Organic molecule stabilized bismuth iodide nanoparticle: A hybrid system with multifunctional physical properties
An organic-inorganic hybrid system of aniline stabilized bismuth iodide nanoparticle (ABI) was synthesized and investigated for dielectric properties, AC-conductivity, polarization hysteresis, and non-volatile memory performances. The X-ray diffraction result indicates the single-phase crystalline nature of the nanoparticles and the microscopic image shows the homogeneous distribution of the bismuth iodide nanoparticle within the organic matrix. The material has archived a moderate dielectric performance via interfacial polarization mechanism. The decrease in dielectric constant with frequency is correlated to the carrier concentration and diffusion potential, and the behaviour revealed that the halide ion mediated polaron migration control the overall relaxation and conductivity properties of the material. Octahedral distortion of bismuth iodide, through halide ion migration, induced a hysteresis loop in polarization-electric field (P-E) characteristics. The device fabricated with aniline stabilized bismuth iodide nanoparticle exhibited space-charge limited current and trap assisted tunneling mechanism for the charge transport process. The non-volatile property reveals that the device has the ability to store binary information and have potential for memory application.