Abstract
Abstract An analytical approach has been applied to investigate the dielectric properties and ac conductivity behaviour of a new polymer nanocomposite (PNC) of polyvinyl alcohol (PVA) doped with nanocolloids of Se80Te15Bi5 glass over a frequency range of 100 Hz–5 MHz for temperatures ranging from 298 K to 448 K. An increase in dielectric constant and relaxation time for PNC has been seen as compared to pure PVA. The Cole-Cole model of relaxation shows good agreement with experimental data. The ac conductivity (σac) behaviour has been found to follow the Jonscher's power law Aωs. Prevailing mechanism of conduction has been confirmed to be correlated barrier hopping (CBH) type. The synthesized PNC has been used as an active layer in the fabrication of a memory device. Electrical characterization of the device has been done by current-voltage (I–V) and capacitance-voltage (C–V) measurements. The switching between high conductive (ON) and low conductive (OFF) states of the device may be attributed to charge trapping and de-trapping in Se80Te15Bi5 nanocolloids. The retention characteristic of the device, determined by capacitance-time (C-t) measurements indicates its good reliability and stability.
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