B represents a divalent cation including a Sn cation, and X represents a halogen anion; and a trivalent cation of a Group 3 element.

Abstract: Provided is a solar cell comprising a first electrode; a second electrode; a photoabsorber layer located between the first electrode and the second electrode; a first semiconductor layer located between the first electrode and the photoabsorber layer; and a second semiconductor layer located between the second electrode and the photoabsorber layer. At least one electrode selected from the group consisting of the first electrode and the second electrode is light-transmissive. The photoabsorber layer contains a perovskite compound represented by the composition formula AMX3 (where A represents a monovalent cation, M represents a divalent cation, and X represents a halogen anion). The first semiconductor layer contains Li. The second semiconductor layer contains LiN(SO2CnF2n+1)2 (where n is a natural number of not less than 2).

Abstract: The present disclosure provides a photoabsorber containing: a perovskite compound represented by the composition formula ABX3, where A represents a monovalent cation, B represents a divalent cation including a Sn cation, and X represents a halogen anion; and a trivalent cation of a Group 3 element.

Abstract: The present disclosure provides a photoabsorber which has a perovskite crystal structure and is represented by the composition formula ABX3, wherein A is a monovalent cation including formamidinium cation A1 and a nitrogen-containing cation A2; the nitrogen-containing cation A2 has a larger ionic radius than the formamidinium cation A1; B is a divalent cation including a Sn cation; and X is a halogen anion. The photoabsorber according to the present disclosure improves conversion efficiency of the perovskite solar cell.

Abstract: The present disclosure provides a photoabsorber containing: a perovskite compound represented by the composition formula ABX3, where A represents a monovalent cation, B represents a divalent cation including a Sn cation, and X represents a halogen anion; and a metal Sn.

Abstract: A solar cell system includes a solar cell that includes a first electrode, a second electrode that faces the first electrode, and a light absorbing layer that is located between the first electrode and the second electrode, and converts light into charges; a power supply that applies voltage between the first electrode and the second electrode; and a voltage controller. The light absorbing layer contains a compound having a perovskite crystal structure represented by AMX3 where A represents a monovalent cation, M represents a divalent cation, and X represents a halogen anion. The voltage controller controls the voltage of the power supply so that during a first period of non-power generation, an electric current of 1 ?A/cm2 or more and 100 ?A/cm2 or less flows in the light absorbing layer in a direction opposite to a direction in which an electric current flows during power generation.

Abstract: A light absorption material comprising: a compound having a perovskite crystal structure represented by ABX3 where the A site contains (NH2)2CH+, the B site contains Pb2+, and the X site contains I?. A ratio of the number of atoms of I to the number of atoms of Pb measured by an X-ray photoelectron spectroscopy is 2.7 or less, or a ratio of the number of atoms of I to the number of atoms of Pb measured by a Rutherford backscattering spectroscopy is 2.9 or less.

Abstract: A solar cell comprises a first electrode, a second electrode opposite to the first electrode, and a photoabsorber layer located between the first electrode and the second electrode and including a first layer and a second layer. The first layer contains a first compound which has a perovskite structure represented by the composition formula A1M1X13, where A1 is a monovalent cation, M1 is a divalent cation, and X1 is a halogen anion. The second layer contains a second compound which has a perovskite structure represented by the composition formula A2M2X23, where A2 is a monovalent cation, M2 is a divalent cation, and X2 is a halogen anion, and has a different composition from the first compound. At least one of the first compound in the first layer and the second compound in the second layer has a single orientation.