Electronic or optoelectronic device comprising at least one inorganic surface covered at least partly by an organic layer, wherein the organic layer comprises a compound comprising (i) at least one anchor group anchoring the compound to the inorganic surface, (ii) at least one functional moiety comprising (a) an aromatic heterocycle containing at least one nitrogen atom in an aromatic ring or (b) an aromatic or heteroaromatic ring substituted with at least one secondary or tertiary amine group, (iii) at least one methylidenyl group, wherein at least one of the nitrogen atoms comprised in or bound to an aromatic ring of the functional moiety is directly attached by a single bond to the methylidenyl group, and wherein the anchor group is attached to the functional moiety either directly or by a spacer.