MAGNETO- AND PHOTO-CONTROLLED SUPRAMOLECULAR CLATRATES BASED ON GALLIUM SELENIDE

Background . The development of modern nanoelectronics and sensor technologies necessitates the creation of new functional materials with tunable electrical, optical, and magnetic properties. One promising approach involves the formation of supramolecular clathrates based on layered A³B⁶ group semiconductors. This paper presents the results of electrophysical analysis of GaSe-based clathrate systems intercalated with a β-cyclodextrin<ferrocene> (β-CD<FC>) complex, synthesized both under normal conditions and in a constant magnetic field. Materials and Methods. A GaSe single crystal was used as the host matrix. The β-CD<FC> guest complex was intercalated under two different conditions: normal conditions and a constant magnetic field with a strength of 220 kA/m. Electrophysical properties were studied using impedance spectroscopy over a frequency range of 10⁻³–10⁶ Hz and thermally stimulated discharge analysis. Results and Discussion. Intercalation of β-CD<FC> into the expanded GaSe structure results in increased resistance in the low-frequency range and a non-monotonic behaviour of ReZ(ω). In samples synthesized in a magnetic field, a decrease in ReZ(ω) is observed, indicating a change in the electronic character of the guest complex from acceptor to donor type. Thermally stimulated discharge spectra reveal a transition from a quasi-continuous energy level distribution to a mini-zone structure, with homocharge relaxation dominating in the clathrate phase. Furthermore, samples synthesized in a magnetic field exhibit a fivefold increase in the magnetoresistive effect and a twofold enhancement in photosensitivity. Conclusion. The study demonstrates that intercalation of the supramolecular β-CD<FC> complex into the expanded GaSe matrix enables targeted modification of the impurity structure, resulting in changes in electrical conductivity and sensory behaviour of the clathrate. It was established that synthesis conditions, particularly the presence of a constant magnetic field, significantly influence the electronic nature of the guest component, the type of charge carriers, trap level parameters, and the manifestation of quantum effects during charge transport. Keywords : Intercalation, impedance spectroscopy, magnetoresistive effect, photoresistive effect, supramolecular complex, hierarchical architecture.