(Pb,La)(Zr,Sn,Ti)O3 (PLZST) antiferroelectric (AFE) materials have been widely investigated for advanced pulsed power capacitors because of their fast charge-discharge rates and superior energy-storage capacity. For practical applications, require not only large energy density but also high efficiency, which are very difficult to achieve simultaneously. To address this problem, we herein investigate the properties PLZST AFE ceramics with a Sn content by considering that introduction can make...

Polarized-light detection in the deep ultraviolet solar-blind region is indispensable for optoelectronic applications. 2D hybrid perovskite ferroelectrics with inherent anisotropy and bulk photovoltaic effect (BPVE) have become a robust candidate this portfolio. We here report wide band-gap ferroelectric, (isobutylammonium)2 (methylamium)Pb2 Cl7 (1), which BPVE behaves as self-driving source polarized-light detection. It exhibits large dichroism ratio (≈15.7) superior BPVE-directed...

Ferro-pyro-phototronic (FPP) effect is a triple coupling of ferroelectricity, light-induced pyroelectricity, and photo-excitation, which holds bright promise for next-generation modern optoelectronic devices. However, except few oxides (e.g., BaTiO3 ), new FPP-active candidates remain extremely scarce due to the knowledge lacking on underlying role three components. By tailoring interlayered spacers, authors present series 2D cesium-based perovskite ferroelectrics, (A')2 CsPb2 Br7 (where...

Broadband photodetection has shown a great promise for diverse applications, while the realization of plateau photoresponse from ultraviolet (UV) to near-infrared (NIR) spectral region is very challenging. Herein, we exploit photoexcited pyroelectric effect in chiral hybrid perovskite, (N, N-dimethylcyclohexylammonium)PbBr3 (1), serving as new pathway drive broadband photoactivities. It room-temperature with large polarization ≈6.4 μC cm-2 and high figure-of-merits (FV =1.0×10-2 cm2 μC-1 FD...

Halide double perovskites have recently emerged as an environmentally green candidate toward electronic and optoelectronic applications owing to their non-toxicity versatile physical merits, whereas study on high-temperature antiferroelectric (AFE) with excellent anti-breakdown property remains a huge blank in this booming family. Herein, we present the first AFE of lead-free halide perovskites, (CHMA)2CsAgBiBr7 (1, where CHMA+ is cyclohexylmethylammonium), by incorporating flexible organic...

The photopyroelectric effect in ferroelectrics has shown great potential for application infrared detection and imaging. One particular subclass is broadband with dielectric bistability, which allows large pyroelectric figures-of-merit (FOMs). Herein, an improper high-Tc perovskite ferroelectric, (IA)2 (EA)2 Pb3 Cl10 (1, where IA isoamylammonium EA ethylammonium) presented, spontaneous polarization (Ps ) stems from the dynamic ordering of organic cations tilting distorted PbCl6 octahedra....

Broadband spectral photoresponse has shown bright prospects for various optoelectronic devices, while fulfilling high photoactivity beyond the material bandgap is a great challenge. Here, we present molecular pyroelectric, N-isopropylbenzylaminium trifluoroacetate (N-IBATFA), of which broadband photo-pyroelectric effects allow self-driven wide photodetection. As simple organic binary salt, N-IBATFA possesses large polarization (~9.5 μC cm-2), pyroelectric coefficient (~6.9 cm-2 K-1) and...

Abstract Metal thio(seleno)phosphates are renowned for their multifaceted physical characteristics and versatile applications, particularly in optoelectronics. In detection a low stable dark current is crucial, enhancing the sensitivity signal‐to‐noise ratio of detectors. Herein, van der Waals layered material has synthesized, CuInP 2 Se 6 . Despite its nanometric scale, 2D detector transcends conventional absorption inefficiencies tied to ultrathin materials. It delivers exceptional...

Antiferroelectric materials with an electrocaloric effect (ECE) have been developed as promising candidates for solid-state refrigeration. Despite the great advances in positive ECE, reports on negative ECE remain quite scarce because of its elusive physical mechanism. Here, a giant (maximum ΔS ∼ −33.3 J kg–1 K–1 ΔT −11.7 K) is demonstrated near room temperature organometallic perovskite, iBA2EA2Pb3I10 (1, where iBA = isobutylammonium and EA ethylammonium), which comparable to greatest...

Antiferroelectric (AFE) materials, featuring an antiparallel alignment of electric dipoles in the adjacent sublattices, are keeping a great promise toward solid-state refrigeration applications on account their electrocaloric (EC) effects. Although extensive studies have been performed inorganic oxide counterparts (e.g., PbZrO3 and AgNbO3), metal-free molecular AFE alternatives with above-room-temperature EC activities quite scarce but urgently demanded terms environmental issues. Herein, we...

2D Dion-Jacobson (DJ) phase hybrid perovskites have shown great promise in the photoelectronic field owing to their outstanding optoelectronic performance and superior structural rigidity. However, DJ lead-free double are still a virgin land with direct X-ray detection. Herein, we designed synthesized new layered perovskite of (HIS)2 AgSbBr8 (1, HIS2+ = histammonium). Centimeter-sized (18 × 10 5 mm3 ) single crystals 1 successfully grown via temperature cooling technique, exhibiting...

The bulk anomalous photovoltaic (BAPV) effect of acentric materials refers to a distinct concept from traditional semiconductor-based devices, which the above-bandgap photovoltage hints at promise for solar-energy conversion. However, it is still challenge exploit new BAPV-active systems due lacking knowledge on structural origin this concept. BAPV effects in single crystals 2D lead-free double perovskite, (BBA)2 CsAgBiBr7 (1, BBA = 4-bromobenzylammonium), tailored by mixing aromatic and...

Abstract Ferroelectric semiconductors represent an exciting branch of new‐generation optoelectronic devices. However, regarding severe polarization deterioration caused by leakage current, it is challenging to couple ferroelectricity and semiconductive properties in a single‐phase material. The first quadrilayered ferroelectric semiconductor 2D homologous perovskites, IA 2 Cs 3 Pb 4 Br 13 (IA = isoamylammonium), showing distinctive characteristics symmetry breaking at 351 K large 4.2 µC cm...

Two-dimensional (2D) hybrid perovskites with intrinsic attributes of structural and optical anisotropy are holding a bright promise for polarization-sensitive photodetection. However, studies on self-powered detection to quite weak polarized light remain scarce in this 2D family. By incorporating an aromatic spacer into the 3D cubic prototype, we have successfully assembled new perovskite polar motif, (FPEA)2(MA)Pb2I7 (FMPI, where FPEA is 4-fluorophenethylammonium MA methylammonium). Its...

Metal-free antiferroelectric materials are holding a promise for energy storage application, owing to their unique merits of wearability, environmental friendliness, and structure tunability. Despite receiving great interests, metal-free antiferroelectrics quite limited it is challenge acquire new soft candidates. Here, we have successfully exploited binary CMBrxI1-x CMBrxCl1-x solid solution as single crystals (0 ≤ x 1, where CM cyclohexylmethylammonium). A molecule-level modification can...

Pyroelectric materials with the capability of converting temperature changes into electrical signals have been widely used as essential elements for assembling integrated smart electronic detectors. Regarding conversion efficiency voltage output, however, it is significant but quite challenging to exploit new candidates large pyroelectricity figures-of-merit (FOMs) at room temperature. Herein, we acquired giant near-room-temperature pyroelectric FOMs in two-dimensional (2D) perovskite-type...

Molecular antiferroelectrics (AFEs) have taken a booming position in the miniaturization of energy storage devices due to their low critical electric fields. However, regarding intrinsic competitions between dipolar interaction and steric hindrance, it is challenge exploit room-temperature molecular AFEs with high efficiency. Here, we present new 2D hybrid perovskite-type AFE, (i-BA)2(FA)Pb2Br7 (1), which shows ultrahigh efficiencies at room temperature. Most strikingly, typical double P-E...

Two-dimensional (2D) hybrid perovskites take an emerging position in optoelectronics. Especially, ferroelectric crystals this family can be potentially used as polarized light detectors because photocurrent, induced by the bulk photovoltaic effect (BPVE), is function of intersection angle between polarization directions and spontaneous (Ps) direction crystals. Herein, exceptionally strong responses to are achieved (isopentylammonium)2CsPb2Br7 (1), which closely involved with Ps-directed...

The light-induced pyroelectric effect (LPE) has shown a great promise in the application of optoelectronic devices, especially for self-powered detection and imaging. However, it is quite challenging scarce to achieve LPE X-ray region. For first time, we report single-phase ferroelectric (NPA)2(EA)2Pb3Br10 (1, NPA = neopentylamine, EA ethylamine), adopting two-dimensional trilayered perovskite motif, which large spontaneous polarization ∼3.7 μC/cm2. Its ferroelectricity allows significant...

As a momentum-independent spin configuration, persistent texture (PST) could avoid relaxation and play an advantageous role in lifetime. Nevertheless, manipulation of PST is challenge due to the limited materials ambiguous structure-property relationships. Herein, we present electrically switchable new 2D perovskite ferroelectric, (PA)2 CsPb2 Br7 (where PA n-pentylammonium), which has high Curie temperature 349 K, evident spontaneous polarization (3.2 μC cm-2 ) low coercive electric field...

Abstract Circularly polarized light (CPL) detection has sparked the booming interest for versatile chiral‐optoelectronic and spintronic devices. For practical device applications, a large asymmetry factor is required to distinguish handedness of incent light. However, most chiral CPL active candidates, difference in optical density or absorption anisotropy quite subtle under illumination, resulting relatively low (usually ≤ 0.2). Up date, it remains extremely challenging achieve response...

Abstract Metal‐free molecular antiferroelectric (AFE) holds a promise for energy storage on account of its unique physical attributes. However, it is challenging to explore high‐curie temperature ( T c ) AFEs, due the lack design strategies regarding rise phase transition barriers. By renewing halogen substitution strategy, we have obtained series high‐ AFEs halogen‐substituted phenethylammonium bromides x ‐PEAB, =H/F/Cl/Br), resembling binary stator‐rotator system. Strikingly, p ‐site PEA +...

Birefringent crystals hold a significant position in optical and optoelectronic fields due to their capability control polarized light. Despite various chemical strategies devoted designing birefringent crystals, it remains challenge switch manipulate birefringence under physical stimuli. Here we present an unusual triple-state switching of 2D perovskite ferroelectric, (

Precise stacking of distinct two‐dimensional (2D) rigid slabs to build heterostructures has renewed the portfolio 2D materials, e.g., magic‐angle graphene, due emergence exotic physical properties. Recently, single‐crystal layered perovskites have emerged as an exciting branch, while it remains scarce achieve strong ferroelectricity in this new heterostructure family. Here, we present first ferroelectric perovskite single crystal, (EA3Pb2Br7)EA4Pb3Br10 (1, EA = ethylamine), by precisely...