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Abstract

GaSe<CS(NH 2) 2<C 14H 10>> clathrate with a hierarchical subhost<host<guest>> type architecture was formed under illumination and its electrically conductive properties were studied. The method of impedance spectroscopy studied the frequency behavior of the real and imaginary parts of the complex total impedance in the range of 10 -3-10 6 Hz. The measurements were performed under normal conditions, in a permanent magnetic field (220 kA/m), or under light illumination (for a standard solar spectrum AM 1.5 G total available power is 982 W/m 2). The structure of the impurity energy spectrum at the Fermi level was investigated by the method of thermostimulated discharge in the temperature range from 240 to 340 K. Using Jebol-Pollack theoretical approaches based on impedance spectra, the parameters of the impurity energy spectrum were calculated, such as the density of states at the Fermi level, the jump radius , the scatter of trap levels near the Fermi level and the real density of deep traps. As evidenced by studies, illumination during clathrate synthesis, forms an internal electret polarization, which leads to abnormal behavior of the photoresistive effect and to the appearance of the memristive effect. The imposition of a permanent magnetic field during the measurement of complex resistance leads to the appearance of quantum capacitance.
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Authors and Affiliations

Fedir Ivashchyshyn
1 2
ORCID: ORCID
Vitaliy Maksymych
2
ORCID: ORCID
Dariusz Calus
1
ORCID: ORCID
Dariya Matulka
2
ORCID: ORCID
Piotr Chabecki
1
ORCID: ORCID
Andrii Kunynets
2
ORCID: ORCID

  1. Czestochowa University of Technology, Al. Armii Krajowej 17, 42-200 Częstochowa, Poland
  2. Lviv Polytechnic National University, Bandera Str. 12, Lviv, 79013, Ukraine
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Abstract

In this work, we present findings on the syntheses and study of properties of InSe<PTHQ> nanohybrid. The introduction of guest component in GaSe matrix leads to an increase in inhomogeneities, which is clearly confirmed by the strengthening of the low-frequency horizontal branch of Nyquist diagrams. A constant magnetic field counteracts this effect and changes the behavior of the impedance hodograph at low frequencies to the opposite. Illumination leads to a colossal increase in quantum capacitance, which is clearly demonstrated in the Nyquist diagram. For the synthesized InSe<PTHQ> nanohybrid the interesting behavior of the current-voltage characteristic is reported. As a result of studies of the synthesized InSe<PTHQ> nanohybrid the effect of “negative capacity” is observed, the magnitude of which can be controlled by the electric field. Based on the constructed impedance model and proposed N-barrier model, the physical mechanisms of the investigated processes are suggested.
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Authors and Affiliations

Fedir Ivashchyshyn
1
ORCID: ORCID
Vitaliy Maksymych
2
ORCID: ORCID
Dariusz Calus
1
ORCID: ORCID
Myroslava Klapchuk
2
ORCID: ORCID
Glib Baryshnikov
3
ORCID: ORCID
Rostislav Galagan
3
ORCID: ORCID
Valentina Litvin
3
ORCID: ORCID
Piotr Chabecki
1
ORCID: ORCID
Ihor Bordun
1 2
ORCID: ORCID

  1. Czestochowa University of Technology, Al. Armii Krajowej 17, Czestochowa, 42-200, Poland
  2. Lviv Polytechnic National University, Bandera Str. 12, Lviv, 79013, Ukraine
  3. Bohdan Khmelnytsky National University, blvd. Shevchnko 81, 18031, Cherkasy, Ukraine

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