The role of organic cations as additives in photovoltaic perovskites DOI

Alejandra T. Cadillo-Martínez,

Alejandra Vargas-Calderon,

Arián Espinosa-Roa

et al.

Physical Chemistry Chemical Physics, Journal Year: 2023, Volume and Issue: 25(29), P. 19706 - 19712

Published: Jan. 1, 2023

The design of additives for perovskite-based solar cells seeks to improve the balance between stability and power conversion efficiency. Organic molecules such as theophylline, theobromine caffeine (xanthines) have proved be a good engineering solution. As an alternative, we present first-principles study use organic cations additives. These are obtained when free nitrogen imidazole unit aforementioned is quaternized. We found that interaction MAPbI3 perovskite surface stronger compared molecules. Pb-O I-H bonds interface dominated these interactions. In addition, showed higher charge transfer through shallow states harmless could carrier mobility. characteristics show quaternized xanthines should promising additive materials in photovoltaic applications.

Language: Английский

Two-Dimensional Metal Halides for X-Ray Detection Applications DOI Creative Commons

Yumin Li,

Yutian Lei, Haoxu Wang

et al.

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: May 20, 2023

Abstract Metal halide perovskites have recently emerged as promising candidates for the next generation of X-ray detectors due to their excellent optoelectronic properties. Especially, two-dimensional (2D) afford many distinct properties, including remarkable structural diversity, high energy, and balanced large exciton binding energy. With advantages 2D materials perovskites, it successfully reduces decomposition phase transition perovskite effectively suppresses ion migration. Meanwhile, existence a hydrophobic spacer can block water molecules, thus making obtain stability. All these attracted much attention in field detection. This review introduces classification summarizes synthesis technology performance characteristics direct detector, briefly discusses application scintillators. Finally, this also emphasizes key challenges faced by practical presents our views on its future development.

Language: Английский

Citations

65
Organic Cation Design of Manganese Halide Hybrids Glass toward Low‐Temperature Integrated Efficient, Scaling, and Reproducible X‐Ray Detector DOI
Youkui Xu, Zhenhua Li, Guoqiang Peng

et al.

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(13)

Published: April 5, 2023

Abstract Zero‐dimensional (0D) structure‐based manganese metal halides (MHs) are believed to be the most promising candidates for next‐generation X‐ray scintillators due their intense radioluminescence and environmental friendliness. However, low‐temperature (<180 °C), large‐area integration with more efficient detection remains a tremendous challenge. Herein, from perspective of cation (ionic liquids) structure design, basic physical parameters 0D MHs regulated. And calculations experimental results demonstrate larger‐size cations that induce lower melting temperatures, larger exciton‐binding energies, ion migration energy, tunable hardness, which desirable MHscintillators. As result, champion materialHTP 2 MnBr 4 is achieved as glassy transparency wafer by (165 °C) melt‐quenching. Its application imaging features high spatial resolution (17.28 lp mm −1 ), scalability (>30 × 30 cm strong coupling force. Furthermore, HTP glass reproducible properties demonstrates light yield (38 000 photon MeV excellent irradiation stability, low limit (0.13 µGy s ). The authors believe this work will provide guidance MHscintillators further commercial applications.

Language: Английский

Citations

45
PF6− Pseudohalides Anion Based Metal‐Free Perovskite Single Crystal for Stable X‐Ray Detector to Attain Record Sensitivity DOI
Zhizai Li, Zhenhua Li, Guoqiang Peng

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(25)

Published: March 27, 2023

Metal-free perovskites (MFPs) possess excellent photophysical properties of while avoiding the introduction toxic metal ions and organic solvents, have been expanded to X-ray detection. However, iodine-based high-performance MFPs are tended oxidation, corrosion, uncontrolled ion migration, resulting in poor material stability device performance. Herein, strongly electronegative PF6- pseudohalide is used fabricate large-size MDABCO-NH4 (PF6 )3 (MDBACO = methyl-N'-diazabicyclo[2.2.2]octonium) single crystals (SCs) for solving problems iodine ions. After pseudohalides, Coulomb interaction hydrogen bonding strength enhanced alleviate ion-migration problems. Moreover, combined with theoretical calculations, pseudohalides increase barrier, affect contribution its components energy band a broadening bandgap. Meanwhile, improved physical properties, such as large activation ionic high resistivity, low current drift, further expand application low-dose sensitive Finally, detector based on SCs achieves sensitivity 2078 µC Gyair-1 cm-2 (highest among metal-free SCs-based detectors) lowest detectable dose rate (16.3 nGyair s-1 ). This work has selection detectors somewhat advanced development devices.

Language: Английский

Citations

40
Sequential Vacuum Evaporated Copper Metal Halides for Scalable, Flexible, and Dynamic X‐Ray Detection DOI

Fu Qiu,

Guoqiang Peng, Youkui Xu

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(36)

Published: May 8, 2023

Abstract Copper metal halides have emerged as a strong contender in the scintillator field due to self‐trapped excitons (STEs) mechanism. However, their development has been hindered by preparation process. Single crystals long growth cycles and cannot achieve large areas flexibility. Quantum dots low yield can easily cause chemical pollution, thickness of films prepared spin coating be controlled. To address these challenges, new method for preparing Cs 3 Cu 2 Cl 5 using sequential vacuum evaporation is developed. This allows successful large‐area (≈100 cm ) flexible films. The STEs mechanism gives it unique properties such Stokes shift that reduces self‐absorption effects, wide full width at half‐maximum improves coupling with photodiodes. Therefore, applied X‐ray imaging light ≈30 000 photons MeV −1 , spatial resolution over 10 lp mm detection limit below 0.8 µGy air s . In addition, film enables effective dynamic clear on non‐planar objects. It also exhibits good resistance harsh environments, maintaining performance after 150 days. believed provides an important idea scintillators.

Language: Английский

Citations

29
Revolutionizing healthcare materials: Innovations in processing, advancements, and challenges for enhanced medical device integration and performance DOI
Alok Bihari Singh,

Chandni Khandelwal,

G.S. Dangayach

et al.

Journal of Micromanufacturing, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 12, 2024

Cutting-edge materials have transformed the fabrication of medical devices and implants. However, processing used to create these impacts their mechanical, physical, biological characteristics, preventing effective integration. This study is intended provide a detailed analysis healthcare techniques, stressing healthcare-specific material requirements, such as biocompatibility, mechanical strength, corrosion resistance, stabilizability, bioactivity, followed by classifying methods “ordinary” “edge-cutting” methods. The consequences each on material, well benefits, drawbacks, recent developments technique, are also aimed be concluded. explore how process factors affect product qualities. articles collected from Scopus Web Science databases using search strings “Advance Material,” “Material Processing,” “Healthcare,” “HealthCare Application.” assessment selected literature has been done in accordance with objectives. emphasizes quality assurance regulatory compliance need for assurance, characterization, testing Processes polishing, etching, coatings improve biocompatibility reduce infection risk, according findings. It was concluded that cutting-edge additive manufacturing (3D printing) electrospinning exact control over composition, structure, porosity, making them ideal many clinical applications.

Language: Английский

Citations

10
Cesium‐Based Molecular Perovskites With Superior Stability for High‐Performance X‐Ray Detection DOI Open Access
Liang Wu, Qingsong Wei,

Yi‐Ming Di

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

Metal-free molecular perovskites have shown great potential for X-ray detection due to their tunable chemical structures, low toxicity, and excellent photophysical properties. However, limited absorption environmental instability restrict practical application. In this study, cesium-based (MDABCO-CsX3, X = Cl, Br, I) are developed by introducing Cs+ at the B-site enhance while retaining toxicity. The effects of halide modulation on physical properties device performance systematically investigated. Among variants, MDABCO-CsBr3 exhibited superior stability, attributed optimal ionic radius high stability Br-. This is further enhanced a higher tolerance factor, which promotes stable 3D cubic structure suppresses ion migration within crystal. Consequently, MDABCO-CsBr3-based detectors demonstrated reduced migration, minimal dark current drift, response under exposure, achieving sensitivity 4124 µC Gy-1 cm-2 limit 0.45 µGy s-1. Moreover, devices exhibit thermal operating effectively temperatures up 130 °C. These results highlight as promising candidate efficient detection, expanding applicability in advanced radiation technologies.

Language: Английский

Citations

1
Centimeter‐Sized Single Crystals of Dion‐Jacobson Phase Lead‐Free Double Perovskite for Efficient X‐ray Detection DOI

Qingshun Fan,

Haojie Xu, Shihai You

et al.

Small, Journal Year: 2023, Volume and Issue: 19(34)

Published: April 22, 2023

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 remarkable semiconductive characteristics such as high resistivity (2.2 1011 Ω cm), low trap state density (3.56 1010 cm-3 ), large mobility-lifetime product (1.72 10-3 cm2 V-1 ). Strikingly, its single-crystal-based detector shows sensitivity 223 µC Gy-1air cm-2 under 33.3 V mm-1 , detection limit (84.2 nGyair s-1 anti-fatigue. As far know, firstly demonstrates potential detection, showing excellent photoelectric response operational stability. This work will pave promising pathway innovative application for eco-friendly efficient

Language: Английский

Citations

20
Biocompatible Metal-Free Perovskite Membranes for Wearable X-ray Detectors DOI
Xinmei Liu,

Qingyue Cui,

Haojin Li

et al.

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

Citations

7
Radiochromic semiconductive MOFs with high sensitivity and fast photochromic responses for dual-mode X-ray direct detection DOI

Xu-Ying Yu,

Jia-Rong Mi,

Qiu-Pei Qin

et al.

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

Citations

6
Tailoring Multi‐Phenyl Ring Cation for Stable Scalable Hybrid Bismuth Iodide Amorphous Film: Enabling Record Sensitivity and High‐Performance X‐Ray Array Imaging DOI
Youkui Xu, Zhenhua Li,

Chang Shi

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(33)

Published: June 22, 2024

The 329-type bismuth (Bi)-based metal halide (MH) polycrystalline films have potential to be applied in the new generation of X-ray imaging technology owing high absorption coefficients and excellent detection properties. However, mutually independent [Bi

Language: Английский

Citations

6