“…Cu acts as a donor when intercalated into van der Waals gaps, [19][20][21][22] while it acts as an acceptor substituted into Bi sites in Bi 2 Te 3 . [23][24][25] In this study, the influence of Cu addition in polycrystalline InSe alloys depending on the doping site (intercalation or substitution) was investigated by synthesizing Cu x InSe (x = 0, 0.01, 0.02, 0.03, and 0.05) and In 1Ày Cu y Se (y = 0, 0.01, 0.02, 0.03, and 0.05) samples, as Cu can be intercalated into van der Waals gaps or substituted at In sites in InSe. 26 Electrical and thermal properties, including s, S, and k tot , were evaluated.…”