Trilayered Lead Chloride Perovskite Ferroelectric Affording Self-Powered Visible-Blind Ultraviolet Photodetection with Large Zero-Bias Photocurrent

Perovskite ferroelectrics, in which the spontaneous polarization
(Ps) is conducive to the separation of
photoexcited charge carriers, have shown great potential for self-powered
photodetection. Nevertheless, such self-powered ferroelectric photodetectors
are mostly dominated by traditional inorganic oxides and exhibit relatively
small zero-bias photocurrent, which limit their further application.
Herein, we present a wide-bandgap 2D trilayered lead chloride hybrid
perovskite ferroelectric, EA4Pb3Cl10 (1, EA = ethylammonium), which shows a notable Ps of ∼4.5 μC/cm2 and
a high Curie temperature (415 K) beyond that of BaTiO3 (393
K). Significantly, benefiting from the wide bandgap of 3.39 eV, a
self-powered visible-blind ultraviolet (UV) photodetector has been
successfully realized, with a zero-bias photocurrent as high
as 18.6 μA/cm2, which is nearly 2 orders of magnitude
larger than those of mostly conventional inorganic ferroelectrics.
As a pioneering study, this work offers an efficient approach for
exploring wide-bandgap perovskite ferroelectrics and will excavate
their application in the field of self-powered visible-blind UV photodetection.