n-TYPE SEMICONDUCTOR LAYER, THERMOELECTRIC CONVERSION LAYER, THERMOELECTRIC CONVERSION ELEMENT, THERMOELECTRIC CONVERSION MODULE, AND COMPOSITION FOR FORMING n-TYPE SEMICONDUCTOR LAYER

A composition for forming an n-type semiconductor layer, comprising:

• a nanocarbon material;
• and
• an onium salt represented by Formula (1),
• in Formula (1),
• R11, R12, R13, and R14 each independently represent a monovalent organic group selected from the group consisting of an aliphatic hydrocarbon group, an aralkyl group, an aryl group, and a heterocyclic group, and the aliphatic hydrocarbon group may be any of a linear, branched, or cyclic aliphatic hydrocarbon group and may contain a heteroatom, and
• X− represents F−, Cl−, Br−, I−, P(═O)(OH)2O−, or NO3−,
• in a case where X− represents Cl−, Br−, I−, or NO3−, at least any two or more groups among R11 to R14 each independently represent a monovalent organic group having 8 or more carbon atoms, in a case where X− represents P(═O)(OH)2O−, at least any two or more groups among R11 to R14 each independently represent a monovalent organic group having 6 or more carbon atoms, and in a case where X− represents F−, at least any two or more groups among R11 to R14 each independently represent a monovalent organic group having 1 or more carbon atoms.