Ammonium cations with high pKa in perovskite solar cells for improved high-temperature photostability

Nature Energy, Journal Year: 2023, Volume and Issue: 8(11), P. 1229 - 1239

Published: Sept. 28, 2023

Language: Английский

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Energy‐Trapping Management in X‐Ray Storage Phosphors for Flexible 3D Imaging

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(16)

Published: Feb. 18, 2023

X-ray imaging has received sustained attention for healthcare diagnostics and nondestructive inspection. To develop photonic materials with tunable photophysical properties in principle accelerates radiation detection technologies. Here the rational design synthesis of doped halide perovskite CsCdCl3 :Mn2+ , R4+ (R = Ti, Zr, Hf, Sn) are reported as next generation storage phosphors, capability is greatly improved by trap management via Mn2+ site occupation manipulation heterovalent substitution. Specially, Zr4+ displays zero-thermal-quenching (TQ) radioluminescence anti-TQ X-ray-activated persistent luminescence even up to 448 K, further revealing charge-carrier compensation redeployment mechanisms. resolution 12.5 lp mm-1 demonstrated, convenient 3D curved objects realized a time-lapse manner. This work demonstrates efficient modulation energy traps achieve high capacities promote future research into flexible detectors.

Language: Английский

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Halide Perovskite: A Promising Candidate for Next‐Generation X‐Ray Detectors

Advanced Science, Journal Year: 2022, Volume and Issue: 10(1)

Published: Dec. 1, 2022

Abstract In the past decade, metal halide perovskite (HP) has become a superstar semiconductor material due to its great application potential in photovoltaic and photoelectric fields. fact, HP initially attracted worldwide attention because of excellent efficiency. However, derivatives also show promise X‐ray detection their strong absorption, high bulk resistivity, suitable optical bandgap, compatibility with integrated circuits. this review, basic working principles modes both direct‐type indirect‐type detectors are first summarized before discussing applicability for these two types based on pros cons different perovskites. Furthermore, authors expand view preparation methods developed including single crystals polycrystalline materials. Upon systematically analyzing photoelectronic characteristics basis structures dimensions (0D, 2D, 3D), recent progress HPs (mainly polycrystalline) applied flexible reviewed, practicability feasibility discussed. Finally, by reviewing current research HP‐based detection, challenges field identified, main directions prospects future suggested.

Language: Английский

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Electron‐Phonon Coupling Suppression by Enhanced Lattice Rigidity in 2D Perovskite Single Crystals for High‐Performance X‐Ray Detection

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(7)

Published: Dec. 2, 2022

2D Dion-Jacobson (DJ) perovskite single crystals (PSCs) usually demonstrate better X-ray detection performance than Ruddlesden-Popper (RP) PSCs. However, the mechanism of improved is still elusive. Here, by aid strong interactions between dimethylbiguanide (DGA) and PbI2 , a novel DJ-perovskitoid (DGA)PbI4 designed. From comparison to other PSCs, it discovered that tiniest lattice distortion increased hydrogen bonds in atom-scaled analysis strengthen rigidity weaken electron-phonon coupling suppress disordered scattering carriers, resulting significantly carrier transport stability. Therefore, high mobility (78.1 cm2 V-1 s-1 ) pronounced sensitivity 4869.0 µC Gyair-1 cm-2 are achieved using which best Pb-based PSC devices date. Finally, exhibit good spatial resolution imaging excellent long-term stability work as promising candidate for medical diagnostics nondestructive determination.

Language: Английский

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Enabling low-drift flexible perovskite photodetectors by electrical modulation for wearable health monitoring and weak light imaging

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Aug. 16, 2023

Metal halide perovskites are promising for next-generation flexible photodetectors owing to their low-temperature solution processability, mechanical flexibility, and excellent photoelectric properties. However, the defects notorious ion migration in polycrystalline metal often lead high unstable dark current, thus deteriorating detection limit long-term operations. Here, we propose an electrical field modulation strategy significantly reduce current of perovskites-based photodetector more than 1000 times (from ~5 nA pA). Meanwhile, is effectively suppressed, shows a continuous operational stability (~8000 s) with low signal drift (~4.2 × 10-4 pA per second) ultralow (~1.3 10-5 second). Benefitting from strategy, signal-to-noise ratio wearable photoplethysmography sensor active-matrix array weak light imaging successfully demonstrated. This work offers universal improve performance image applications.

Language: Английский

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Extensible Integrated System for Real‐Time Monitoring of Cardiovascular Physiological Signals and Limb Health

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(51)

Published: Aug. 12, 2023

In recent decades, the rapid growth in flexible materials, new manufacturing technologies, and wearable electronics design techniques has helped establish foundations for noninvasive photoelectric sensing systems with shape-adaptability "skin-like" properties. Physiological includes humidity, mechanical, thermal, photoelectric, other aspects. Photoplethysmography (PPG), an important method measuring pulse rate, blood pressure, oxygen, uses attenuated signal obtained by light absorbed reflected from living tissue to a source realize real-time monitoring of human health status. This work illustrates patch-type optoelectronic system that integrates perovskite photodetector all-inorganic light-emitting diodes (LEDs) PPG signals. The rate body swelling degree finger joints can be extracted analyzed using photodetectors, thus prevention early diagnosis certain diseases. Specifically, this develops 3D wrinkled-serpentine interconnection wire increases shape adaptability device practical applications. sensor reported study considerable potential future intelligent medical

Language: Английский

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Strain Control to Stabilize Perovskite Solar Cells

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(48)

Published: Sept. 19, 2022

Abstract Perovskite solar cells (PSCs) are rivaling most commercial photovoltaics in the aspect of efficiency and cost, while their intrinsic instability remains a major concern for practical deployment. The presence undesirable strain PSCs during device fabrication operation refers to extension/narrowing chemical bonds expansion/shrinkage lattice volume, which largely affects stability due promoted phase transition, decomposition, mechanical fragility. Pioneering investigations remarkable achievements have revealed that control is indispensable design stable PSCs. Herein, evolution perovskite thin films its effect on performance elucidated, state‐of‐the‐art strategies modulation systematically reviewed. A thorough understanding cautious strain‐related phenomenon pave pathway derive materials with desired properties.

Language: Английский

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Interlayer‐Spacing Engineering of Lead‐Free Perovskite Single Crystal for High‐Performance X‐Ray Imaging

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(18)

Published: Feb. 18, 2023

Lead-free A3 Bi2 I9 -type perovskites are demonstrated as a class of promising semiconductors for high-performance X-ray detection due to their high bulk resistivity and strong absorption, well reduced ion migration. However, long interlamellar distance along c-axis, limited carrier transport the vertical direction is bottleneck sensitivity. Herein, new A-site cation aminoguanidinium (AG) with all-NH2 terminals designed shorten interlayer spacing by forming more stronger NH···I hydrogen bonds. The prepared large AG3 single crystals (SCs) render shorter larger mobility-lifetime product 7.94 × 10-3 cm2 V-1 , which three times higher than value measured on best MA3 SC (2.87 ). Therefore, detectors fabricated exhibit sensitivity 5791 uC Gy-1 cm-2 low limit 2.6 nGy s-1, short response time 690 µs, all far better those state-of-the-art detectors. combination stability enables astonishingly spatial resolution (8.7 lp mm-1 ) imaging. This work will facilitate development low-cost lead-free

Language: Английский

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Ultrahigh‐Flux X‐ray Detection by a Solution‐Grown Perovskite CsPbBr₃ Single‐Crystal Semiconductor Detector

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

Published: March 21, 2023

Solution-processed perovskites are promising for hard X-ray and gamma-ray detection, but there limited reports on their performance under extremely intense X-rays. Here, a solution-grown all-inorganic perovskite CsPbBr3 single-crystal semiconductor detector capable of operating at ultrahigh flux 1010 photons s-1 mm-2 is reported. High-quality single crystals fabricated into detectors with Schottky diode structure eutectic gallium indium/CsPbBr3 /Au. A high reverse-bias voltage 1000 V (435 mm-1 ) can be applied small stable dark current ≈60-70 nA (≈9-10 ), which enables sensitivity larger than 10 000 µC Gyair-1 cm-2 simultaneous low detection limit 22 nGyair . The shows an excellent photocurrent linearity reproducibility 58.61 keV synchrotron X-rays from 106 to Defect characterization by thermally stimulated spectroscopy similar defect density lab irradiated device. Solid-state nuclear magnetic resonance suggests that the crystal may associated its good short-range order, comparable spectrometer-grade melt-grown

Language: Английский

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Sensitive photodetection below silicon bandgap using quinoid-capped organic semiconductors

Science Advances, Journal Year: 2023, Volume and Issue: 9(13)

Published: March 31, 2023

High-sensitivity organic photodetectors (OPDs) with strong near-infrared (NIR) photoresponse have attracted enormous attention due to potential applications in emerging technologies. However, few semiconductors been reported photoelectric response beyond ~1.1 μm, the detection limit of silicon detectors. Here, we extend absorption small-molecule below bandgap, and even 0.77 eV, through introducing newly designed quinoid-terminals high Mulliken-electronegativity (5.62 eV). The fabricated photodiode-type NIR OPDs exhibit detectivity (D*) over 1012 Jones 0.41 1.2 μm under zero bias a maximum 2.9 × at 1.02 which is highest D* for photovoltaic-mode spectra 1.1 μm. 0.9 comparable those commercial InGaAs photodetectors, despite our shorter than (~1.7 μm). A spectrometer prototype wide measurable region (0.4 1.25 μm) imaging 1.2-μm illumination are demonstrated successfully OPDs.

Language: Английский

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