Lead-free halide double perovskites (HDPs) have sparked broad interest in developing "green" photodetectors; however, self-powered X-ray detectors this family remain elusive. Here, by exploiting the chirality-induced polar photovoltaic effect a chiral-polar 2D HDP, (R-MPA)4AgBiI8 (1, R-MPA = R-β-methylphenethylammonium), we successfully realized detection. The significant spontaneous electric polarization 1 gives it large photovoltage of 0.36 V, which drives separation and transport...

Abstract Lead halide perovskites have made great advance in direct X‐ray detection, however the presence of toxic lead and requirement high working voltages severely limit their applicability operational stability. Thus, exploring “green” lead‐free hybrid capable detecting X‐rays at zero bias is crucial but remains toughly challenging. Here, utilizing chiral R / S ‐1‐phenylpropylamine ( ‐PPA) cations, a pair 0D chiral‐polar perovskites, 2 BiI 5 1 ) are constructed. Their intrinsic...

Chiral hybrid perovskites combine the advantages of chiral materials and halide perovskites, offering an ideal platform for design circularly polarized light (CPL) detectors. The pyro-phototronic effect, as a special mechanism photoexcited pyroelectric signal, can significantly improve performance photodetectors, whereas it remains great challenge to achieve pyroelectricity-based CPL detection. In this work, chiroptical phenomena effect are combined in chiral-polar unprecedented...

Broadband photodetectors (PDs) with low detection limits hold significant importance to next-generation optoelectronic devices. However, simultaneously detecting broadband (i.e., X-ray visible regimes) and weak lights in a single semiconducting material remains highly challenging. Here, by alloying iodine-substituted short-chain cations into the 3D FAPbI

Abstract 2D chiral hybrid perovskites have recently emerged as outstanding semiconductor materials. However, most of the reported limited structural types and contain high levels toxic lead, which severely hinders their further applications. Herein, by using a mixed‐cation strategy, an unprecedented type lead‐free cluster‐based double perovskite derivatives are successfully obtained, [( R / S ‐PPA) 4 (IPA) 6 Ag 2 Bi I 24 ]·2H O ( 1‐R 1‐S ), n ‐BA) 2‐R 2‐S ) ‐PPA= –1‐phenylpropylamine;...

Abstract The anomalous photovoltaic (APV) effect in organic–inorganic hybrid perovskites (OIHPs) has attracted massive interest for developing high‐performance optoelectronic devices. However, exploring the ionizing radiation responsive APV remains blank, let alone its potential applications. Herein, unprecedented behavior a 1D lead‐free OIHP, (4‐AMP)BiI 5 ( ABI , 4‐AMP = 4‐(aminomethyl)pyridine) under X‐ray irradiation is reported, exhibiting large above‐bandgap bulk photovoltage of ≈10 V....

Abstract Ultraviolet (UV) photodetection is widely used in different fields, among which the with low detection limit has attracted strong interest due to broad applications various fields including military security, medical diagnosis, and chemical analysis. Recently, two‐dimensional (2D) hybrid perovskites are promising candidates for UV owing their superior semiconducting properties solution accessibility. Here, successfully realized by using high‐quality 2D perovskite single crystals,...

Halide hybrid perovskites are a kind of intriguing contenders for X-ray detection, and their low detection limits (LoDs) have played crucial part in safety inspection medical examination. However, there is still significant challenge manufacturing perovskite detectors with LoDs. Herein, attributed to the bulk photovoltaic effect (BPVE) Dion-Jacobson (DJ) type 2D halide polar structure (3-methylaminopropylamine)PbBr4 (1), self-powered limit successfully realized. Specifically, crystal-based...

Bulk photovoltaic effect, a promising optoelectronic phenomenon for generating polarized dependent steady-state photocurrent, has been widely applied in various photodetectors. However, incorporating stereochemically active lone pair to construct bulk photovoltage organic-inorganic hybrid perovskite (OIHP) is still elusive and challenging. Herein, (1.2 V) successfully achieved by introducing the stereo-chemically perovskitizer polar tri-layered perovskite, namely, (IBA)2 MHy2 Pb3 Br10 (1,...

Abstract Averaged over 4000 m in elevation, Tibetan Plateau (TP) functions as an important ecological security barrier China. Alpine ecosystems present a trend of overall improvement under the influence climate change and human activities, yet there are localized deteriorations. To improve function TP, large‐scale restoration projects (ERPs) have been carried out past 30 years, which could be classified into three stages, that is, Exploration (1989–2003), Rapid Growth (2004–2014),...

Chiral three-dimensional hybrid organic-inorganic perovskites (3D HOIPs) would show unique chiroptoelectronic performance due to the combination of chirality and 3D structure. However, synthesis chiral HOIPs remains a significant challenge. Herein, we constructed pair unprecedented halide perovskitoids (R/S-BPEA)EA6 Pb4 Cl15 (1-R/S) (R/S-BPEA=(R/S)-1-4-Bromophenylethylammonium, EA=ethylammonium), in which large cations can be contained big "hollow" inorganic frameworks induced by mixing...

Abstract Lead halide hybrid perovskites have made great progress in direct X‐ray detection and broadband photodetection, but the existence of toxic Pb demand for external operating voltage severely limited their further applications operational stability improvements. Therefore, exploring “green” lead‐free perovskite that can both achieve photodetection without is importance, remains challenging. Herein, using centrosymmetric (BZA) 3 BiI 6 ( 1 , BZA = benzylamine) as a template, pair...

Abstract 2D hybrid perovskites, with their high X‐ray absorption and extended carrier transport, present excellent promise for efficient direct detection. However, most of the current devices require external bias voltage, which results in need significant energy consumption severe ion migration, therefore, it is urgent to develop new types materials achieving passive Herein, two novel chiral polar alternating cations intercalation (ACI)‐type perovskite materials, named ( R / S...

Chiral metal halide perovskites (CMHPs) have recently shown great potential for direct circularly polarized light (CPL) detection. However, owing to the limited cutoff wavelength edge of these CMHPs, most detectors presented thus far are characterized only in ultraviolet and visible range; CMHPs that target at near-infrared (NIR) region still greatly desired. Here, we design a novel CMHP heterostructure, synthesized via solution-processed epitaxial growth crystalline 3D MAPbI3 on 2D chiral...

Abstract The stereochemical expression of the n s 2 lone pair significantly impacts symmetry breaking and corresponding photoelectric properties. However, hindered by symmetric octahedral configuration, Pb 2+ 6s in well‐conductive lead halide hybrid perovskites (LHHP) are normally stereo‐inactive, new approaches to activate still greatly desired. Herein, exploiting a perovskitizer tuning method, study successfully obtains stereo‐active polar perovskite PA MHy 3 Br 10 (PMPB, = n‐propylamine,...

Metal halide perovskite ferroelectrics combining spontaneous polarization and excellent semiconducting properties is an ideal platform for enabling self-driven X-ray detection. However, achievements to date have been only based on uniaxiality, which increases the complexity of device fabrication. Multi-axial ferroelectric materials multiple equivalent directions, making them potentially amenable multi-axial detection, but report these types still a huge blank. Herein, high-quality (BA)

Abstract The exceptional photophysical properties of 3D organic–inorganic lead halide hybrids (OILHs) endow their significant potential for usage in optoelectronics, which has sparked intense research on novel OILHs and associated applications. However, constructing new based large organic cations suffers from tough challenges due to the limitation Goldschmidt tolerance factor rule, let alone further explorations practical Herein, a brand‐new chloride hybrid, (1MPZ)Pb 4 Cl 10 ·H 2 O ( 1 ,...

Abstract Chiral halide perovskites have emerged as promising circularly polarized light sources due to their great potential applications in 3D displays, optical data storage, and communication devices. However, date, chiral with efficient blue luminescence (CPL) are scarcely unearthed. Herein, through formamidine engineering decrease lattice distortion, the first new types of corrugated 2D presented ( R / S )‐(BPEA)FAPbBr 4 ·H 2 O (2‐ ) (BPEA = 4‐bromophenylethylaminium, FA formamidinium)....

Using a half substitution strategy, pair of 2D chiral hybrid perovskites with alternating spacers, ( R / S -phenylpropylamine)(pentylamine)PbBr 4 , are derived from an achiral (pentylamine) 2 PbBr for circularly polarized light detection.

Abstract Circularly polarized light (CPL) detection has wide applications in many fields, where the anisotropy factor ( g Iph ) is an important indicator to characterize CPL performance. So far, materials with high have been reported, however, exploration of regulation still its infancy. Herein, two novel alternating chiral‐achiral cations intercalation‐type chiral hybrid perovskites (CHPs), named R / S ‐1‐phenylpropylamine)(propylamine)PbBr 4 (1‐ ), exhibit above room‐temperature (RT)...

Abstract Polar photovoltaic effect (PPE) has attracted great attention in regulating desired optoelectronic properties, which can be driven by order–disorder and displacive phase transitions. Bond‐switching is also a feasible method to induce PPE, but such investigation very rare. Lead‐halide hybrid perovskite (LHHP) an outstanding photodetection material; lead atoms possess rich coordination modes provide possibilities construct switchable bonds. Here, unique perovskitizer N─Pb...

Abstract The low‐toxic and environmentally friendly 2D lead‐free perovskite has made significant progress in the exploration of “green” X‐ray detectors. However, gap detection performance between them their lead‐based analogues remains a matter concern that cannot be ignored. To reduce this gap, shortening interlayer spacing to accelerate migration collection carriers is promising strategy. Herein, Dion‐Jacobson (DJ) double (4‐AP) 2 AgBiBr 8 ( 1 , 4‐AP = 4‐amidinopyridine) with an...

Metal halide perovskites have outperformed conventional inorganic semiconductors in direct X-ray detection due to their ease of synthesis and intriguing photoelectric properties. However, the operational instability caused by severe ion migration under a high external electric field is still big concern for practical application perovskite detectors. Here, we report 2D (BPEA)2PbI4 (BPEA = R-1-(4-bromophenyl)ethylammonium) with Br-substituted aromatic spacer capable introducing abundant...