This paper contains the following concepts: definitions about polaron, concepts of polarons, large polaron, small polaron, and development of quantum theory for electron self-action potential in a system consisting of three contact different semi-conductor thin layers, finding polaron potential energy, and studying the case in which an electron is located inside the thin layer or on its surface. Studying the effect of dielectric anisotropy of layers on electron-(hole) potential energy in the above mentioned thin layers.