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oe1(光电查) - 科学论文

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出版时间
  • 2019
研究主题
  • microwave photonics
  • optoelectronic oscillator
  • frequency division
应用领域
  • Optoelectronic Information Science and Engineering
机构单位
  • Jinan University
  • Charles Darwin University
  • University of Ottawa
202 条数据
?? 中文（中国） ▾

  • Accelerated Discovery of Two-Dimensional Optoelectronic Octahedral Oxyhalides via High-Throughput <i>Ab Initio</i> Calculations and Machine Learning

    摘要： Traditional trial-and-error methods are obstacles for large-scale searching of new optoelectronic materials. Here, we introduce a method combining high-throughput ab initio calculations and machine-learning approaches to predict two-dimensional octahedral oxyhalides with improved optoelectronic properties. We develop an effective machine-learning model based on an expansive data set generated from density functional calculations including the geometric and electronic properties of 300 two-dimensional octahedral oxyhalides. Our model accelerates the screening of potential optoelectronic materials of 5000 two-dimensional octahedral oxyhalides. The distorted stacked octahedral factors proposed in our model play essential roles in the machine-learning prediction. Several potential two-dimensional optoelectronic octahedral oxyhalides with moderate band gaps, high electron mobilities, and ultrahigh absorbance coefficients are successfully hypothesized.

    关键词： band gaps,optoelectronic materials,two-dimensional octahedral oxyhalides,absorbance coefficients,electron mobilities,high-throughput ab initio calculations,machine learning

    更新于2025-09-19 17:13:59

  • Transferable High-Quality Inorganic Perovskites for Optoelectronic Devices by Weak Interaction Heteroepitaxy

    摘要： Transferable semiconductors with superior light-emitting properties are important for developing flexible and integrated optoelectronics. However, finding such a qualified candidate remains challenging. Here, we report the fabrication of transferable high-quality CsPbBr3 single-crystals on highly oriented pyrolytic graphite (HOPG) substrate via weak-interaction heteroepitaxy for the first time. Semi-quantitative kinetic analysis based on classical nucleation theory well accounts for the van der Waals (vdW) epitaxial growth process of perovskite on the HOPG substrate. The density functional theory (DFT) calculations illustrate the bonding nature of the interface and predict the Volmer-Weber growth mode in vdW epitaxy, which is consistent with our experimental observations. Importantly, the extremely weak vdW interaction between perovskite and HOPG not only enables the high quality of the crystals, but also endows them with the facile transferability to any foreign substrate by the mechanical exfoliation technique. Leveraging on the transferred CsPbBr3 single-crystals, the low-threshold microlasers and monolithic perovskite light-emitting diode (LED) devices are demonstrated. Our results represent a significant step towards advanced optoelectronic devices relying on the emerging perovskite semiconductors.

    关键词： high quality,optoelectronic devices,heteroepitaxy,Transferable semiconductor,halide perovskite

    更新于2025-09-19 17:13:59

  • Rational Design of Bay-Annulated Indigo (BAI)-Based Oligomers for Bulk Heterojunction Organic Solar Cells: A Density Functional Theory (DFT) Study

    摘要： In this paper, we have designed a series of oligomers based on the donor?acceptor concept. Here, acceptor bay-annulated indigo (BAI) dye and donor N-methyl-4,5-diazacarbazole (DAC) are joined by a thiophene linkage. We have substituted the 5th and 5′th positions of the acceptor unit and the 2nd position of the donor unit with various electron-withdrawing and electron-donating groups to study various structural and electronic properties of the compounds. In this regard, we have calculated the dihedral angle, distortion energy, bond length alteration (BLA) parameters, bang gap (ΔH ? L) values, partial density of states (PDOS), electrostatic potential (ESP) surface analysis, reorganization energy, charge transfer rates, hopping mobility values, and absorption spectra of the compounds. The ESP plots of the compounds indicate signi?cant charge separation in the studied compounds. Our study manifests that the designed compounds are prone to facile charge transport.

    关键词： charge transport,organic solar cells,donor-acceptor,density functional theory,optoelectronic properties

    更新于2025-09-19 17:13:59

  • Crystal Engineering of Organic Optoelectronic Materials

    摘要： Crystal engineering can be regarded as the highly ordered and complicated supramolecular synthesis of functional crystalline solids by control of intermolecular interactions. As one of the most important organic solids for crystal engineering, organic optoelectronic materials have received tremendous interest in the past several decades. In this review, we discuss systematically how to design organic optoelectronic materials from the perspective of crystal engineering including molecular structures, intermolecular interactions, packing arrangements, crystal growth, and patterning methods as well as two-component and multi-component molecular materials. We underline the correlations among molecular structures, packing modes, crystal morphologies, and optoelectronic properties. Finally, we address several key points for further exploration in this field.

    关键词： Crystal Growth,Intermolecular Interactions,Crystal Engineering,Patterning Methods,Organic Optoelectronic Materials,Packing Arrangements

    更新于2025-09-19 17:13:59

  • [IEEE 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Ottawa, ON, Canada (2019.7.8-2019.7.12)] 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Compact transmission-line equivalent circuit model for silicon solar cell simulation

    摘要： We demonstrate a compact equivalent circuit model for transmission-line representation of monocrystalline silicon solar cell. The model for solar cell characterization in terms of impedance/admittance spectroscopy. Number of coordinate partition elements necessary to adequately represent the device characteristics is reasonably comparable with the number of solar cell structure epi-layers. This makes the model convenient for transient effect simulations in external electrical circuits where fully distributed transmission-line model is too complex for direct time-domain calculations.

    关键词： numerical simulation,optoelectronic devices,solar cells,equivalent circuit model,impedance spectroscopy

    更新于2025-09-19 17:13:59

  • [IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Spectroscopic and Structural Properties of Yb <sup>3+</sup> -Doped and Undoped 2D-Mos <sub/>2</sub> Thin Films for Optoelectronic and Photonic Device Applications

    摘要： Molybdenum disulphide (MoS2) has layered structure and is classed as a transition metal-disulphide (TMD) material. Recently it has drawn significant attention for exploring optoelectronic and photonic properties on sub-nanometre scale, with a potential for accessing quantum interactions [1]. The electronic structure and stoichiometry of TMDs make them distinguishable from the metallic graphene, as the TMDs depict a clear bandgap, as in compound semiconductors [2], which is quite attractive for device engineering and applications in photovoltaic, energy storage, and bandgap engineered light-sources [3]. In this research, the fabrication of undoped and Yb3+-ion doped MoS2 nanometre (nm)-scale thin films are discussed using femto-second pulsed laser deposition (fs-PLD) and the structural and spectroscopic properties of fs-PLD are compared with liquid-phase epitaxy grown undoped MoS2 films. Such a comparative analysis may offer materials fabrication platform in future for engineering optoelectronic and photonic devices on silica glass and silicon platforms.

    关键词： DFT,Raman spectroscopy,nonlinear optical properties,Molybdenum disulphide,fs-PLD,photonic devices,Yb3+-doped,optoelectronic,thin films

    更新于2025-09-19 17:13:59

  • Understanding Molecular Adsorption on CuSCN Surfaces Toward Perovskite Solar Cell Applications

    摘要： CuSCN has been employed as the hole transporting material for solar cells and it is established to offer superior power conversion efficiencies and stabilities of the perovskite solar cell. In this manuscript, we carry out first principles calculations to understand the structures and properties CuSCN surfaces in the presence of small molecules that are common in the solution processable solar cells. The molecular adsorbates include additives, precursors and solvents to synthesize the halide perovskite solar cell components such as methylammonium iodide (MAI), lead iodide (PbI2), acetonitrile, chloroform, dimethylformamide (DMF), dimethylsulfoxide (DMSO), methanol and ethanol. The study suggests that the CuSCN surfaces interact with these additive molecules in various degrees and such adsorption is strongly dependent on the CuSCN surface directions. The presence of the PbI2 moiety leads to additional empty states inside the band gap of CuSCN. The presence of the molecular adsorbates impacts on the electronic and optical properties of the CuSCN surfaces, and further additive-based interfacial engineering approach of the perovskite/CuSCN system is called for. This study paves the way toward the fundamental understanding of the CuSCN surfaces toward optoelectronic applications.

    关键词： perovskite solar cells,optoelectronic applications,CuSCN,molecular adsorption,first principles calculations

    更新于2025-09-19 17:13:59

  • Plasmonically enabled two-dimensional material-based optoelectronic devices

    摘要： Two-dimensional (2D) materials, such as graphene, transition metal dichalcogenides, black phosphorus and hexagonal boron nitride, have been intensively investigated as building blocks for optoelectronic devices in the past few years. Very recently, significant efforts have been devoted to the improvement of the optoelectronic performances of 2D materials, which are restricted by their intrinsically low light absorption due to the ultrathin thickness. Making use of the plasmonic effects of metal nanostructures as well as intrinsic plasmon excitation in graphene has been shown to be one of the promising strategies. In this minireview, recent progresses in 2D material-based optoelectronics enabled by the plasmonic effects are highlighted. A perspective on more possibilities in plasmon-assisted 2D material-based optoelectronic applications will also be provided.

    关键词： Transition metal dichalcogenides,Plasmonic effects,Two-dimensional materials,Black phosphorus,Hexagonal boron nitride,Graphene,Optoelectronic devices

    更新于2025-09-19 17:13:59

  • Keratin Film as Natural and Eco‐Friendly Support for Organic Optoelectronic Devices

    摘要： This work describes the preparation of a novel substrate based on keratin extracted from wool and its application as potential support for solution-processed organic solar cells. Optically transparent, free-standing, and resistant keratin films are successfully prepared, starting from water solution, and characterized in terms of morphology, structure, thermal and mechanical properties. The effect of solvents and thermal annealing is also investigated in order to mimic and evaluate the impact of the processing conditions used for devices fabrication. Thermally annealed keratin films exhibit enhanced optical transparency (>87%) in the visible region of the spectrum, a transition from α-helix to β-sheet and turn structures, improved thermal stability and Young’s modulus. The good transparency, flatness, and resistance of as-cast substrates allow the successful preparation of organic solar cells. Photovoltaic performances similar to those reported for other natural/biobased supports are achieved, confirming the potential of keratin film as an alternative and promising support material for eco-friendly, fully printable, sustainable, and inexpensive optoelectronic devices.

    关键词： natural support,optoelectronic devices,eco-friendly systems,keratin film,solution processing

    更新于2025-09-19 17:13:59

  • Machine Learning for Tailoring Optoelectronic Properties of Single-Walled Carbon Nanotube Films

    摘要： A machine learning technique, namely support vector regression, is implemented to enhance single-walled carbon nanotube (SWCNT) thin-film performance for transparent and conducting applications. We collected a comprehensive dataset describing the influence of synthesis parameters (temperature and CO2 concentration) on the equivalent sheet resistance (at 90% transmittance in the visible light range) for SWCNT films obtained by a semi-industrial aerosol (floating-catalyst) CVD with CO as a carbon source and ferrocene as a catalyst precursor. The predictive model trained on the dataset shows principal applicability of the method for refining synthesis conditions towards the advanced optoelectronic performance of multi-parameter processes such as nanotube growth. Further doping of the improved carbon nanotube films with HAuCl4 results in the equivalent sheet resistance of 39 Ω/□ – one of the lowest values achieved so far for SWCNT films.

    关键词： transparent conductive films,support vector regression,single-walled carbon nanotubes,optoelectronic properties,machine learning

    更新于2025-09-19 17:13:59