The dielectric and electrical properties of bismuth oxide nanoparticles within organic network: The effect of temperature and the role of polarons

In this communication, we report the dielectric property of organic molecule functionalized bismuth oxide nanoparticles under different temperature and frequency condition. A large value of dielectric constant and a non-Debye type of relaxation phenomena has been witnessed due to the polaron induced polarization of the system. The frequency dependent electrical modulus of the material is discussed in the light of localized and non-localized relaxation process of the polaron. The AC-conductivity behaviour is modeled based on two different mechanisms, (a) polaron tunneling (at lower frequency) and (b) polaron hopping (at higher frequency). The organic-inorganic hybrid system also exhibited a unipolar resistive switching performance with a stable ON/OFF current ratio (∼10²) when used as an active material for a suitable device under a DC-bias.