Nature Photonics
·
2024
·Vol. 18
·期 8
·870-877
·
IF 32.3
Hua Yunqiu,Zhang Guodong,Sun Xue,Zhang Peng,Hao Yingying,Xu Yadong,Yang Yujie,Lin Qianqian,Li Xiang,Zhai Zhongjun,Cui Fucai,Liu Hongjie,Liu Jiaxin,Tao Xutang
Halide perovskites have shown great potential for X-ray detection in medical imaging and product inspection applications. However, the ion migration in perovskites causes large noise and baseline drift, deteriorating the X-ray detection and imaging performance. Here we adopt the atmosphere-controlled edge-defined film-fed growth (EFG) method to grow high-quality shape-controlled CsPbBr 3 single crystals (SCs) in an Ar and HBr mixed atmosphere. Compared with the vertical Bridgman (VB)-CsPbBr 3 SCs, the EFG-CsPbBr 3 SCs show a much lower trap density, a higher resistivity (1.61 × 10 10 Ω cm) and a larger ion migration activation energy (0.378 eV), decreasing the leakage current and baseline drift. An X-ray detector based on EFG-CsPbBr 3 SCs hence exhibits outstanding balanced performance, with a negligible dark-current drift of 1.68 × 10 −9 μA cm −1 s −1 V −1 , an incredibly low detection limit of 10.81 nGy air s −1 and a sensitivity of 46,180 μC Gy air −1 cm −2 under a high electric field of 5,000 V cm −1 . Furthermore, the detector maintains a stable response for 30 days. Our work provides an effective strategy to improve lead-halide perovskite SCs for high-performance X-ray detection and imaging.
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DOI
高影响因子
Small
·
2024
·
IF 13
Haoying Wang,Junfeng Xiong,Yuzhen Cai,Wei Fu,Yukun Zhong,Teng Jiang,U Kei Cheang
All-inorganic cesium lead halide (CsPbX 3 , X = Cl, Br, I) perovskite nanocrystals have drawn great interest because of their excellent photophysical properties and potential applications. However, their poor stability in water greatly limited their use in applications that require stable structures. In this work, a facile approach to stabilize CsPbBr 3 nanowires is developed by using SU-8 as a protection medium; thereby creating stable CsPbBr 3 /SU-8 microstructures. Through photolithography and layer-by-layer deposition, CsPbBr 3 /SU-8 is used to fabricate bilayer achiral microswimmers (BAMs), which consist of a top CsPbBr 3 /SU-8 layer and a bottom Fe 3 O 4 magnetic layer. Compared to pure CsPbBr 3 nanowires, the CsPbBr 3 /SU-8 shows long-term structural and fluorescence stability in water against ultrasonication treatment. Due to the magnetic layer, the motion of the microswimmers can be controlled precisely under a rotating magnetic field, allowing them to swim at low Reynolds number and tumble or roll on surfaces. Furthermore, CsPbBr 3 /SU-8 can be used to fabricate various types of planar microstructures with high throughput, high consistency, and fluorescence properties. This work provides a method for the stabilization of CsPbBr 3 and demonstrates the potential to mass fabricate planar microstructures with various shapes, which can be used in different applications such as microrobotics.
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Wenying Zhu,Shun Cheng,Eenrou Mei,Ye He,Jiapeng Yang,Ruowang Liu,Xiaojuan Liang,Weidong Xiang
All-inorganic perovskite quantum dots (PQDs) are widely applied in photoelectronics because of their high luminous efficiency. However, PQDs have poor stability, which hinders their practical applications. In this study, controllable crystallization of PQDs is achieved by adding Al 2 O 3 to alter the glass network. Next, Na 2 CO 3 (aq) washing-heating treatment is used to improve the protective mechanism. Owing to this dual strategy, the prepared CsPbBr 3 @glass exhibits a high photoluminescence quantum yield (PLQY > 95%) and excellent stability. In a 1000 h accelerated aging experiment, the luminous intensity remains above 96% of the initial intensity. The luminescence intensity shows almost no change after soaking in water for 20 weeks. Finally, the CsPbBr 3 @CsPbBr 1 I 2 @PET light-conversion film is prepared by the sandwich method. Its color gamut covers 138% of the NTSC 1953 and 102% of the Rec. 2020. This CsPbBr 3 @glass with a high PLQY and ultrastability will broaden the scope of perovskite materials in displays.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yang Ding,Benlin He,Jingwei Zhu,Wenyu Zhang,Guodong Su,Jialong Duan,Yuanyuan Zhao,Haiyan Chen,Qunwei Tang
An all-inorganic cesium lead bromide (CsPbBr3) halide has attracted growing attention for carbon-based perovskite solar cells (PSCs) owing to its inherent stable lattice in thermal and/or moisture ambient. The main drawback for carbon-based CsPbBr3 PSCs is the low power conversion efficiency (PCE) caused by serious charge recombination at perovskite surfaces and/or device interfaces. To address this problem, an interface engineering strategy by modifying a polyvinyl acetate (PVAc) polymer with a carbonyl group at the interface of CsPbBr3/carbon is implemented to passivate perovskite surface defect states and also to improve energy-level alignment between the valence band of CsPbBr3 and work function of carbon, suppressing charge recombination and accelerating charge separation. By introducing the graphene oxide (GO) layer for further promoting hole extraction and decreasing energy-level difference, the PSC with an architecture of FTO/c-TiO2/m-TiO2/CsPbBr3/PVAc/GO/carbon achieves a champion PCE as high as 9.53%, yielding an improvement by 44.0% compared with 6.62% for the original device. Furthermore, the optimal device free of encapsulation exhibits remarkable long-term stability under high humidity, high temperature, and continuous illumination in air. This work provides a new polymer as the interface modification material for reducing defect states as well as enhancing energy-level alignment and suggests an effective approach for fabricating efficient and stable carbon-based CsPbBr3 PSCs.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yujie Wu,Danrui Pan,Jinlin Yin,Shaoke Chen,Jin Wang,Ahmed Mahmoud Idris,Zhengquan Li
Designing compact heterojunctions with optimized light absorption and carrier separation is a promising approach to realizing economically viable CO 2 photoreduction, yet it requires intricate structural and electronic engineering. Herein, a compact 0D/2D heterojunction was constructed by growing CsPbBr 3 nanocrystals (NCs) in situ on ultrathin porous nanosheets of Ni-doped LaFeO 3 . The resulting Ni-doped LaFeO 3 /CsPbBr 3 heterojunction exhibits a broad light absorption range. Mechanistic investigations reveal that the charge transfer follows a direct Z-scheme mechanism, thereby enabling highly efficient charge separation and transport. As a result, the optimized LaFe 0.74 Ni 0.26 O 3 /CsPbBr 3 exhibited a remarkable CO yield of 49.5 μmol g −1 h −1 with an electron consumption rate of 107.8 μmol g −1 h −1 , which is twice that of its undoped heterojunction and 5.5 times higher than pristine CsPbBr 3 NCs, setting a new benchmark among reported solid–gas CO 2 reduction systems with visible light. This work highlights the synergistic benefits of heteroatom doping and heterojunction engineering in enhancing photocatalytic performance, offering valuable insights for the development of efficient photocatalysts for solar-driven CO 2 photoreduction.
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高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 31
·期 8
·085401
·
IF 3.399
Yuxin Yao,Pengjie Hang,Peng Wang,Lingbo Xu,Can Cui,Jiangsheng Xie,Ke Xiao,Ge Li,Ping Lin,Shuai Liu,Danyan Xie,Siyuan Che,Deren Yang,Xuegong Yu
The performance of hybrid perovskite solar cells (PSCs) is significantly influenced by the crystallization and morphology of perovskite films. Herein, a novel method of CsPbBr3 quantum dots (QDs) assisted nucleation is applied to prepare high quality solution-processed methylammonium lead iodide (MAPbI3) films by employing CsPbBr3 QDs as an additive into diethyl ether anti-solvent. The appropriate amount of CsPbBr3 QDs can act as effective heterogeneous nucleation centers, leading to the formation of smooth and pinhole-free perovskite films with increased grain size. Furthermore, the growth direction of MAPbI3 grains is regulated by CsPbBr3 QDs, exhibiting preferential orientation of (110) plane. Therefore, the MAPbI3 films with CsPbBr3 QDs modification show reduced defects and increased carrier lifetime. As a result, the champion PSC with a maximum power conversion efficiency (PCE) up to 20.17% is achieved and 85% of its initial PCE is maintained after aging 1000 h at room temperature under a relative humidity of 50%. This work demonstrates a feasible way to prepare high quality perovskite films for optoelectronic applications.
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Applied Sciences-Basel
·
2020
·Vol. 10
·期 6
·2148
·
IF 2.474
Marco Anni,Arianna Cretì,Yuhai Zhang,Maria Luisa De Giorgi,Mauro Lomascolo
In this work, we present a detailed optical investigation of the effects of the environment on the photoluminescence (PL) spectra and the relaxation dynamics of pristine and aged CsPbBr3nanocrystal (NC) thin films. We demonstrate that, contrary to previous results on similar NCs, the PL intensity of pristine NCs is higher when the sample is in wet air than in vacuum, due to the passivation of defects reducing the free exciton trapping and the bound excitons non-radiative relaxation. The aged NCs show a PL intensity increase in wet air nine times stronger than the pristine ones, due to an interplay between static and dynamic effects, increasing the number of emitting NCs and reducing the non-radiative recombination rate of free excitons. These results improve the understanding of the possible interactions between perovskite NCs and the environment, which could be relevant for the development of optical gas sensors exploiting perovskite NCs.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2020
·Vol. 37
·期 3
·2000008
·
IF 3.099
Zhen Li,Huali Liu,Fei Li,Jiaqi Zhao,Yu Wang
The direct synthesis of a chiral nematic liquid crystalline phase of AgNR@SiO 2 @cysteine@CsPbBr 3 hybrid nanorods (HNRs) is reported. The circular dichroism spectra can be divided into three components: (1) the interband absorption–enhanced optical activity of structural arrangement of cysteine (cys) molecules, 200–320 nm, (2) the chiral nematic liquid crystalline arrangement of the Ag nanorods (AgNRs), 350–450 nm, and (3) the exciton adsorption edge of the perovskite, 500–550 nm. The polarizing optical microscope images indicate that the chiroptical response of perovskite arises from chiral nematic crystalline arrangement rather than cys-induced electronic coupling between a chiral ligand and otherwise achiral perovskite quantum dots (QDs). The luminescent intensity of CsPbBr 3 QDs in AgNR@SiO 2 @cys@CsPbBr 3 HNRs is boosted 87-fold due to the local surface plasmon resonance field enhancement effect. Furthermore, the high-performance green light emitting diode is constructed employing AgNR@SiO 2 @cys@CsPbBr 3 complexes, which exhibit excellent luminescent properties. This work contributes insights into structure–property relationships and this strategy promisingly provides guidance for the other inorganic chiral semiconductor suprastructures.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Meiting Yang,Qin Wang,Yao Tong,Lanlan Zhai,Weidong Xiang,Xiaojuan Liang
All-inorganic perovskite CsPbX 3 (X = Cl, Br, I) nanocrystals (NCs) are becoming a critical material for the narrow-band fluorescent material in the field of backlit displays. Herein, CsPbBr 3 (CPB) NCs glasses with finely adjustable wavelength were successfully prepared in the narrow range of 522–533 nm by controlling the content of MgO in borosilicate glass matrix. It is surprising that the addition of MgO enhances the optical properties of CPB NCs, as well as improves their stability. Furthermore, in order to verify its application in backlight display, the light conversion film with a color gamut of up to 129% of NTSC 1953 was successfully prepared, displaying more details of object color on the liquid crystal display (LCD) screen compared with commercial one. These results undoubtedly provide a broad road for wide color gamut backlight display with respect to perovskite nanomaterials.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Mengfeifei Jin,Weijie Zhou,Wenqiang Ma,Qin Wang,Xiaojuan Liang,Peiqing Zhang,Weidong Xiang
In the era of big data, the large amount of data generated every second requires modern and advanced data storage technologies. Femtosecond (fs) laser induced crystallization allow for the realization of fixed-point crystallization inside the CsPbBr 3 nanocrystals glasses (CPB), which can be applied in data storage. However, CPB is prone to self-crystallization prior to further heat treatment, interfering with fs-induced crystallization inside the glass and seriously hindering its application in data storage. Herein, we first propose the inhibition of CPB from self-crystallization by modulating the content of ZnO (4–20 mol%) using a melt-quenching method. ZnO was employed as a network modifier and was closely related to the glass network structure. When the content of ZnO was 4%, the CPB did not self-crystallize and was colorless. It was applied in the rewritable data storage by combining the 800 nm fs laser-induced crystallization, annealing (460 ℃/0.5 h) and fs laser erasing (20 mW). This work demonstrates a simple and efficient way to control the self-crystallization of CPBs, enhancing their potential practical application in high-capacity optical data storage with ultra-long working lifetimes.
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高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 17
·175404
·
IF 2.9
Yafei Xu,Cong Yan,Hongfei Liang,Sheng Huang,Ping Feng,Jian Song
Silicon solar cell is the most mature photovoltaic conversion device, and in order to further improve the performance of the device, application of downshifting films has become a research hotspot. In this paper, CsPbBr3 perovskite quantum dot/EVA composite adhesive film was prepared by melting method with CsPbBr3 perovskite quantum dot film under solution processing as masterbatch and EVA particles as excipient. The effect of synthesis conditions on the luminescence properties of the composite films were thoroughly studied. The optimized CsPbBr3 perovskite quantum dot/EVA composite adhesive film has excellent performance, and its light transmission reaches 85%. The CsPbBr3 perovskite quantum dot/EVA composite adhesive film absolutely improves the efficiency of silicon solar cells by 1.08%, which is much higher than that of pure EVA adhesive film (0.63%). In addition, the device efficiencies have almost no change after 30 d in the air, maintaining the working stability of the device and contributing to industrial applications. This study provides a novel, industrial and low-cost synthesis route for the synthesis of CsPbBr3 perovskite quantum dot/EVA composite adhesive film, which is expected to have broad application.
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CRYSTENGCOMM
·
2020
·Vol. 22
·期 10
·1853-1857
·
IF 3.117
Rui Qu,Leideng Zou,Xiaofei Qi,Cheng Liu,Wu Zhao,Junfeng Yan,Zhiyong Zhang,Yunlong Wu
Here, we present that the shape and optical properties of CsPbBr3 nanocrystals (NCs) could be tuned by addition of various hydrohalic acids (HX, X = Cl, Br, I). The addition of hydrochloric acid (HCl) and hydrobromic acid (HBr) turns the nanocrystals from nanocubes (NCUs) to quantum dots (QDs). The optical properties are regulated by the composition and quantum confinement effect, while the hydrobromic acid (HBr) addition results in nanosheets (NSs), without a photoluminescence (PL) peak shift. Based on various characteristics, we speculate that the addition of HX leads to protonation of oleylamine from oleylamine into oleylammonium cations that compete with Cs+ during crystallization. The oleylammonium cations at the growing surface of NCs block further growth in the favored direction. Our study provides a facile strategy for tuning and manipulating the shape, size, and optical properties of all-inorganic CsPbX3 NCs and aids in the further exploration of the growth mechanism of perovskite NCs.
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