RSC Advances
·
2016
·Vol. 6
·期 74
·70452-70459
·
IF 3.289
Makkawi Osman,Yanmin Huang,Wei Feng,Guangbo Liu,Yunfeng Qiu,PingAn Hu
Phase engineering of two-dimensional (2D) materials offers unique opportunities for acquiring novel opto-electronic properties and allows for the searching of outstanding candidates for applications in opto-electronic detectors, sensors, catalysis, or phase-change memory devices. Here, we report the phase-transformation from β-InSe to γ-In2Se3, exploiting the thermal annealing route to trigger the process starting at 200 °C that expands the family of phase-change materials. The presence of γ-In2Se3 is solidly confirmed by the characteristic peaks in X-ray diffraction (XRD) and energy dispersive X-ray (EDX), and is quite stable at ambient condition, thus facilitating substantial application in phase-change memory devices. A Raman shift in the A′1 mode from 225 cm−1 to 230 cm−1 further illustrates the phase transformation. Besides the photoluminescence (PL) peak of β-InSe, the ∼2 eV PL peak, ascribed to γ-In2Se3, is observed in the annealed nanosheet. The increased PL band gap of β-InSe as a function of annealing temperature during phase transformation was possibly affected by the suppressed interlayer coupling, as well as the planar quantum confinement of photo-excited carriers by the external surfaces of the sheets. The photodetector performance with respect to photocurrent, mobility, detectivity, responsivity, and external quantum efficiency was subsequently evaluated after thermal annealing, showing deteriorated optical performance. The present work proved that thermal annealing could induce the successful phase transformation, and adjusted the opto-electronic properties in some extent, providing useful information for processing 2D materials based nano-devices.
研究领域:
材料科学
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光学工程
·
纳米技术
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产品关联
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2025
·
IF 4.5
Chunfang Wang,Yining Wang,Faqiong Zhao,Baizhao Zeng
Organic-inorganic composite photoactive materials can combine the merits of organic and inorganic components and show better performance in comparison with single-component materials. In this work, a novel photoactive material was synthesized through chemical polymerization of 3,4-ethylenedioxythiophene (EDOT) on the surface of hydrothermally prepared Bi 2 WO 6 , followed by modification of self-polymerized dopamine (PDA). The integration of poly(3,4-ethylenedioxythiophene) (PEDOT) and Bi 2 WO 6 effectively facilitated the separation of photogenerated electron-hole pairs, thus demonstrated substantially strong photoelectrochemical signal compared to pure Bi 2 WO 6 . The PDA film, with abundant functional groups, could further sensitize the material and facilitate the immobilization of recognition units. As a proof of application, the composite was combined with carcinoembryonic antibody to construct an immunosensor for carcinoembryonic antigen sensing. Resultantly, although the components and construction procedure were simple, the prepared sensor demonstrated a broad linear detection range of 0.001–20 ng/mL and a relative low detection limit of 0.50 pg/mL. It also showed high selectivity and stability. Its practical feasibility was confirmed by detecting real samples and yielding satisfactory results.
研究领域:
生物医学工程
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分析化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Xiaolei Li,Bochao Li,Jianhui Chang,Bin Ding,Shuaizhi Zheng,Yiwei Wu,Junliang Yang,Guanjun Yang,Xiangli Zhong,Jinbin Wang
The toxicity and the instability of lead-based perovskites might eventually hamper the commercialization of perovskite solar cells. Here, we present the optoelectronic properties and stability of a two-dimensional layered (C6H5CH2NH3)2CuBr4 perovskite. This material has a low Eg of 1.81 eV and high absorption coefficient of ∼1 × 105 cm–1 at the most intensive absorption at 539 nm, implying that it is suitable for light-harvesting in thin film solar cells, especially in tandem solar cells. Furthermore, X-ray diffraction (XRD), ultraviolet–visible (UV–vis) absorption spectra, and thermogravimetric analysis (TGA) confirm the high stability toward humidity, heat, and ultraviolet light. Initial studies produce a mesoscopic solar cell with a power conversion efficiency of 0.2%. Our work may offer some useful inspiration for the further investigation of environment-friendly and stable organic–inorganic perovskite photovoltaic materials.
研究领域:
材料科学
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光伏技术
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能源研究
✓ 已验证
产品关联
DOI
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 15
·7502-7506
·
IF 5.968
Hechun Jiang,Pengcheng Dai,Zhenyu Feng,Weiliu Fan,Jinhua Zhan
Cu2ZnSnS4 (CZTS) is acknowledged as an alternative to traditional p-type semiconductors. Traditionally obtained CZTS, however, is mostly kesterite or stannite phase, which features a tetragonal crystal cell. Herein, novel orthorhombic CZTS has been synthesized via an ethylenediamine-assisted hydrothermal method. Ethylenediamine plays an important part in the construction of the orthorhombic phase. Kesterite CZTS was also obtained in an ultrapure water system without ethylenediamine. The structure was confirmed by XRD, XPS and HRTEM. The band gap of the orthorhombic CZTS is about 1.45 eV, which approaches the optimum value for solar photoelectric conversion. What's more, we found that this orthorhombic CZTS is metastable. After annealing at 500 °C, a phase transformation from the orthorhombic structure to the tetragonal kesterite structure was achieved. The photoelectric response was also characterised, which demonstrated its potential for application in photovoltaic devices.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 7
·985
·
IF 2.67
Yuhan Feng,Yumin Zhang,Jipeng Liu,Ye Zhang,Yongshuai Xie
Due to its high thermal and chemical stability, excellent dielectric properties, unique optical properties, corrosion resistance, and oxidation resistance, the two-dimensional hexagonal boron nitride (h-BN) is often used in a thermal conductor protective layer in deep ultraviolet light-emitting detector fields. However, due to the complicated growth conditions of h-BN, it is often necessary to prepare h-BN by the CVD method in a high vacuum environment, which is limited to a certain extent in terms of film size and production cost. In order to solve this problem, we proposed a method to prepare h-BN thin films by atmospheric CVD (APCVD). This method does not need a vacuum environment, which reduces energy consumption and cost, and makes the operation simpler and the experimental environment safer. The preparation of high-quality h-BN film was carried out using a Cu-Ni alloy as the growth substrate. The growth process of h-BN film was studied, and the influence of growth parameters on the structure of the h-BN film was explored. The morphological features and elemental composition pairs of the samples were characterized and analyzed, which confirmed that the high-quality h-BN film could be successfully grown on the Cu-Ni alloy substrate by APCVD. The UV detection device prepared by using the prepared h-BN film as the photoresponse material had good photoresponse characteristics and performance stability. It provides a new idea for the low-cost preparation of large-scale h-BN.Keywords:APCVD;h-BN;film;photoelectric devices
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Xinrui Cheng,Guoqiang Xi,Yue-Wen Fang,JiaQi Ding,Jianjun Tian,Linxing Zhang
Ferroelectric thin films with switchable polarization and anomalous photoelectric effects have received extensive attention recently. However, the improvement of photoelectric performance is accompanied by the weakening of ferroelectricity . Here, both chemical and interlayer design are used to regulate the polarization and optical properties of BiFeO 3 -based ferroelectric films. We achieved an improvement in both ferroelectricity and bandgap by chemical composition. The remanent polarization has been enhanced to 73.8 μC/cm 2 from 0.2 μC/cm 2 , ascribed to the structural transition. The band gap of Eu-BiFeO 3 films has been reduced to 2.23 eV from 2.42 eV due to the unique energy level from Eu 4 f , indicating the enhanced visible-light-absorbing capability. We have designed a "sandwich" interfacial structure of homogeneous Eu-BiFeO 3 films. A clever combination between optimal ferroelectricity and narrow band gap with near Eu contents of BFO films would generate an interfacial layer with a homogeneous gradient component, which should favor the switching of ferroelectric domains. The results show that the remanent polarization improved by 17 % to 86.2 μC/cm 2 while the band gap has also improved. Intriguingly, the short-circuit current density ( J sc ) and open circuit ( V oc ) of the photovoltaic signal of the optimal films are 89.0 nA and 0.412 V, respectively. This provides a simple and intelligent way to design the ferroelectric-photoelectric thin films and lays the foundation for optical information storage devices.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
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2017
·
IF 1.405
Zhijie Ma,Sun Peng,Yihui Wu,Xiang Fang,Xin Chen,Xuguang Jia,Kezhi Zhang,Ningyi Yuan,Jianning Ding,Ning Dai
Metal halide perovskites are newcomer optoelectronic materials that have attracted enormous attention and single crystal offers better stability and optical electronic performance. In this background, a lead-free, air-stable, effective material of bismuth halide perovskite is highly sought-after. Herein, millimeter-scale single-crystal A 3 Bi 2 I 9 (A = Cs + or methylammonium (MA + )) perovskites were synthesized via a facile hydrothermal approach and characterized by various means. Raman spectroscopy results in a layered cleavage distribution. Spin-coating of these compounds produced thin films with uniform surface morphologies , high carrier mobility and superior stabilities. Trivalent-bismuth-based materials were used as the photoactive layer in solution-processed heterojunction solar cell devices, which is a conceptual beneficial exploration and yield power conversion efficiencies of ~ 0.2%.
研究领域:
材料科学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2022
·
IF 3.407
Peng Chen,Xin Shan,Xin Lin,Heyan Yuan,Yangyang Xie,Fang Wang,Kailiang Zhang
Bi 2 O 2 Se has attracted a lot of attention in the field of photodetection due to its ultra-high mobility and tunable band gap. However, the mechanism of controllable preparation of high-quality Bi 2 O 2 Se is unclear and needs further investigation. In this paper, the concentration of reactants in the substrate region was increased by the method of space-compression, the number of nucleation was effectively controlled, and larger size Bi 2 O 2 Se was obtained. And the nucleation and selenylation mechanisms of Bi 2 O 3 were revealed based on the effect of temperatures modificatives growth of Bi 2 O 2 Se. And the controlled growth was achieved in a certain thickness range by increasing the reactant concentration in the substrate region and controlling the nucleation number. Moreover, photodetectors were constructed based on the highly crystalline Bi 2 O 2 Se. The photodetector exhibited a photoresponsivity of up to 9550 A/W under the excitation of 405 nm light and obtained highly stable and recoverable characteristics with multiple laser switches.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuaifei Mao,Jiantong Ge,Lingling Zhang,Yannan Dai,Sheng Jiang,Yafei Chen,Chunli Jiang,Chunhua Luo,Bobo Tian,Hechun Lin,Hui Peng,Chun-Gang Duan
The advent of artificial photoelectric synapse devices has attracted considerable attention due to their potential to reshape the landscape of neuromorphic computing. A critical challenge impeding their wider application is the typically short image retention time these devices exhibit. In this study, a strategy is developed to address this obstacle by combining the formation of heterojunction and defect-trapping effects. A Cu 2 ZnSnS 4 (CZTS) film is prepared via low-temperature annealing to form a type II heterojunction with ZnO . The two-terminal device based on this heterojunction shows excellent synaptic functionality. The wide absorption of CZTS film in the visible light spectrum enables the device to achieve a broadband response, which is crucial for realizing the simulation of Pavlov’s associative memory. Its utility in encoding encrypted information is demonstrated through the capability to simulate Morse code. Most importantly, the device exhibits image memory for periods exceeding 1100 s, highlighting its exceptional performance in visual memory retention. These results contribute to the development of CZTS-based photoelectric synaptic devices with broad response characteristics and non-volatile memory capabilities.
研究领域:
材料科学
·
神经形态计算
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光电技术
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Ronghuan Liu,Bihua Hu,Kai Wang,Baomin Xu,Xiao Wei Sun
Compared with polycrystalline thin films, perovskite single crystals without grain boundaries have better photovoltaic performance and stability. However, due to the extremely low solubility of all-inorganic perovskite in organic solvents and the complex phase diagram of CsPbBr3, directly growing large-sized CsPbBr3 perovskite single-crystal wires is challenging. Here, we have developed an airflow-assisted growth method for the rapid synthesis of large quantities of high-quality, dispersed, ultralong CsPbBr3 single-crystal wires under ambient conditions. This method is green (no additives) and low cost (no special treatment). The growth kinetics of single-crystal wires using this method have been elucidated, and their structural and optoelectronic properties were characterized. Some of the CsPbBr3 single-crystal wires synthesized by this method can exceed 1 mm in length with a low trap density of about 9.06 × 1011 cm–3. The constructed photodetector responsivity is up to 0.365 A/W and detectivity is over 3.3 × 1013 Jones, indicating great potential for optoelectronic applications. This low-cost, high-quality all-inorganic CsPbBr3 single-crystal wire growth method is highly scalable and may facilitate the research and application of all-inorganic perovskite single crystals.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2022
·Vol. 6
·期 6
·2101019
·
IF 9.173
He Wang,Xi Zhang,Yali Ma,Mengke Wang,Jun Wang
2D hybrid halide-layered perovskites have been compelling candidates for photovoltaics and optoelectronics owing to their remarkable electrical and optical properties. However, high-quality crystals are usually obtained either through complicated and energy-consuming procedures or using toxic solvents, which remains a significant challenge to the crystal synthesis. To address the issue, a facile, universal, ecofriendly, and energy-saving approach to synthesize the Ruddlesden−Popper- and Dion−Jacobson-phase 2D-layered potassium-passivated perovskites at room temperature is reported. By involving potassium iodide to the reaction, potassium ions can assist both the crystal growth and surface passivation, improving their stability and passivated trap states. Potassium-passivated (R-MBA) 2 PbI 4 exhibits superior optoelectronic features than pristine (R-MBA) 2 PbI 4 as well as outstanding strain stability. The findings herein may not only improve synthetic methods to obtain high-quality crystals, but also motivate more fundamental investigations for potential optoelectronic and flexible applications.
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Yingnan Yang,Dongxue Wu,Zhen Zhang,Wei Cao,Xiaochong Zhao,Yawei Hao,Pan Yang,Jingchuan Wang
A simple and rapid method, temperature rising and crystallization, has been used to synthesis single crystals of inorganic perovskite CsPbBr x I (3-x) , which have higher stability than organic perovskite materials. It is indicated that CsPbBr x I (3-x) single crystals have good shape and thermal stability, and the thermal stability is better with the iodine content increases. Increase of iodine element reduces the impurities doping and improves the purity of the single crystal. The results show a great potentially high performance for optoelectronic devices.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）