Achievement of a giant piezoelectric coefficient and piezoelectric voltage coefficient through plastic molecular-based ferroelectric materials

Abstract

•Report a molecule-based ferroelectric with large d33 and g33 •Be helpful to design molecule-based materials with large d33 and g33 •Built a piezoelectric generator generating 38.1 V Voc and 1.6 μA Isc at 1 N and 3 Hz Piezoelectric generators (PEGs) converting mechanical energy into electricity are regarded as a promising power source for self-powered systems. Although piezoelectric materials with large piezoelectric (d33) and piezoelectric voltage (g33) coefficients are the key to their practical applications, how to obtain such materials is still a great challenge. Taking advantage of the well-defined structure of molecule-based compounds, this work demonstrates for the first time that both a large d33 (∼ 226 pC N−1) and g33 (∼1,318 × 10−3 V m N−1) can be achieved in a plastic molecule-based ferroelectric [(CH3)3NCH2Cl][GaCl4] (1). Significantly, PEGs built using 10 wt % 1 and polydimethylsiloxane (PDMS) exhibit excellent mechanical durability stability and possess good performance. Thus, the present work is not only very helpful to the rational design of piezoelectric materials with large d33 and g33 but also lays a solid foundation for the practical application of PEGs. Piezoelectric generators (PEGs) converting mechanical energy into electricity are regarded as a promising power source for self-powered systems. Although piezoelectric materials with large piezoelectric (d33) and piezoelectric voltage (g33) coefficients are the key to their practical applications, how to obtain such materials is still a great challenge. Taking advantage of the well-defined structure of molecule-based compounds, this work demonstrates for the first time that both a large d33 (∼ 226 pC N−1) and g33 (∼1,318 × 10−3 V m N−1) can be achieved in a plastic molecule-based ferroelectric [(CH3)3NCH2Cl][GaCl4] (1). Significantly, PEGs built using 10 wt % 1 and polydimethylsiloxane (PDMS) exhibit excellent mechanical durability stability and possess good performance. Thus, the present work is not only very helpful to the rational design of piezoelectric materials with large d33 and g33 but also lays a solid foundation for the practical application of PEGs.