Chiroferromagnetic Quantum Dots for Chiroptical Synapse (ChiropS)

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Abstract Optoelectronic devices using circularly polarized light (CPL) offer enhanced sensitivity and specificity for efficient data processing. There is a growing demand CPL sensing mediums with strong optical activity, stability sensitivity, multiple transition bands, environmental compatibility. Here, defect‐engineered chiroferromagnetic quantum dots (CFQDs) are used as new type of material. By inducing amorphization defects through chiral molecules, CFQDs high unpaired electron density, atomic structural chirality, amplified chiroptical exciton bands developed. enable nonlinear, long‐term plastic behavior linear input, acting in situ noise filters that reduce by over 20%. Additionally, provide nine times higher integration photon polarization wavelength distinctions, paving the way next‐generation processors improved energy efficiency, integration, reduced retention time.

Language: Английский

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Bulk Photovoltaic Effect in Chiral Layered Hybrid Perovskite Enables Highly Sensitive Near-Infrared Circular Polarization Photodetection

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(17), P. 6591 - 6597

Published: Aug. 25, 2023

A bulk photovoltaic effect (BPVE), as a form of optoelectronic conversion phenomenon mostly appearing in polar materials, has shown tremendous potential applications solar harvesting and photodetectors. However, materials exhibiting near-infrared (NIR) BPVEs to meet the growing requirement night vision modern informational technology are scarce urged be developed. Recently discovered hybrid perovskites (PHPs) with various chemical structural tunabilities provide opportunities obtain desired properties. Herein, by precisely regularizing arrangement PbI6 octahedra, chiral PHPs [R/S-BEPA]2FAPb2I7 (RBFP SBFP, space group P21, R/S-BEPA = (R/S)-1-(4-bromophenyl)ethylammonium, FA formidinum) state-of-the-art bandgap (Eg 1.45 eV) were designed synthesized successfully. Benefited from structures narrow bandgap, crystal devices SBFP exhibit Vis–NIR an optimized open circuit voltage short current up 0.91 V 14 μA cm–2, respectively. Moreover, boosted BPVE, broad spectrum (from 405 785 nm) circularly polarized light (CPL) detection high asymmetry factors 0.376 based on was realized. Notably, is first single compound PHP capable directly detecting NIR CPL signals without external absorber or specific laser source. This work provides ideal platform for having deeper understanding interplay between BPVE optical helicity region future.

Language: Английский

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Self-Powered Circularly Polarized Light Detection Enabled by Chiral Two-Dimensional Perovskites with Mixed Chiral–Achiral Organic Cations

ACS Nano, Journal Year: 2024, Volume and Issue: 18(22), P. 14605 - 14616

Published: May 21, 2024

Direct detection of circularly polarized light (CPL) holds great promise for the development various optical technologies. Chiral 2D organic-inorganic halide perovskites make it possible to fabricate CPL-sensitive photodetectors. However, selectively detecting left-handed (LCP) and right-handed (RCP) remains a significant challenge. Herein, we demonstrate greatly enhanced distinguishability photodiode-type CPL photodetectors based on chiral with mixed aryl (R)-(+),(S)-(-)-α-methylbenzylammonium (R,S-MBA) achiral alkyl n-butylammonium (nBA) cations. The (R,S-MBA0.5nBA0.5)2PbI4 exhibit 10-fold increase in circular dichroism signals compared (R,S-MBA)2PbI4 perovskites. mixed-cation self-powered capabilities specific detectivity 2.45 × 1012 Jones at 0 V bias. Notably, these devices show high (gres) factors -0.58 +0.54 perovskites, respectively, surpassing performance (R-MBA)2PbI4-based by over 3-fold setting record detectors n = 1

Language: Английский

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Giant chiral amplification of chiral 2D perovskites via dynamic crystal reconstruction

Science Advances, Journal Year: 2024, Volume and Issue: 10(34)

Published: Aug. 21, 2024

Chiral hybrid perovskites show promise for advanced spin-resolved optoelectronics due to their excellent polarization-sensitive properties. However, chiral developed date rely solely on the interaction between organic ligand cations exhibiting point chirality and an inorganic framework, leading a poorly ordered short-range system. Here, we report powerful method overcome this limitation using dynamic long-range organization of guided by incorporation dopants, which induces strong interactions dopants cations. The additional interplay with reorganizes morphological crystallographic properties perovskites, notably enhancing asymmetric behavior 2D more than 10-fold, along highest dissymmetry factor photocurrent (

Language: Английский

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High discrimination ratio, broadband circularly polarized light photodetector using dielectric achiral nanostructures

Light Science & Applications, Journal Year: 2024, Volume and Issue: 13(1)

Published: Sept. 27, 2024

Language: Английский

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Chiral organic semiconducting materials for next-generation optoelectronic sensors

Device, Journal Year: 2023, Volume and Issue: 1(5), P. 100176 - 100176

Published: Nov. 1, 2023

Language: Английский

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Ligand‐Assisted Self‐Assembly of 3D Perovskite Nanocrystals into Chiral Inorganic Quasi‐2D Perovskites (n = 3) with Ligand‐Ratio‐Dependent Chirality Inversion

Small, Journal Year: 2023, Volume and Issue: 19(36)

Published: May 10, 2023

Chiral inorganic quasi-2D perovskites are prepared by self-assembling 3D in solution for the first time. The perovskite synthesized is a pure-phase with = 3 and periodically arranged, which big breakthrough perovskites. With individual chiral CsPbBr3 nanocrystals (NCs) assemble into perovskite, g-factor significantly improved (≈5 × 10-3 ). In addition, chiroptical activity of explored to be lateral size increasing. stage assembly, optical increased due size-dependent activity, while changes later stages attributable morphology. Interestingly, chirality inversion found correlated number ligands. It believed that different conformers ligands caused steric hindrance original ligand oleylamine result opposite circular dichroism (CD) polarities. phenomenon universal, regardless choice This work opens up new path synthesis provides more opportunities modulation activity.

Language: Английский

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Chiral 2D and quasi-2D hybrid organic inorganic perovskites: from fundamentals to applications

Chemical Communications, Journal Year: 2024, Volume and Issue: 60(70), P. 9310 - 9327

Published: Jan. 1, 2024

Chiral 2D and quasi-2D hybrid organic-inorganic perovskites (HOIPs) are emerging as promising materials for a variety of applications principally related to optoelectronics spintronics, thanks the combined benefits deriving from both chiral cation perovskite structure. Since its recent birth, this research field is tremendously growing, focalizing on chemical composition tuning unveil influence functional properties well developing devices practical applications. In review, we focused HOIPs, firstly providing an overview their chiroptical behaviour followed by potential exploitation in investigated so far various applicative fields.

Language: Английский

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Chiral Perovskite Heterostructure Films of CsPbBr₃ Quantum Dots and 2D Chiral Perovskite with Circularly Polarized Luminescence Performance and Energy Transfer

ACS Nano, Journal Year: 2024, Volume and Issue: 18(33), P. 22334 - 22343

Published: Aug. 9, 2024

This work reports the synthesis of chiral perovskite heterostructure films by combining a two-dimensional (2D) (R-/S-MBA)2PbI4 with CsPbBr3 quantum dots (QDs). The as-synthesized exhibit obvious circularly polarized luminescence (CPL) properties, even though pure 2D cannot present photoluminescence. It indicates that chirality excited state QDs originates from perovskite. circular polarization-resolved transient absorption (TA) spectra further demonstrate CPL response energy transfer between layer and suppression spin relaxation, which induces imbalance population states in layer. In addition, photoluminescence (PL), dichroism (CD), these can be controlled varying thickness component layer, demonstrates anion exchange tune chemical composition optoelectronic properties due to low bonding difference them decrease strain within reduce radiative recombination lifetime. provides guidance for perovskites strong insight into origination CPL.

Language: Английский

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Regulating Circularly Polarized Light Detection via Polar‐Phase Transition in Alternating Chiral‐Achiral Cations Intercalation‐Type Hybrid Perovskites

Advanced Science, Journal Year: 2023, Volume and Issue: 11(6)

Published: Dec. 27, 2023

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) polar‐phase transition, which greatly regulates value. The 1‐ 0.04 high‐temperature phase non‐polar P 2 1 by applying 5 V bias, interestingly, temperature decrease, value low‐temperature polar gradually increases (0.22@360K, 0.40@340K, 0.47@320K), and finally reaches a maximum 0.5 at RT. Such not only highest among 2D CHPs date, but presents 12.5‐fold amplification compared 0.04. Further, this rare phenomenon should be attributed built‐in electric field induced photovoltaic effect, sheds on further obtaining large .

Language: Английский

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