Publication date: 2nd November 2020
Materials exhibiting ferroelectric and piezoelectric properties are of immense attention due to their promising technology applications and recently as mechanical energy harvesters. Our group is interested in the generation of phosphonium and ammonium cations for the halo-, oxo- and metallate-derived anions with ferroelectric properties and employ them to fabricate nanogenerator devices (Figure). We have initially shown that the PF6‒ salt of diphenyl diisopropyl phosphonium cation is ferroelectric in nature. Its various weight percentages composites with poly (dimethyl) siloxane yielded the first examples of all-organic mechanical energy harvesting devices.1 Use of tetrahedral anions such as BF4‒, ClO4‒ and IO4‒ ions gave rise to a family of ferro- and piezoelectric phosphonium salts with excellent ferroelectric and energy harvesting properties.2 Inspired by these findings, ferroelectric salts with A2MX4, AMX3 and A4(ML6) composition were prepared for the halogenometallate and pseudo-halogenometallate anions. Composites of these frameworks with commercial polymers such as PDMS and TPU were prepared and shown to yield high performances for their mechanical energy harvesting devices.3,4 Recently, using an ammonium cation containing metal-coordinating hydroxyl functionality, we have synthesized a zwitterionic ABX3 type perovskite that shows not only a high ferroelectric polarization but also very high nanogenerator device characteristics.5
This work was supported by SERB-India and ARMREB (DRDO)-India
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