The paper presents a study of the structural and electrophysical parameters of sandwich structures of the conductive electrode type—a flm of colloidal quantum dots of silver sulfde (QDs Ag2S/SiO2) and Au plasmon nanoparticles—the second conductive...
The paper presents a study of the structural and electrophysical parameters of sandwich structures of the conductive electrode type—a flm of colloidal quantum dots of silver sulfde (QDs Ag2S/SiO2) and Au plasmon nanoparticles—the second conductive electrode. The methods of transmission electron microscopy (TEM), including high-resolution TEM, IR absorption spectroscopy, were used, and the current–voltage characteristics were analyzed. It is shown that Ag2S/SiO2 QD reveals a crystalline cross section of 1.6 nm in the monoclinic modifcation and an amorphous SiO2 shell with a thickness of about 1.6 nm, which approximately corresponds to one monolayer of the organic ligand (3-mercaptopropyl)-trimethoxysilane. It is shown that the Al-Ag2S/SiO2-ITO sandwich structure has a barrier-type CVC, determined by the Schottky barrier that appears at the boundary of the Ag2S QD flm and aluminum. The use of plasmon-exciton Ag2S/SiO2/Au in the formation of sandwich structures Al-Ag2S/SiO2/Au-ITO changes the CVC to linear, which apparently determines the ohmic type of conductivity and the absence of barriers in such a structure. It was found that, in contrast to the structure based on Ag2S/ SiO2 QDs, the Al-Ag2S/SiO2/Au-ITO structure has photosensitivity. It is concluded that decorating Ag2S/SiO2 QDs with Au nanoparticles increases the photosensitivity of sandwich structures.