Abstract— XRD, SEM, EDX investigations as well as wide temperature (T = 5–300 K) photoluminescence measurements of GaSe single crystals intercalated from the melt of RbNO3 ferroelectric salt at various temperatures and exposure times are performed in this work. Intercalation by this method results in GaSe matrix fragmentation by separate polycrystals 1 mm in size which consist of bulk GaSe segments (with sizes up to 50.0 mkm) and veins of RbNO3 ferroelectric salt with thickness reaching 2–3 mkm. Within the GaSe segments are inclusions of nano-sized phases consisting of RbNO3 salt whose diameter does not exceed 120 nm. It has been shown that the creation of GaSe<RbNO3> hybrid structure has an insignificant influence on the optical properties of GaSe matrix, since in the photoluminescence spectra of GaSe<RbNO3> at T = 300 K one can observe emission of free excitons which is typical for GaSe single crystals. The electrical investigations performed indicate that the intercalated GaSe<RbNO3> or GaSe<KNO3> are capable of accumulating electric energy, and prototypes of supercapacitors based on them possess: specific long-time energy 105 kJ/kg and resource of cycles > 106.
Keywords— Layered crystal, GaSe, intercalation, ferroelectric, supercapacitors.
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