Materials Today Physics
·
2020
·
IF 10.443
J. Xing,Y. Zou,C. Zhao,Z. Yu,Y. Shan,W. Kong,X. Zheng,X. Li,W. Yu,C. Guo
Carrier transfer is a key process for perovskite-based photoelectric conversion. It has a close relationship with grain boundaries, grain size , and contact layers. Understanding this relationship is of great significance for revealing the inherent characteristics of perovskite materials and for devices optimization. However, the dependence of carrier transfer characteristics (including carrier lifetime and mobility) on thickness is less studied, although which is a key issue for almost all perovskite material devices. Here we find that as the thickness of MAPbBr 3 perovskite single crystal (PSC) increases from 1.47 μm to 10.55 μm, the carrier lifetime of MAPbBr 3 decreases from 70 ns to 30 ns, and the carrier mobility decreases from 97 cm 2 V −1 s −1 to 57 cm 2 V −1 s −1 , but they become constant in very thick samples. In addition, it was found that as the crystal thickness increased from 1.47 μm to 10.55 μm, the surface layer range gradually increased from 12 nm to 31 nm. The surface recombination velocity and surface defect (trap) density further confirmed that the thin PSC exhibited a small surface layer range. Finally, a three-layer carrier transmission model of PSC is proposed. This research provides guidance for the optimal design of PSC optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 19
·6327-6335
·
IF 6.4
Zeyao Han,Yang Liu,Yousheng Zou,Junyu Li,Yin He,Haibo Zeng
One dimensional (1D) halide perovskites (HPs) have achieved tremendous progress in light emitting diodes, lasers, and photodetectors for their splendid optical properties, high mobility, and long diffusion length. However, unsatisfactory stability caused by inherent surface defects and notorious ion migration hinder their further development for commercial and practical applications. Herein, with the assistance of organic halide salts (phenyl-ethylammonium bromide (PEABr) and butylamine bromide (BABr)), we demonstrate a simple solution method for passivating the surface defects of the MAPbBr3 microwire. Owing to the coordination bonding between amino groups and Pb2+, the PEA or BA molecules spontaneously assemble onto the surface of the as-fabricated microwire, leading to an obvious enhancement of the photoluminescence (PL) intensity and an extended PL lifetime. Meanwhile, negligible hysteresis was observed due to the suppressed ion migration. As a consequence, the constructed passivated microwire-based photodetector exhibits an increased responsivity of 35 mA W−1, along with a −3 dB width of 740 Hz, a moderate LDR of 80 dB, and a weak noise current of 2.3 × 10−13 A × Hz−0.5. Moreover, the device exhibits an enhanced stability for over 21 days under a humidity of 50%. This work provides an effective strategy to endow 1D perovskites with improved performance and stability for further applications in the future.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Rongzhi Chen,Kuo Zhan,Yayue Wu,Yabin Zhu,Jun Yan,Bin Liu,Yunlin Chen
The extensive use of hypochlorite (ClO − ) as oxidant and bleach has drawn serious concern due to their adverse environment and biological impact. Herein, a novel fluorescence probe composite material based on MAPbBr 3 @ZIF-8 was prepared by agitation method in room temperature , using lead bromide, armour ammonia bromine, 2-methylimidazole and zinc acetate as precursors. MAPbBr 3 @ZIF-8 composites exhibited remarkable stability in NaCl aqueous solution and UV lamp. Thus, the MAPbBr 3 @ZIF-8 composites were successfully used as a fluorescence probe for detection of ClO − via electron transfer and dynamic quenching mechanism. The fluorescence probe can detect ClO − in water with high selectivity even existed other anions (HCO 3 − , SO 4 2− , Cl − , SiO 3 2− , CO 3 2− , NO 3 − , HSO 3 − ). Meanwhile, the response time of the MAPbBr 3 @ZIF-8 probe could be obtained to less than 40 s. The detection limit and quenching constant were calculated as 31.9 nM and 0.141 µM −1 . Furthermore, the fluorescence probe sensor showed excellent stability in natural environment with 94.6%-100.6% recovery rates. The fluorescence probe based MAPbBr 3 @ZIF-8 composites in this study is promising for detecting ClO − anion in water.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Chang Zhang,Xin Zhang,Wei Wang,Hao Xue,Qian He,Fenglin Li,Xiaoli Wang,Qinghui Jin,Kun Zhou,Jiawen Jian
This paper presents an ammonia (NH3) fluorescent sensor based on the MAPbBr3 perovskite and the multifunctional organic material (R/S)-OBN-tCz. The incorporation of (R/S)-OBN-tCz enhances the sensor's photoluminescence (PL) intensity through Förster resonance energy transfer (FRET) and passivation effects, which consequently improves the sensitivity of the gas sensor. The MAPbBr3&(R/S)-OBN-tCz@PMMA nanofibers fabricated via electrospinning technology not only increase the specific surface area effectively, which is crucial for sensitivity improvement, but also strengthen the stability of the perovskite material under an air atmosphere. The experimental results demonstrate that the sensor maintains stable PL performance for up to 30 days in air and over 10 hours in water, while exhibiting rapid and reversible fluorescence response to NH3.
研究领域:
材料科学
·
化学传感
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Feifei Qin,Yue Cao,Chengwei Wang,Guogang Zhang,Xiaoxuan Wang,Feng Chen,Gangyi Zhu,Yongjin Wang
Nowadays, most solid-state lighting-based visible light communication (VLC) technology suffers from the color converter’s short optical bandwidth or low stability. Herein, we fabricated MAPbBr3@PbBr(OH) nanocrystals (NCs) with high optical bandwidth and water-stable properties for color conversion of VLC and a white light-emitting diode (LED) system. The sample’s characteristic photoluminescence (PL) spectrum is green emission peaked near 529 nm. As a color converter, it has a high bandwidth capacity for devices. The sample indicates internal quantum efficiency (IQE) of about 38.33% and a PL decay time of about 5.5 ns, and it can maintain its PL properties in water for over 90 days The calculated optical bandwidth is about 49.4 MHz. Its measured −3 dB bandwidth with a 405 nm laser diode can reach 25 MHz with a data rate over 50 Mbps. More interestingly, the perovskite NCs can replace the green phosphor to build a high-speed and multicolor LED, and the −3 dB bandwidth can be maintained at over 80% in this case. These features are far beyond the abilities of commercial green phosphors. Finally, we demonstrate an underwater text transmission system with a 405 nm LED, perovskite color conversion layer, and low-cost silicon-based photodetector.
研究领域:
材料科学
·
光学工程
·
通信技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 21
·12467-12474
·
IF 10.7
Dong Liu,Xue Sun,Li Jiang,Xianyuan Jiang,Hao Chen,Fucai Cui,Guodong Zhang,Yong Wang,Ying-Bo Lu,Zhongchen Wu,Zhijun Ning,Xutang Tao
High-quality semiconductor single crystal materials play a significant role in achieving excellent photoelectric performance, fundamental to high-performance X-ray detectors. To mitigate the impact of temperature gradients and auxiliary substances, we developed a vacuum evaporation crystallization method. This method synthesizes high-quality MAPbBr3 single crystals with outstanding photoelectric properties, including a long carrier lifetime (1150 ns), low trap-state density (2.28 × 109 cm−3), and high carrier mobility (130 cm2 V−1 s−1). A planar MAPbBr3/Pt structure for an X-ray detector was designed and constructed, demonstrating a superior detection sensitivity of 24 552 μC Gy−1 cm−2 and an ultralow detection limit of 54 nGy s−1. Furthermore, even after being stored in ambient air at room temperature for 200 days, the unencapsulated detector retained 97.1% of its original photocurrent response under a dose rate of 21.09 μGy s−1. These results indicate that high-quality MAPbBr3 single crystals are promising candidates for high-performance X-ray detectors.
研究领域:
材料科学
·
半导体物理
·
辐射探测技术
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Heng Wang,Ruihua Nan,Zengyun Jian,Changqing Jin,Yongxing Wei,Yaping Bai,Hulin Li
MAPbBr 3 perovskite crystals have attracted significant attention due to their outstanding performance in various optoelectronic applications . However, further understanding for the growth mechanism of MAPbBr 3 and its temperature-dependent variations of MA + should be addressed. In this study, MAPbBr 3 single crystal was grown using the inverse temperature crystallization method with a crystallization temperature of approximately 60 °C. Optical microscopy and atomic force microscopy were used to illustrate the surface structure of the resultant MAPbBr 3 . The results show that there is a layered growth mode with concave grooves and 2D nuclei on its surface. In situ variable-temperature Raman measurements were performed on the MAPbBr 3 crystal at a temperature range of 80–300 K. The narrowing of Raman bands unrelated to the phase transition of the crystal was observed around 100 K. By combining the variable-temperature X-ray diffractometry results from 80 to 105 K, the reason can be attributed to the lattice distortion and vibration within the crystals.
研究领域:
材料科学
·
光学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2023
·
IF 3.8
Xin Liu,Quanchao Zhang,Dou Zhao,Ruichen Bai,Yingying Hao,Bin Fang,Yinjie Ruan,Binbin Zhang,Tongyang Wang,Chongjian Zhou,Wanqi Jie,Yadong Xu
The organic–inorganic hybrid halide perovskite MAPbBr3 has been considered as a promising material in many applications; however, the bulk MAPbBr3 crystals grown by the widely adopted inverse temperature crystallization (ITC) method without forced convection reveal poor reproducibility and moderate quality. Here, we employ a near-net-shape seeded solution method to grow inch-sized MAPbBr3 crystals as a space-confined way to approach the suitable thickness and minimize the loss resulting by cutting and polishing. The rotation parameters for introducing forced convection is determined according to solute transport behavior, which is associated with the space confinement thickness and rotation rate. The as-grown MAPbBr3 crystal with good homogeneity exhibits a recorded FWHM value of 0.011° in the high-resolution X-ray diffraction rocking curve, ascribed to the lower grown-in stress and strain by the liquid-phase epitaxial growth. Finally, the MAPbBr3 semiconducting photodetector demonstrates a relatively high resistivity of 3.75 × 108 Ω·cm and superior photoresponse under 405 nm laser. The near-net-shape synthesis method with a space confinement is potentially extended to the growth of other halide perovskite bulk crystals.
研究领域:
材料科学
·
光电材料
·
晶体生长技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Li Liu,Maomin Peng,Ke Xu,Hong Xia,Xitian Peng,Lijun Peng,Youxiang Zhou,Jin Z. Zhang
Highly stable and photoluminescent methylammonium lead halide perovskite quantum dots (MAPbBr3 PQDs) have been synthesized and applied for the fluorescence quenching detection of clothianidin in fruit and vegetable samples. Characterizations using different techniques, including photoluminescence (PL), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and time-resolved PL (TRPL), show that static quenching is the dominant fluorescence quenching mechanism of MAPbBr3 PQDs with clothianidin. Hydrogen bonds or van der Waals forces play major roles in the MAPbBr3 PQDs–clothianidin interaction. Under optimized conditions, the relative PL intensity of MAPbBr3 PQDs is linear to the concentration of clothianidin in the 0.0 and 20.0 mg/L range with a detection limit of 0.17 μg/kg. Excellent recoveries of 79.5–115.4% were acquired for radish and banana samples with a relative standard deviation below 9.4%. These results indicate that PQDs can be used for qualitative and quantitative identification of clothianidin, providing an effective detection method for risk prevention and control of neonicotinoid pesticide residues in agricultural products.
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2020
·
IF 4.302
Qun Wang,Ming Ma,Kai Cui,Xiaochen Li,Yan Zhou,Yang Li,Xiaohong Wu
Lead halide perovskites MAPbX 3 (MA = CH 3 NH 3 or Cs; X = I, Br, Cl) are well considered to be potential candidates for photocatalytic reaction due to its excellent photoelectrical properties, but they still suffer from the low charge separation efficiency and slow catalytic reaction dynamics. To tackle the drawbacks, herein, MAPbBr 3 /carbon sphere (CS) composite photocatalysts using glucose as the carbon source were elaborately designed and fabricated via a dry mechanochemical grinding process. The interfacial interaction Pb-O-C chemical bonds were constructed between MAPbBr 3 and the carbon sphere surface containing organic functional groups. By optimizing the content of CSs, the enhanced photocatalytic degradation kinetic rate of Malachite Green (MG) pollutants (92% within 20 min) for MAPbBr 3 /CS x ( x = 17 wt.%) is about 3.6-fold of that for pristine MAPbBr 3 , which is attributed to the corporative adsorption and enhanced carrier transportation and separation of MAPbBr 3 /CS x . Furthermore, the possible degradation mechanism was proposed on basis of the electrochemical, mass spectrometry and optical characterization results. Owing to the robust interfacial interaction, effective electron extraction rate ( k et = 4.6 × 10 7 sec − 1 ) from MAPbBr 3 to CS can be established, which driven oxygen activation where superoxide radicals (•O 2 − ) played an important role in MG degradation. It is expected that mechanochemistry strategy may provide a new route to design efficient lead halide perovskite-carbon or metal oxide or sulfide composite photocatalysts.
研究领域:
材料科学
·
环境化学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Yi Zhu,Feng Tong,Zheng Chen,Zijun Huang,Sheng Huang,Xiuquan Gu
This study addresses the challenge of synthesizing highly emissive and stable MAPbBr 3 nanocrystals (NCs) for practical device applications. A double-passivation approach was developed through using nitrogen-doped graphene quantum dots (NGQDs) and polyvinylidene fluoride (PVDF) during the in-situ synthesis of MAPbBr 3 NCs. By optimizing the amount of NGQDs, the resulting MAPbBr 3 /PVDF/NGQDs composite films exhibited green emission at 522 nm with a narrow spectral width of 17.7 nm. The films demonstrated exceptional stability, retaining 60 % of their initial photoluminescence (PL) intensity after 144 h of water immersion and 96 % of their initial intensity after 10 min of heating at 100 °C. This stability is attributed to the NGQDs reducing defects and acting as nitrogen-enhanced sites that promote consistent crystal formation. Additionally, the composite film was used to fabricate a white light-emitting diode (WLED) with a color gamut coverage rate of 125 % under the National Television Standards Committee (NTSC) standard and 93.8 % under the Rec.2020 standard. This work might present a synergistic strategy combining in-situ defect passivation with encapsulation, offering a viable solution to the stability-efficiency trade-off in perovskite NCs and advancing high-color-gamut flexible displays.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Physics
·
2020
·
IF 2.638
Liu Xin,Fu Jinghua,Zhao Dou,Hao Yingying,Zhu Hao,Xu Meng,Zhang Binbin,Jie Wanqi,Xu Yadong
High-quality organic–inorganic halide perovskite brings an opportunity for ideal nuclear radiation detection due to its large carrier mobility, lifetime, and heavy atoms. However, the relatively low bulk resistivity restricts its development for alpha particles and X/γ-ray detectors. Here, we report on the MAPbBr3−xIx (MPB:I) perovskite crystals grown using the modified inverse temperature crystallization method. Based on the measured supersolubility and solubility curves, the heating procedure was accurately designed to control the nucleation and growth rate. The resulting MPB:I single crystals exhibit higher bulk resistivity of 1.4 × 109 Ω cm, which is 10 times that obtained from the traditional inverse temperature crystallization method. Finally, an uncollimated 0.8 μCi 241Am @5.48 MeV alpha particles source was adopted to evaluate the MPB:I single crystals at room temperature condition. The electron mobility (μe) and mobility-lifetime product (μτ)e of (264.6 ± 6.5) cm2 V−1 s−1 and (2.6 ± 0.3) × 10−3 cm2/V, respectively, were obtained.
研究领域:
材料科学
·
核物理
·
辐射探测
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）