PDPh is distinguished by high chemical and heat resistance. The synthesis of this polymer is described in detail in the work of Salazkin S.N. The structural formula of PDPh is shown in Figure 1a. This is a well-known thermodynamic effect, which is often used to impart the desired properties to a poly-dimensional surface. In this regard, phthalide groups on the surface of the films form brushes when forming films from PDPh. PGs are large molecular groups with a relatively large dipole moiety. PGs are parts of a polymer monomer due to the lack of bonding of valence π electrons along the polymer chain. The biphenyl fragments are separated by phthalide groups (PGs). The monomeric link of its structure contains a skeletal part consisting of alternating biphenyl fragments ( Figure 1a). PDPh is not a conjugated polymer, unlike most electrically conductive polymers. In, such an explanation was impossible, since the contact of two dielectric polymer films with the same electron spectrum from the class of polyarylene phthalides–polydiphenylene phthalide (PDPh) was used. In particular, in it is assumed that a two-dimensional region is formed because of its analogy to semiconductor heterostructures and due to the contact phenomena resulting from the difference in the spectrum of the electronic states, tetrathiofulvalene (TTF) and 7,7,8,8-tetracyanoquinodimethane (TCNQ). However, the reasons for the appearance of new electronic properties along the interface of two organic dielectrics, and, are still debatable. Explanations of anomalous electronic properties (high conductivity and high mobility of charge carriers) were given on the basis of the quasi-two-dimensional (q2DEG) electron gas model. It was established that a two-dimensional region with electronic properties different from the volume can occur (or form) along the interface of two organic dielectrics. Thus, it is established that the transport of charge carriers occurs along the polymer–polymer interface at the structure parameters specified in this work. It is established that this is due to an increase in the mobility of the charge carriers and a decrease in the height of the potential barrier at the 3D metal–2D interface area. It was found that the doping of the polymer–polymer interface using Cu 2O particles strongly affects the transport of charge carriers in particular, the conductivity of the structure increases. Atomic force microscopy was used to control the thickness and uniformity of the samples. The electronic parameters of the polymer–polymer interface were studied using injection methods and volt-ampere characteristics. Spectral methods in the field of electronic absorption of copper oxide were used to control the island film. The purpose of this work is to study the current flow path in a multilayer sample by marking the polymer–polymer interface with a doping nanolayer of a Cu 2O island film. It is impossible to deny the possibility of transport on the surfaces of polymer films. There is no direct experimental evidence that the transport of charge carriers occurs along such an interface. It is important that it could be realized with non-conjugated polymers. One of the ways to increase the mobility of charge carriers can be the use of interface conductivity along the regions separating the two polymer films. However, the low mobility of charge carriers limits their use. Electrically conductive polymer materials are increasingly being used as electronic materials, for example, in thin-film transistors.
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