A Pb-free Sn-halide Perovskite solar cell with improved photoelectric conversion efficiency is provided. A solar cell uses a perovskite compound represented by ABX.sub.3 where A is a cation, B is a metal, and X is a halogen, wherein each of A, B and X may be composed of a plurality of elements, and B includes Sn and Ge.

A Pb-free Sn-halide Perovskite solar cell with improved photoelectric conversion efficiency is provided. A solar cell uses a perovskite compound represented by ABX.sub.3 where A is a cation, B is a metal, and X is a halogen, wherein each of A, B and X may be composed of a plurality of elements, and B includes Sn and Ge.

Provided is a nanoparticle including: a core structure; and a shell structure covering the core structure and separated from the core structure by a nanogap, wherein a macrocyclic host molecule exhibiting hydrophobicity inside and hydrophilicity outside and a Raman-active material inserted into the macrocyclic host molecule are provided on a surface of the core structure, and the macrocyclic host molecule and the Raman-active material fill the nanogap.

Provided is a nanoparticle including: a core structure; and a shell structure covering the core structure and separated from the core structure by a nanogap, wherein a macrocyclic host molecule exhibiting hydrophobicity inside and hydrophilicity outside and a Raman-active material inserted into the macrocyclic host molecule are provided on a surface of the core structure, and the macrocyclic host molecule and the Raman-active material fill the nanogap.

The present invention provides a high-purity arylsulfonic acid amine salt vinyl monomer which is an extremely industrially useful arylsulfonic acid monomer with excellent storage stability and amphiphilic solubility in both water and organic solvents, a simple and practical method for producing the same, a polyarylsulfonic acid amine salt which is a polymer thereof, and a method for producing the same. In the arylsulfonic acid amine salt vinyl monomer, a tertiary amine having 2 or 3 different substituents that each have 1 to 7 carbon atoms and also containing at least one or more of tertiary carbon or quaternary carbon or cyclic skeleton in the structure is applied to an amine moiety thereof, and in addition, a polyarylsulfonic acid amine salt having high purity in terms of sulfonation rate and polymerization conversion rate and a polymer thereof are used.

The present invention provides a high-purity arylsulfonic acid amine salt vinyl monomer which is an extremely industrially useful arylsulfonic acid monomer with excellent storage stability and amphiphilic solubility in both water and organic solvents, a simple and practical method for producing the same, a polyarylsulfonic acid amine salt which is a polymer thereof, and a method for producing the same. In the arylsulfonic acid amine salt vinyl monomer, a tertiary amine having 2 or 3 different substituents that each have 1 to 7 carbon atoms and also containing at least one or more of tertiary carbon or quaternary carbon or cyclic skeleton in the structure is applied to an amine moiety thereof, and in addition, a polyarylsulfonic acid amine salt having high purity in terms of sulfonation rate and polymerization conversion rate and a polymer thereof are used.

Provided are a quaternary ammonium salt and a preparation method and use thereof as an inhibitor, and a water-based drilling fluid and use thereof. The quaternary ammonium salt has a structure shown in formula I, wherein, in the formula I, R.sub.1 is selected from the group consisting of —H and —COOH; R.sub.2 is selected from the group consisting of —H and —CH.sub.2—COOH; R.sub.3 is selected from the group consisting of —NH—CH.sub.2—CH.sub.2—CH.sub.2—NH.sub.2, —NH—CH.sub.2—CH.sub.2—NH.sub.2, —NH—CH.sub.2—CH.sub.2—OH, —O—CH.sub.2—CH.sub.2—NH.sub.2, —N—(CH.sub.2—CH.sub.2—OH).sub.2, and —O—CH.sub.2—CH.sub.2—NH—CH.sub.2—CH.sub.2—OH; and n and m are independently 10 to 15. ##STR00001##

Provided are a quaternary ammonium salt and a preparation method and use thereof as an inhibitor, and a water-based drilling fluid and use thereof. The quaternary ammonium salt has a structure shown in formula I, wherein, in the formula I, R.sub.1 is selected from the group consisting of —H and —COOH; R.sub.2 is selected from the group consisting of —H and —CH.sub.2—COOH; R.sub.3 is selected from the group consisting of —NH—CH.sub.2—CH.sub.2—CH.sub.2—NH.sub.2, —NH—CH.sub.2—CH.sub.2—NH.sub.2, —NH—CH.sub.2—CH.sub.2—OH, —O—CH.sub.2—CH.sub.2—NH.sub.2, —N—(CH.sub.2—CH.sub.2—OH).sub.2, and —O—CH.sub.2—CH.sub.2—NH—CH.sub.2—CH.sub.2—OH; and n and m are independently 10 to 15. ##STR00001##

A phenalene-1-one compound, a photosensitizer composition including the phenalene-1-one compound, an article including the phenalene-1-one compound and/or photosensitizer composition and the use thereof.

A phenalene-1-one compound, a photosensitizer composition including the phenalene-1-one compound, an article including the phenalene-1-one compound and/or photosensitizer composition and the use thereof.