CsPbX₃ Based X‐Ray Detectors

Advanced Optical Materials, Год журнала: 2023, Номер 11(19)

Опубликована: Июнь 15, 2023

Abstract In recent years, X‐ray detectors have been widely applied in industrial non‐destructive testing, medical diagnostics, scientific research, and so on. CsPbX 3 has become a dazzling star material because of its high absorption coefficient, low trap density, long carrier diffusion length, other excellent photoelectric characteristics. This review first presents the crystal structure then systematically introduces three single growth methods two quantum dot synthesis methods. Next, research progress detection is introduced for different types detector types. Finally, challenges development prospects are discussed.

Язык: Английский

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Surface Passivation toward Multiple Inherent Dangling Bonds in Indium Phosphide Quantum Dots

Inorganic Chemistry, Год журнала: 2024, Номер 63(14), С. 6396 - 6407

Опубликована: Март 26, 2024

Indium phosphide (InP) quantum dots (QDs) have become the most recognized prospect to be less-toxic surrogates for Cd-based optoelectronic systems. Due particularly dangling bonds (DBs) and undesirable oxides, photoluminescence performance stability of InP QDs remain improved. Previous investigations largely focus on eliminating P–DBs resultant surface oxidation states; however, little attention has been paid adverse effects In–DBs QDs. This work demonstrates a facile one-step peeling passivation treatment method both In- Meanwhile, may also effectively support encapsulation ZnSe shell. Finally, generated InP/ZnSe display narrower full width at half-maximum (fwhm) ∼48 nm, higher yields (PLQYs) ∼70%, superior stability. enlarges chemistry engineering consideration considerably promotes development efficient stable devices.

Язык: Английский

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Pseudohalide Anions Driven Structural Modulation in Distorted Tetrahedral Manganese(II) Hybrids toward Tunable Green‐Red Emissions

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 26, 2024

Mn(II)-based halides have recently garnered significant interest as emerging luminescence materials for diverse photonic applications. Generally, Mn(II) hybrids with tetrahedral coordination show green emission, however, ones octahedral give red emission. Herein, we design the synthesis of pseudohalide hybrids, (RPh

Язык: Английский

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Crystalline–Amorphous Heterojunction for a Metal Halides Single Crystals X‐Ray Detector with Substantially Increased Sensitivity

Laser & Photonics Review, Год журнала: 2023, Номер 18(1)

Опубликована: Окт. 2, 2023

Abstract Ion migration‐induced noise is the main limiting factor for metal halides (MHs) single crystals (SCs) X‐ray detectors, and heterostructure design most efficient method to overcome this puzzle. However, conventional stepwise solution or heteroepitaxial greatly limited by SCs secondary dissolution lattice parameters matching. Here, simple universal crystalline–amorphous heterojunction developed that proves be extremely effective in suppressing noise. MAPbBr 3 are first chosen as representatives form heterojunctions with amorphous MTP 2 MnBr 4 melting method, related device shows an enhanced response significant suppression. Computational experimental results demonstrate gradient energy levels formation improved ion migration responsible this. Finally, optimized a low dark current (reduced from ≈1000 ≈0.12 nA), ultra‐high sensitivity (10 569 µC Gy air −1 cm −2 ), lower detection limit (82.64 nGy s negligible performance deterioration at total radiation dose of ≈17 000 mGy . Moreover, six other selected verify effect heterojunctions, all which show excellent sensitivity, proving its versatility. Hence, it believed work will give strong impetus develop sensitive MHs detectors.

Язык: Английский

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Hybrid Perovskite Molecular Rotor Ferroelastic Semiconductor Constructed by Supramolecular Assembly

Crystal Growth & Design, Год журнала: 2024, Номер 24(13), С. 5411 - 5416

Опубликована: Июнь 18, 2024

Organic–inorganic hybrid ferroelastic materials have emerged as promising candidates for various applications such mechanical switches, signal conversions, and memory because of their convenient processing, structural flexibility, environmental friendliness. Here, we reported a supramolecular assembly perovskite (15-crown-5·NH4)2TeCl6 (1) semiconductor containing stator ammonium rotor 15-crown-5 cations TeCl6 an anionic part. This shows phase transition dielectric switch induced by the motions crown rotor. In addition, it X-ray detection response with clear switching ratio photocurrent 0.011 dark current 0.001 nA cm–2. study reveals advantages strategy in discovering novel molecular provides new avenue to explore functional materials.

Язык: Английский

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Tailored molecular for ultra-stability and biocompatible pseudohalide metal-free perovskite towards X-ray detectors with record sensitivity

npj Flexible Electronics, Год журнала: 2024, Номер 8(1)

Опубликована: Июль 28, 2024

Abstract The emerging pseudohalide metal-free perovskite (pseudohalide–MFPs) X-ray detector caters to the demands of timely mobile diagnosis owing its lightweight, flexibility, and cost-effectiveness. However, performance these devices is severely limited by poor absorption, ultra-wide band gap, relative instability, their unknown biotoxicity. Herein, we construct heavy atom covalent bonds (C–Br/Cl) on A-site organic cation reinforce component coordination modulate absorption gap in pseudohalide–MFPs further enhance stability. Molecular dynamics simulations demonstrate that introduction halogen atoms can strengthen hydrogen bonding interactions, thereby improving between different components. resultant (MDABCOBr)–NH 4 (BF ) 3 (MDABCO = N-methyl-N’-diazabicyclo[2.2.2]octonium) single crystal significantly increases cross-section crystalline density (from 1.728 1.950 g cm −3 ), synergistically realizes nature modulation 7.4 5.5 eV) enhanced ionic migration inhibition (628 meV) with optimized As such, our detectors realized a sensitivity 2377 μC Gy air −1 −2 , an ultralow detection limit 50.1 nGy s impressive operation Moreover, cytotoxicity assay confirmed compatibility perovskite. Finally, within this framework, successfully fabricate -based flexible device create ideal vitro wearable detection.

Язык: Английский

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Transparent Perovskite Wafers via Nanocrystals Ordered Coalescence Toward Sensitive and Stable X‐Ray Detection and Imaging

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Авг. 5, 2024

Abstract Metal halide perovskite wafers have shown significant potential in large‐area X‐ray detection and imaging. However, a distinct difference optical transparency between state‐of‐the‐art single crystals indicates the inferior crystal quality of wafers, which limits performance stability wafer‐based detectors. Here, nano‐sized MAPbBr 3 powders are utilized to fabricate dense by low‐temperature hot‐pressing with high above 60% within 552–800 nm wavelength range. Adjacent nanocrystals assemble following ordered coalescence mechanism, resulting exclusion nanoscopic pores crystallographic reorientation. The transparent detectors achieve an impressively sensitivity 1.14 × 10 5 µC Gy air −1 cm −2 low limit 149 nGy s , is superior opaque wafer (5.64 4 316.7 ) comparable single‐crystal Moreover, demonstrate uniformity outstanding under continuous irradiation total dose up 5.9 equaling 29 500 times posteroanterior chest examinations. lead clear imaging performance.

Язык: Английский

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Exploring Aqueous Solution‐Processed Pseudohalide Rare‐Earth Double Perovskite Ferroelectrics toward X‐ray Detection with High Sensitivity

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(49)

Опубликована: Авг. 29, 2024

Abstract Three‐dimensional (3D) pseudohalide rare‐earth double perovskites (PREDPs) have garnered significant attention for their versatile physical properties, including ferroelectricity, ferroelasticity, large piezoelectric responses, and circularly polarized luminescence. However, potential X‐ray detection remains unexplored, the low Curie temperature ( T C ) limits performance window PREDP ferroelectrics. Here, by applying chemical regulation strategies involving halogen substitution on organic cation Rb/Cs to [( R )‐M3HQ] 2 RbEu(NO 3 6 )‐M3HQ=( )‐N‐methyl‐3‐hydroxylquinuclidinium] with a of 285 K, novel 3D ferroelectric )‐CM3HQ] CsEu(NO )‐CM3HQ=( )‐N‐chloromethyl‐3‐hydroxylquinuclidinium] are successfully synthesized, which reaches 344 K. More importantly, such strategy endowed notable capabilities. Centimeter‐sized single crystals fabricated from aqueous solutions demonstrated sensitivity 1307 μC Gy air −1 cm −2 detectable dose rate 152 nGy s , highest reported hybrid perovskite detectors. This work positions PREDPs as promising candidates next generation eco‐friendly optoelectronic materials also offers substantial insights into interaction between structure, composition, functionality in materials.

Язык: Английский

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Metal-Free Hydrazinium Halide Perovskitoid Single Crystals for X-ray Detection

Nano Letters, Год журнала: 2023, Номер 23(21), С. 9972 - 9979

Опубликована: Окт. 20, 2023

Metal-free perovskitoids (MFPs) with N2H5+ as B-site component possess higher crystal density and hydrogen bonding networks have been recently expanded into X-ray detection. However, research on this material is in its infancy lacks an understanding of the function halide components physical properties device performance. Here, N2H5-based MFP single crystals (SCs) different halides are fabricated, influence structure, band nature, charge transport characteristics, final performance actively explored. Based theory experiments, tolerance factor octahedral jointly determine composition. Further, electronegativities ionic radii also affect distortion energy bending, further influencing carrier Finally, a sensitivity 1284 μC Gyair-1 cm-2 low detection limits (LoD) 5.62 μGyair s-1 were obtained by Br-based due to superior properties.

Язык: Английский

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Against the Wallach's Rule Through Rational Design of Metal‐Free Chiral Perovskites Toward Efficient Red Circularly Polarized Phosphorescence

Angewandte Chemie International Edition, Год журнала: 2025, Номер unknown

Опубликована: Март 10, 2025

The potential applications of circularly polarized phosphorescent materials in chiroptical devices have attracted considerable interest. Nevertheless, the design efficient near-infrared/red pure organic remains a significant challenge, largely due to limitations imposed by energy-gap law and Wallach's rule. In this study, chiral metal-free perovskite strategy is employed overcome these restrictions. introduction cyclohexylenediammonium cations as A-site perovskites results generation an phosphorescence at 637 nm with lifetime up 227.98 µs. Furthermore, photoluminescence quantum yield (PLQY) can reach 71.22%, accompanied anisotropy factor 9.8 × 10-3. figure merit (FM = PLQY× |glum|) 6.98 10-3, which highest value achieved among all materials. work proposes unique achieve highly based on non-conjugated luminophores, accomplished combining superior optical electronic properties chirality rational molecular design.

Язык: Английский

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