Copper-containing nanocrystals and methods of preparation therefor

摘要

A one-pot approach for preparing ArSH capped Cu2ZnSnS4, Cu2ZnSn(S(1-x)Sex)4, Cu2SnS3, CuInS2, and CuIn(S(1-x)Sex)2 nanocrystals is provided. Examples involving reacting copper (II) acetylacetonate and indium chloride with thiourea and 2-mercapto-5-n-propylpyrimidine in the presence of an organic solvent are described. Monodispersed CuInS2, nanocrystals having a size of about 100 nm were prepared. Examples involving reacting copper (II) acetylacetonate, zinc chloride, and tin chloride with thiourea and 2-mercapto-5-n-propylpyrimidine in the presence of an organic solvent are described. Monodispersed Cu2ZnSnS4 nanocrystals having a size of about 2 nm were prepared. Nanociystals obtained were found to have excellent crystallinity, stoichiometry, and high collective photovoltaic activity without the need for postprocessing such as high temperature annihilation in a sulfur atmosphere.

主权项

1. A method of forming inorganic nanoparticles comprising copper, sulfur and optionally selenium, and a first other metal or first and second other metals, the method comprising forming the nanoparticles by reacting one or the other or both of Cu1+ and Cu2+, a compound of the first other metal or a compound of the first and second other metals, and a thiourea, in the presence of a capping agent of the formula ArSH and a reducing solvent system and optionally a selenium source, to form a mixture containing nanoparticles.