CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Jing Huang,Yi-Hua Wu,Zhi-Gang Zhu,Wan Y. Shih,Wei-Heng Shih
Methylammonium lead bromide (CH 3 NH 3 PbBr 3 ) nanocrystals have great potentials for lighting and display applications. Previously we synthesized CH 3 NH 3 PbBr 3 nanocrystals using oleylamine as capping molecule and found that by increasing the oleylamine to CH 3 NH 3 PbBr 3 perovskite ratio (OPR), the photoluminescence wavelengths and morphology of CH 3 NH 3 PbBr 3 nanocrystals could be varied from 530 nm (green) platelets to 460 nm (blue) particles. Here we modified the synthesis to direct injection of precursors into toluene and found that increasing OPR not only changes the wavelength and morphology of nanocrystals but also the size of the unit cells.
研究领域:
材料科学
·
光学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Mingzhe Hu,Xin Zhang,Chang Zhang,Feng Qiu,Jiujie Ruan,Xiaoli Wang,Yu Zhang,Jie Zou,Qinghui Jin,Jiawen Jian
Metal halide perovskite nanocrystals (MHPNCs) have emerged as promising fluorescent sensing materials owing to their excellent optical properties. However, surface defects significantly influence their sensing performance, highlighting the importance of defect passivation for improving sensing capability. In this study, a fluorescent NH 3 sensor film was fabricated via electrospinning, in which arginine(ARG)-modified MAPbBr 3 (MA refers to methylammonium) quantum dots were encapsulated within poly(methyl methacrylate) (PMMA) nanofibers to investigate the effect of arginine passivation on NH 3 sensing performance. Under dynamic gas sensing conditions at 25°C and an ambient relative humidity, the sensor exhibited a concentration-dependent NH 3 response in the range of 1.25–200 ppm. The ARG-modified sensor exhibited an approximately 115% higher sensitivity than the sensor without ARG. The sensor showed a more pronounced response toward NH 3 than interfering gases at 200 ppm. Moreover, the maximum response variation was 3.33% during five consecutive NH 3 sensing cycles, and the fluorescence intensity of the sensor membrane remained above 80% of its initial value after 180 days of storage.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yecheng Ding,Xuefeng Zhao,Zeen Zhao,Yaojin Wang,Tom Wu,Guoliang Yuan,Jun-Ming Liu
Lead halide perovskite materials, such as MAPbBr3 and MAPbI3, show excellent semiconductor properties, and thus, they have attracted a lot of attention for applications in solar cells, photodetectors, etc. Here, a periodic strain can dynamically manipulate the build-in electric field (Ebi) of the depletion region with piezoelectricity at the Au/MAPbBr3 interface. As a result, the photovoltaic short-circuit current density (Jsc) and the open-circuit voltage (Voc) are increased by 670 and 82%, respectively, by applying an external strain upon an asymmetric solar-cell-like Au/MAPbBr3/Ga structure. Furthermore, the equivalent piezoelectric d33 values of ∼3.5 pC/N are confirmed in the Au/MAPbBr3/Au structure with both the sinusoidal strain and the 405 nm light illumination with 220 mW/cm2 upon one semitransparent Au electrode. This study not only proves that pressure can effectively enhance the energy conversion efficiency of the halide perovskite-based solar cells and light detectors but also supposes a multifunctional sensor, which can detect light intensity, sense dynamic pressure, explore accelerated speed, etc. simultaneously.
研究领域:
材料科学
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光伏技术
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光电子学
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压电器件
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半导体物理
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JAPANESE JOURNAL OF APPLIED PHYSICS
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2025
·Vol. 64
·期 4
·041003
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IF 1.8
Peng Shen
Perovskite light-emitting diodes (PeLEDs) have gained widespread acceptance in the field of optoelectronics due to their exceptional performance. In this paper, CsBr was added to MAPbBr3 emissive layer in order to reduce the non-radiative recombination defects of perovskite films. The maximum luminance of the optimized device is 4248 cd m−2, and the maximum external quantum efficiency is 0.44%, which is 162% and 69% higher than that of the undoped device, respectively. This is primarily attributable to the fact that the incorporation of CsBr into the MAPbBr3 perovskite results in a reduction in the surface roughness of the perovskite film. Meanwhile, CsBr can passivate the internal defects of perovskites and inhibit the defect-assisted non-radiative recombination, thus improving the radiative recombination efficiency and leading to the enhancement of the device’s optoelectronic performance. These results have a positive effect on the further in-depth study of the performance and preparation process of PeLEDs.
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Carbon Energy
·
2023
·Vol. 5
·期 11
·e358
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IF 20.5
Ming Xu,Jianmin Gu,Zixun Fang,Yu Li,Xing Wang,Xiaoyu Zhao,Tifeng Jiao,Wei Wang
Colorless-to-black switching has attracted widespread attention for smart windows and multifunctional displays because they are more useful to control solar energy. However, it still remains a challenge owing to the tremendous difficulties in the design of completely reverse absorptions in transmissive and colored states. Herein, we report on an electrochemical device that can switch between colorless and black by using the electrochemical process of hybrid organic–inorganic perovskite MAPbBr 3 , which shows a high integrated contrast ratio of up to 73% from 400 to 800 nm. The perovskite solution can be used as the active layer to assemble the device, showing superior transmittance over the entire visible region in neutral states. By applying an appropriate voltage, the device undergoes reversible switching between colorless and black, which is attributed to the formation of lead and Br 2 in the redox reaction induced by the electron transfer process in MAPbBr 3 . In addition, the contrast ratio can be modulated over the entire visible region by changing the concentration and the applied voltage. These results contribute toward gaining an insightful understanding of the electrochemical process of perovskites and greatly promoting the development of switchable devices.
研究领域:
材料科学
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光电材料
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电化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2026
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IF 7.8
Yue Zhang,Yuanjie Sun,Zhe Liu,Huatong Zhao,Hongtao Zhao,Zhigang Li
Organic–inorganic hybrid perovskite single crystals have shown great potential as next-generation high-sensitivity X-ray detectors. However, the thermodynamic instability of their precursor solutions often leads to disordered nucleation and defect proliferation during crystallization, which considerably limits the performance of resulting devices. This study shows that polymeric inhibitor effectively suppresses disordered nucleation in perovskite precursor solutions. The coordination mechanism between PVP and the MAPbBr3 precursor solutions is revealed by IGMH (Independent Gradient Model based on Hirshfeld partition) analysis, density functional theory (DFT) calculations, and experimental results. It is revealed that PVP forms a distinct dual-site coordination complex with Pb2+, interacting simultaneously through its carbonyl and pyrrolidone ring. This specific coordination geometry significantly enhances the thermodynamic stability of the precursor system by maintaining an optimal solute concentration within the metastable zone, thus effectively inhibiting spontaneous nucleation. The MAPbBr3 (with PVP) SC (single crystal) exhibits a low defect density of 6.56 × 108 cm–3 and a high carrier mobility-lifetime product (μτ) of 1.11 × 10–3 cm2·V–1. The X-ray detector fabricated based on the crystal demonstrates a high sensitivity of 1.73 × 104 μC·Gyair–1·cm–2 and a low detection limit of 43.55 nGyair·s–1. This study provides a new strategy for modulating perovskite crystallization kinetics through coordination engineering, offering a viable pathway for developing high-performance radiation detectors.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2026
·Vol. 37
·期 12
·942
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IF 3.2
Guo Chaofan,Du Yiping,Guan Haoyang,Zhu Jinglong,Ma Lin,Yan Zhengguang,Xiao Jiawen
Narrowband photodetectors exhibit considerable potential for high-resolution imaging and encrypted communication systems owing to their high spectral resolution capabilities. In this study, a composite perovskite single-crystal heterojunction (SCH) consisting of MAPbBr 3 and MAPbI 3 was fabricated by epitaxially growing MAPbI 3 on a MAPbBr 3 single crystal substrate. A carbon paste light-window electrode was applied to the MAPbI 3 surface following a spatially modulated electrode strategy. The resulting device demonstrates outstanding narrowband detection performance, featuring a full width at half maximum ( FWHM ) of 21 nm, a spectral rejection ratio ( SRR ) of 137, a specific detectivity of 1.24 × 10 11 Jones (cm Hz 1/2 W −1 ), a responsivity of 0.56 A W −1 , and a fast response time (34.86/42.81 μs). The exceptional narrowband detection capabilities of this single-crystal heterojunction device would broaden the application prospects of perovskite-based photodetectors in the field of optoelectronics.
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ACS Applied Optical Materials
·
2026
·
IF 3.4
Dong Liu,Shuyi Zhang,Luzong Jing,Hao Wang,Guanwen Chen,Longfei Xu,Hongqiang Song,Xiangliang Kong,Zhongchen Wu,Yao Chen
The rapid expansion of commercial spaceflight is driving space X-ray detectors toward ultimate cost-effectiveness. Compared with conventional semiconductors, metal halide perovskites, with superior optoelectronic properties and low-cost solution processability, are promising candidates for space radiation detection. Herein, we first synthesized Nd-MAPbBr3 single crystals, with Nd3+ causing lattice contraction and thus improving the crystal tolerance factor. We uncover a correlation between color evolution and crystallization, with the precursor solution turning purple from colorless after adding NdBr3 and yellowing during crystallization due to methylamine oxidation. The fabricated planar Nd-MAPbBr3 X-ray detector exhibits a sensitivity of 162.64 μC Gy–1 cm–2 and a detection limit of 4 μGy s–1 under a low electric field of 20 V cm–1. Notably, after cumulative X-ray irradiation of 320 mGy, the sensitivity of the Nd-MAPbBr3 detector improves by 33.75%, demonstrating superior radiation tolerance. These results highlight Nd-MAPbBr3 single crystals as a promising material for space X-ray detection.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Shu Nie,Yi Zhu,Xiangyi Bai,Xiuquan Gu,Xiaoyi Wang,Lei Zhu,Sheng Huang
Organic-inorganic hybrid perovskite nanocrystals (NCs) exhibit outstanding optoelectronic properties, including high photoluminescence quantum yield, tunable bandgap, and high color purity. They hold immense application potential in next-generation optoelectronic fields such as light-emitting diodes, photodetectors, and solar cells. However, their inherent instability and susceptibility to ion migration severely hinder practical implementation. Surface passivation, a key strategy for enhancing perovskite nanocrystal stability, faces the challenge of resisting water molecule intrusion. This work proposes a passivation strategy based on the bifunctional ligand 3-mercaptoacetic acid (MPA). Mediated by MPA, a non-lead metal salt, Zn(CH 3 COO) 2 , forms a passivation layer on the surface of MAPbBr 3 nanocrystals.Density functional theory (DFT) calculations at the Perdew–Burke–Ernzerhof (PBE) level elucidate this dual-functional mechanism at the molecular level. Molecular electrostatic potential analysis reveals that the sulfur atom in MPA's thiol group (-SH) acts as a nucleophilic center, strongly bonding with Pb 2 + to eliminate surface halide vacancies and passivate interface defects, which is supported by a high adsorption energy of −2.21 eV. Simultaneously, the oxygen atoms in its carboxyl group (-COOH), carrying a strong negative charge, effectively chelate Zn 2+ . This interaction exhibits a lower adsorption energy (−0.037 eV), which helps to lower the deposition barrier and guides the uniform, conformal coverage of Zn(CH 3 COO) 2 over the perovskite surface. This interfacial chemical design achieves near-defect-free interface bonding while constructing a dense hydrophobic barrier to address perovskite's water sensitivity—passivated modified nanocrystals maintained over 60 % of their initial photoluminescence intensity after 6 days of pure water immersion, significantly outperforming unmodified pristine nanocrystals. When applied as color conversion and light-absorbing layers in optoelectronic devices: the white light-emitting diode (WLED) achieved 130.6 % NTSC and 97.5 % Rec. 2020 wide color gamut output; the planar solar cell attained 15.1 % power conversion efficiency, a 2.3 % improvement over unmodified devices; The photocurrent response of the ultraviolet detector increased from 9.89 μA/cm² to 11.89 μA/cm², with the light-to-dark current ratio rising from 23 to 61.29. This study provides an innovative approach to ligand engineering for designing high-performance, highly stable perovskite nanomaterials and deepens the understanding of interfacial passivation mechanisms.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Hao Hu,Jianping Yang,Junfeng Chen,Jiaxuan Hao,Ping Lin,Lingbo Xu,Peng Wang,Xiaoping Wu,Tiantian Liu,Can Cui
Perovskite single crystals offer superior optoelectronic properties but face challenges in spectral response range and device performance. Here, we report a high-performance photodetector based on Rb-doped MAPbBr 3 /MAPbI 3 heterojunction fabricated via liquid-phase epitaxy. Systematic characterization reveals that Rb + incorporation effectively reduces defect density (from 3.02 × 10 9 to 2.48 × 10 9 cm −3 ) and prolongs carrier lifetime (from 12.09 ns to 145.41 ns), while the integration with MAPbI 3 microcrystals extends the spectral response range from the green to the red region (450–750 nm). DFT calculations and UPS reveal that Rb doping tailors the electronic structure of MAPbBr 3 , optimizing band alignment with MAPbI 3 to enhance built-in field for charge separation while increasing work function to suppress dark current. Consequently, the Rb-doped heterojunction device achieves an order-of-magnitude enhancement in both responsivity (600 m A/W) and detectivity (~2.5 × 10¹² Jones), together with excellent operational and environmental stability (retaining >70% performance after 90 days in air), and a fast response time of 6.29 μs. This work establishes Rb doping as an effective strategy integrating defect passivation and band engineering for high-performance perovskite photodetectors.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Shuang Zhou,Qiying Wang,Zhendong Xu,Shenke Xu,Peiyi Yang,Hao Deng,Bobo Li,Yifan Dong,Peigang Han,Yaorong Su
Exploring high performance photocatalysts is of great importance to relieve the environment pollution issues. In this paper, we introduce a facile antisolvent solvothermal method to synthesize methylammonium lead tribromide perovskite (MAPbBr 3 ) nanocrystals and successfully employ them as efficient photocatalysts. Compared to the room temperature synthesized MAPbBr 3 (RT-MAPbBr 3 ), the antisolvent solvothermal synthesized MAPbBr 3 (AS-MAPbBr 3 ) has multiple outstanding properties, such as improved crystallinity with lower grain boundary density, enhanced light absorption in visible range, suitable band gap of 2.31 eV and extended photoluminescence (PL) lifetime as long as 2627.82 ns. By taking advantages of the above merits, the AS-MAPbBr 3 exhibits efficient photocatalytic performance by decomposition of methyl orange under solar light. A high apparent rate constant of 101.2 × 10 −3 is achieved along with excellent cyclability, which significantly outperforms the RT-MAPbBr 3 (56.0 × 10 −3 ) and P25 (16.5 × 10 −3 ). The underlying mechanism for MO photocatalytic degradation is deeply explored and proposed. Our present study suggests that the antisolvent solvothermal method can be a promising method to synthesize perovskite nanocrystals, and might also provide some insights in developing a series of high performance perovskite based photocatalysts.
研究领域:
材料科学
·
化学
·
环境科学
·
纳米技术
·
光催化
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DOI
PubMed
高影响因子
MRS Communications
·
2022
·Vol. 12
·期 4
·460-464
·
IF 2.935
Xu Min,Chen Botong,Wang Qi,Zhang Yuan,Wang Yuhao,Duhm Steffen,Liu Lijia
Methylammonium lead halide perovskite (MAPbX 3 ) has been a great candidate for photovoltaic applications. However, dissociation of the methylammonium unit has been observed, producing a CH 3 – group binding to MAPbX 3 and a free NH 3 molecule. To date, there is no clear evidence on the specific binding site of CH 3 –. In this study, MAPbBr 3 thin films are prepared with deliberately added trimethyl lead bromide, (CH 3 ) 3 PbBr. X-ray photoelectron spectroscopy is applied to comparatively investigate the electronic structure of MAPbBr 3 films with and without (CH 3 ) 3 PbBr modification. CH 3 -Pb species are identified, confirming that Pb is a binding site for CH 3 produced upon MA dissociation. Graphical abstract
研究领域:
材料科学
·
物理化学
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高影响因子
危险品化学品经营许可证（带存储）