Method of forming metal chalcogenide dispersion, metal chalcogenide dispersion, method of producing light absorbing layer of solar cell, method of producing solar cell

A method of producing a metal chalcogenide dispersion usable in forming a light absorbing layer of a solar cell, the method comprising:

• a metal chalcogenide nano particle formation step in which at least one metal or metal compound selected from the group consisting of a group 11 metal, a group 12 metal, a group 13 metal, a group 14 metal, a group 15 metal, a group 11 metal compound, a group 12 metal compound, a group 13 metal compound, a group 14 metal compound and a group 15 metal compound, a solvent containing water as a main component, and a group 16 element-containing compound are mixed together to obtain metal chalcogenide nano particles;
• and
• an addition step in which a compound (1) represented by general formula (1) shown below is added to the metal chalcogenide nano particles, thereby obtaining a metal chalcogenide dispersion:
• wherein R1 to R4 each independently represents an alkyl group, an aryl group or a hydrogen atom;
• provided that at least one of R1 to R4 represents an alkyl group or an aryl group;
• when R1 and R2 each independently represents an alkyl group or an aryl group, R1 and R2 may be mutually bonded to form a ring with the nitrogen atom;
• and when R3 and R4 each independently represents an alkyl group or an aryl group, R3 and R4 may be mutually bonded to form a ring with the nitrogen atom.