Lead‐Free Halide Perovskites for Direct X‐Ray Detectors

Advanced Science, Journal Year: 2023, Volume and Issue: 10(23)

Published: May 26, 2023

Abstract Lead halide perovskites have made remarkable progress in the field of radiation detection owing to excellent and unique optoelectronic properties. However, instability toxicity lead‐based greatly hindered its practical applications. Alternatively, lead‐free with high stability environmental friendliness thus fascinated significant research attention for direct X‐ray detection. In this review, current detectors based on is focused. First, synthesis methods including single crystals films are discussed. addition, properties these materials detectors, which can provide a better understanding designing satisfactory devices also presented. Finally, challenge outlook developing high‐performance perovskite provided.

Language: Английский

---

Single‐Source Evaporated High‐Quality Single‐Phase Cs₃Cu₂I₅ Scintillator Films for High Performance X‐Ray Imaging

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: March 29, 2024

Abstract Vacuum‐evaporated metal halides (MHs) scintillator thick films have received much attention in the X‐ray imaging field due to their excellent light yield and uniform large‐area preparation. However, inevitable heteromorphic homologs MHs (e.g., Copper‐based (Cu‐MHs): CsCu 2 X 3 ∖Cs Cu 5 ) change of film structural backbone will result spectral hybridization (phase purity), eventually detaches (lattice mismatches). Herein, a single‐source vacuum evaporation method prepare (≈10 µm) Cu‐MHs (as an example) scintillators is realized: 1) Presynthesis pure phase materials by solution with protective agent ensure purity without precise control component ratios process; 2) One‐shot formation avoids stress accumulation utilize longitudinal growth characteristics crystalline obtain crystal orientations better optical outputs. Finally, obtained comparable partially single‐crystal (53 983 photons MeV −1 resolution (14.1 lp mm partial template method. The detection system based on prepared exhibits good response speed linearity different radiation intensities exposure times. further drive application believed.

Language: Английский

---

Accommodative Organoammonium Cations in A‐Sites of Sb─In Halide Perovskite Derivatives for Tailoring BroadBand Photoluminescence with X‐Ray Scintillation and White‐Light Emission

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(8)

Published: Nov. 8, 2023

Abstract Broadband emissive perovskites are next‐generation materials for solid‐state lighting and radiative detection. However, white‐emitting generally synthesized by regulating B/X sites, while not enough attention is paid to the A‐site, which thought hardly affect band‐edge structures optoelectronic properties. Here, a series of Sb 3+ ‐doped In‐based 0D halide perovskite derivatives described with various organoammonium cations in A‐sites. Warm‐white light emitting across visible spectrum (450–850 nm), large Stokes shifts, high photoluminescence quantum yields easily tunable molecularly tailoring A‐site cations. These features enable yield up 60976 Photons/MeV as X‐ray scintillator, detection limit 90 nGy air /s that ≈60 times lower than medical requirement. It proved plays critical role determining degree distortion polyhedra, influences broadband self‐trapped exciton (STE) dominates emission process. Moreover, first time, via incorporation 2,6‐dimethylpiperazine, mixed strategy produces standard white‐light emission, originates from blue‐light yellow‐light related STE centers. foreseen this highlights expanded importance rethinking A‐sites perovskites.

Language: Английский

---

Lead-Free Halide Double Perovskite for High-Performance Photodetectors: Progress and Perspective

Materials, Journal Year: 2023, Volume and Issue: 16(12), P. 4490 - 4490

Published: June 20, 2023

Lead halide perovskite has become a promising candidate for high-performance photodetectors (PDs) due to its attractive optical and electrical properties, such as high absorption coefficient, carrier mobility, long diffusion length. However, the presence of highly toxic lead in these devices limited their practical applications even hindered progress toward commercialization. Therefore, scientific community been committed searching low-toxic stable perovskite-type alternative materials. Lead-free double perovskite, which is still preliminary stage exploration, achieved inspiring results recent years. In this review, we mainly focus on two types lead-free based different Pb substitution strategies, including A2M(I)M(III)X6 A2M(IV)X6. We review research prospects past three More importantly, from perspective optimizing inherent defects materials improving device performance, propose some feasible pathways make an encouraging future development photodetectors.

Language: Английский

---

Gd3+-sensitized rare earth fluoride scintillators for High-resolution flexible X-ray imaging

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 476, P. 146790 - 146790

Published: Oct. 20, 2023

Language: Английский

---

Biocompatible Metal-Free Perovskite Membranes for Wearable X-ray Detectors

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(13), P. 16300 - 16308

Published: March 21, 2024

Halide perovskites are emerging as promising materials for X-ray detection owing to their compatibility with flexible fabrication, cost-effective solution processing, and exceptional carrier transport behaviors. However, the challenge of removing lead from high-performing perovskites, crucial wearable electronics, while retaining superior performance, persists. Here, we present first time a highly sensitive robust detector utilizing biocompatible, metal-free perovskite, MDABCO-NH

Language: Английский

---

Radiochromic semiconductive MOFs with high sensitivity and fast photochromic responses for dual-mode X-ray direct detection

Inorganic Chemistry Frontiers, Journal Year: 2024, Volume and Issue: 11(11), P. 3316 - 3322

Published: Jan. 1, 2024

A radiochromic semiconductor detector for dual-mode direct X-ray detection, showing rapid color changes and high sensitivity upon exposure, is reported. This allows quickly capturing object information through visual inspection serves as an alternative means of detection.

Language: Английский

---

Chiral‐Achiral Cations Intercalation Induced Lead‐Free Chiral‐Polar Hybrid Perovskites Enable Self‐Powered X‐Ray and Ultraviolet–Visible–Near‐Infrared Photo Detection

Small, Journal Year: 2023, Volume and Issue: 20(12)

Published: Nov. 10, 2023

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 chiral‐polar perovskites, 2 R / S ‐PPA)BiI 2‐ ‐PPA )‐1‐Phenylpropylamine) are successfully obtained by introducing chiral aryl cations )‐1‐Phenylpropylamine. Compared to presents significant irradiation‐responsive bulk photovoltaic effect (BPVE) with an open circuit photovoltage 0.4 V, which enables it self‐powered X‐ray, UV–vis‐NIR photodetection. Specifically, device exhibits ultralow limit 18.5 nGy s −1 excellent stability. Furthermore, first achieves broad‐spectrum (377–940 nm) via light‐induced pyroelectric effect. This work sheds light on rational crystal reconstruction engineering design toward high‐demanded radiation

Language: Английский

---

Polar Alternating Cations Intercalated Hybrid Perovskite with Iodine‐Substituted Spacers Toward Efficient Passive X‐Ray Detection

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: July 30, 2024

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 ‐PPA)(IEA)PbBr 4 1‐ , )‐PPA = ‐1‐phenylpropylamine; IEA iodoethylamine), are constructed by integrating aromatic spacer ‐PPA iodine‐substituted IEA. Various intermolecular interactions, such as I···I, C─H···I, π···π introduced due introduction I‐substituted chain amines, effectively suppresses migration thus lead improved operational stability. The device along axis displays superior detection performance, relatively sensitivity an ultra‐low limit (LoD) 3.0 nGy s −1 making first ACI‐type material realizing Furthermore, also presents low dark drift exceptional irradiation This work provides thought using high‐performance

Language: Английский

---

Confinement‐Driven Bulk Photovoltaic in Lead‐Free Hybrid Perovskite for Self‐Powered X‐Ray Detection

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(19)

Published: May 16, 2024

Abstract Lead‐free hybrid perovskites (HPs) are considered as environmentally friendly photodetection materials. However, there few studies on self‐powered in lead‐free HPs, and most of them achieved through the introduction chiral ammonium cations induced bulk photovoltaic effect (BPVE). Notably, enantiomeric pure difficult to synthesize, quantity is small price high. Therefore, choosing achiral induce BPVE HPs crucial. Herein, 1,3‐ bis (aminomethyl)cyclohexane (1,3‐BMACH) exploited confinement (1,3‐BMACH)BiI 5 , then X‐ray detection successfully realized. Due large space zero‐dimensional (0 D) (MXD)BiI (MXD meta‐xylylenediammonium), not obvious, resulting disorderly arrangement MXD 2+ a centrosymmetry structure . Benefiting from photovoltage (1.0 V) under X‐ray, its single crystal devices exhibit ultra‐high sensitivity 170 µC Gy −1 cm −2 extremely low limit 49 nGy s mode, which almost surpassing low‐dimensional single‐phase at 0 V bias. This work has promoted application field detection.

Language: Английский

---