Two-Dimensional Layered Perovskite Ferroelectric with Giant Piezoelectric Voltage Coefficient

Piezoelectric sensors that can work under various conditions with superior performance are highly desirable with the arrival of the Internet of Things. For practical applications, a large piezoelectric voltage coefficient g and a high Curie temperature T-c are critical to the performance of piezoelectric sensors. Here, we report a two-dimensional perovskite ferroelectric (4-minotetrahydropyran)(2)PbBr4 [(ATHP)(2)PbBr4] with a saturated polarization of 5.6 mu C cm(-2), high T-c of 503 K [above that of BaTiO3 (BTO, 393 K)], and extremely large g(33) of 660.3 x 10(-3) V m N-1 [much beyond that of Pb(Zr,Ti)O-3 (PZT) ceramics (20 to 40 x 10(-3) V m N-1), more than 2 times higher than that of poly(vinylidene fluoride) (PVDF, about 286.7 x 10(-3) V m N-1)]. Combined with the advantages of molecular ferroelectrics, such as light weight, easy and environmentally friendly processing, and mechanical flexibility, (ATHP)(2)PbBr4 would be a competitive candidate for next-generation smart piezoelectric sensors in flexible devices, soft robotics, and biomedical devices.