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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 Tc are critical to the performance of piezoelectric sensors. Here, we report a two-dimensional perovskite ferroelectric (4-aminotetrahydropyran)2PbBr4 (ATHP)2PbBr4 with a saturated polarization of 5.6 μC cm–2, high Tc of 503 K above that of BaTiO3 (BTO, 393 K), and extremely large g33 of 660.3 × 10–3 V m N–1 much beyond that of Pb(Zr,Ti)O3 (PZT) ceramics (20 to 40 × 10–3 V m N–1), more than 2 times higher than that of poly(vinylidene fluoride) (PVDF, about 286.7 × 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)2PbBr4 would be a competitive candidate for next-generation smart piezoelectric sensors in flexible devices, soft robotics, and biomedical devices.
Chen et al. (Wed,) studied this question.