TECHNOLOGY FOCUS - ELECTRONICS - Preferred Method: The method further comprises forming the nanocrystalline nanoparticles having metal chalcogenide ligands by ligand exchange a microwave field. In the method: the metal chalcogenide ligands that reduced edge-to-edge nanogap between the nanocrystals also reduce the amount of electron trapping organic carbon residues in the conducting media in the nanogap compared to a matrix prepared from nanoparticles having organic ligands that are otherwise identical to the semiconducting chalcogenide stabilized nanocrystalline nanoparticles having metal chalcogenide ligands used to prepare the inorganic electron conductive matrix; the composition comprises at least one of the semiconducting chalcogenide stabilized nanocrystalline nanoparticles associated with, or intercalated into graphene nanoplatelets; and the metal chalcogenide ligand is tin(IV) sulfide dimmer (Sn2S64-) (neutralized by counterions), which will form the semiconducting domain upon mild heating, where the metal chalcogenide ligand results in a weight loss of less than 20% upon heating to form the conducting medium. The method further comprises at least one of: exchanging at least a portion of the organic ligands on nanocrystalline nanoparticles having organic ligands with an inorganic chalcogenide to prepare the semiconducting chalcogenide stabilized nanocrystalline nanoparticles; preparing the semiconducting chalcogenide stabilized nanocrystalline nanoparticle compositions as a stabilized colloid by using a microwave field; associating the semiconducting chalcogenide stabilized nanocrystalline nanoparticles with the graphene platelet prior to preparing the nanocrystalline nanoparticles composition having metal chalcogenide ligand; depositing the composition by spray pyrolysis prior to the heating; or heating the nanocrystalline nanoparticles having metal chalcogenide ligands by photonic flash sintering/annealing. Preferred Components: The nanocrystalline nanoparticle is comprised of copper indium selenide, copper-indium-gallium-diselenide or copper-zinc-tin-selenide-chalcopyrite solar absorber media, where the nanocrystalline nanoparticle forms a core-shell, the metal chalcogenide ligand forms the shell, and the nanoparticle core comprises a kesterite solar absorber. In the product: the conducting has a conductivity that is more than an order of magnitude higher than a semiconducting material prepared from n-ethyl, n-butane or dodacanethiol capped nanoparticles that are otherwise identical to those used to prepare the inorganic electron conductive matrix; and the mean distance between nanoparticles in the conductive matrix is less than one third the mean distance between nanoparticles observed in a matrix prepared from n-ethyl, n-butane or dodacanethiol capped nanoparticles that are otherwise identical to those used to prepare the inorganic electron conductive matrix.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic ligands are n-ethyl thiol, n-butane thiol or dodacanethiol. EXAMPLE - No suitable example given.