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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
  • self-organization map
  • photovoltaic equipment
  • probabilistic neural network
  • incremental learning
应用领域
  • Optoelectronic Information Science and Engineering
机构单位
  • Donghua University
17 条数据
?? 中文（中国） ▾

  • Nanostructured Transparent Conductive Electrodes for Applications in Harsh Environments Fabricated via Nanosecond Laser‐Induced Periodic Surface Structures (LIPSS) in Indium–Tin Oxide Films on Glass

    摘要： A self-organization phenomenon named laser-induced periodic surface structures (LIPSS) is utilized for pattern formation in indium–tin oxide (ITO) transparent conductive films coated on borosilicate glass. Stripe patterns with periodicities down to 175 nm are created by scanning the focused beam (30 μm spot diameter 1 e?2) of a nanosecond pulsed laser operating at 532 nm wavelength over ITO films. Highly ordered ITO-LIPSS are generated at a pulse duration of 6 ns, pulse frequencies between 100 and 200 kHz, pulse energies around 20 μJ, and laser spot scan speeds in the range of 50–80 mm s?1. Resulting nanopatterns are electrically conductive and feature improved optical transparency as well as stability against strong acids such as hydrochloric acid, sulfuric acid, and even aqua regia. The formation of mixed phases between ITO and silicon is considered to be the origin for the chemical robustness of laser patterned transparent conductive electrodes.

    关键词： laser-induced periodic surface structures (LIPSS),laser patterning,self-organization,indium–tin oxide (ITO),transparent conductive films (TCF)

    更新于2025-10-22 19:40:53

  • Facile Synthesis and Self-assembly of Zinc (2-Diethoxy-phosphorylethynyl)porphyrins

    摘要： The synthesis of zinc (2-diethoxyphosphorylethynyl)porphyrins and their self-organization in solid state and in solution are reported. Copper-cocatalyzed Sonogashira reaction of bromoporphyrins with diethyl ethynylphosphonate was used to prepare meso-substituted derivatives Zn4 and Zn5 bearing one or two ethynylphosphonate substituents at the macrocycle. In contrast, copper-free Sonogashira coupling of 2-bromoporphyrin with diethyl ethynylphosphonate is more convenient to prepare porphyrin Zn6 bearing this substituent at the b-pyrrolic position of the macrocycle. The structure of complexes Zn4a.C7H8, Zn4a.CHCl3, Zn4c and Zn5b.CH2Cl2 in crystals were elucidated by X-ray diffraction analysis. The supramolecular self-assembly through weak coordinative binding of the phosphoryl group of one porphyrin molecule to the zinc(II) ion located in the center of another macrocyclic cavity is observed in all crystals. However, Zn(II)-porphyrinates Zn4a and Zn5b exist in the solid state as mutually coordinated dimers while complex Zn4c displays a 1D polymer structure. In all dimer complexes, neighboring porphyrin rings are spatially separated, with Zn–O and P=O bond distances being similar, while the interplanar porphyrin distance is variable to depend on weak intermolecular interactions in the crystals. The self-organization of (phosphorylethynyl)porphyrins is also observed in weakly polar chloroform and detectable by NMR and UV-vis spectroscopies. The mutually coordinated dimer of electron-deficient porphyrin Zn5b was observed in 5.x.10-3 M chloroform solution even at room temperature. Kinetic lability of this supramolecular complex was proven by NMR spectroscopy. The associates of more electron-donating porphyrins Zn4a and Zn4c are less stable and self-assembled dimers become the predominant species in 5.x.10-3 M chloroform solution only below 225 K. The self-assembly of porphyrin Zn4a and Zn5b in more diluted solutions (up to 10-6 M) was also investigated by UV-vis spectroscopy.

    关键词： self-organization,phosphonate,porphyrin,catalysis,acetylene linker

    更新于2025-09-23 15:23:52

  • [IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Automatic Forest Extraction Method Based on Self-Organizing Map Algorithm Using Gf-2 Images

    摘要： With more and more high-spatial-resolution images being applied to interpret objects and to extract information, machine learning methods have emerged as solutions for the large amount image data’s processing and analyzing. But how to improve the efficiency and accuracy of interpretation and extraction becomes a problem. For China Geological Survey’s national forest survey project, we proposed an automatic extraction method to extract forest area from high resolution images of GF-2 satellite based on self-organization map (SOM) which is an artificial neural network (ANN) method using unsupervised learning to produce a low-dimensional, discretized representation of the input space of the training samples. Also, the proposed method was applied to three different areas to verify its accuracy. Compared with those of human-computer interactive interpretation, the results of the proposed method had high classification accuracy for extracting forest information.

    关键词： GF-2 satellite,self-organization map,extraction method,Forest,automatic

    更新于2025-09-23 15:22:29

  • Two-Dimensional Conducting Polymers: Synthesis and Charge Transport

    摘要： Current technological advances and prolific endeavors have entrenched two-dimensional conducting polymers as the rapidly emerging interface across a diversity of functional materials for flexible electronics, sensors, ion-exchange membranes, biotechnology, catalysis, energy storage, and conversion. Rational design and fabrication of polymeric nanostructures enriched with well-ordered geometry are appealing and endorse significant impact on their inbuilt electrical, optical, and mechanical properties. In particular, recent interest in controlled hierarchical assembly of monomers/oligomers proved the free-standing sheet-like structures with exotic features of high conductivity and flexibility. Yet, the ongoing research to make nanometer-thick polymers suffers from limitations to access large-area, mechanical stability, and high-range internal ordering. In this perspective, we focus on the radical approaches that highlight confinement-entitled features of two-dimensional polymeric materials correlating to their interface or template-assisted synthesis, structure–property relationship, charge transport properties, and future scopes for relevant practical enactments.

    关键词： 2D assembly,self-organization,conjugated polymers,charge transport,interfacial synthesis

    更新于2025-09-23 15:22:29

  • Self-structuring in Zr1?xAlxN films as a function of composition and growth temperature

    摘要： Nanostructure formation via surface-diffusion-mediated segregation of ZrN and AlN in Zr1?xAlxN films during high mobility growth conditions is investigated for 0 ≤ × ≤ 1. The large immiscibility combined with interfacial surface and strain energy balance resulted in a hard nanolabyrinthine lamellar structure with well-defined (semi) coherent c-ZrN and w-AlN domains of sub-nm to ~4 nm in 0.2 ≤ × ≤ 0.4 films, as controlled by atom mobility. For high AlN contents (x > 0.49) Al-rich ZrN domains attain wurtzite structure within fine equiaxed nanocomposite wurtzite lattice. Slow diffusion in wurtzite films points towards crystal structure dependent driving force for decomposition. The findings of unlikelihood of iso-structural decomposition in c-Zr1?xAlxN, and stability of w-Zr1?xAlxN (in large × films) is complemented with first principles calculations.

    关键词： phase separation,nanostructure,thin films,self-organization,ZrAlN

    更新于2025-09-23 15:21:21

  • Impact of Transient Population Grating on the Superradiant Phase Transition in Semiconductor Laser Structures

    摘要： We study theoretically and experimentally superradiant dynamics in multiple-section GaAs/AlGaAs laser structures. We develop a model based on the one-dimensional Maxwell curl equations without making use of the slowly-varying envelope approximation and demonstrate that strong transient periodic modulation of both e – h density and refractive index drastically affect the dynamics of emission generation in semiconductor media. We show that the coherent λ/2 transient population and the relative permittivity gratings facilitate e – h self-ordering and the onset of the superradiant phase transition in the e – h system.

    关键词： self-organization,superradiance,phase transition,population grating

    更新于2025-09-23 15:21:01

  • Alkyl Side-Chain Dependent Self-Organization of Small Molecule and its Application in High-Performance Organic and Perovskite Solar Cells

    摘要： The molecular self-organization of organic semiconductors, which is mainly determined by the structural design, film processing, and device configuration, is one of the crucial factors for achieving high-performance organic photovoltaics (OPVs) and perovskite solar cells (PvSCs). In this study, we newly synthesized and developed strongly self-organized small molecules via alkyl side-chain engineering. Replacing “H” to “C6H13” on the thienyl group, SM2 showed a well-ordered face-on orientation. Due to favorable self-organization leading to effective charge carrier dynamics, including enhanced charge transfer/transport and suppressed recombination, SM2-based OPVs and PvSCs exhibited improved device performance compared to the devices based on SM1 without an additional hexyl side-chain. The best fullerene-based OPV and planar PvSC with SM2 as a small-molecule donor and as a hole transport layer (HTL) achieved an unprecedentedly high efficiency of 9.38% and 20.56%, in contrast with SM1-based devices showing lower efficiency of 8.70% and 15.37%. Furthermore, the planar PvSCs based on undoped-SM2 HTL exhibited comparable efficiency but provided excellent heat and humidity stability compared with doped spiro-OMeTAD-based devices. These results clearly indicated that SM2 with highly-ordered and favorable self-organization is a promising organic semiconductor for future applications of high-performance organic and inorganic-organic hybrid electronics.

    关键词： small molecule,organic photovoltaics,alkyl side-chain,self-organization,perovskite solar cells

    更新于2025-09-23 15:19:57

  • Making Permanent Optical Matter of Plasmonic Nanoparticles by in Situ Photopolymerization

    摘要： Laser-induced self-organization of colloidal metal nanoparticles holds great promise in building artificial photonic structures, yet the self-organized nanoparticles (i.e., optical matter) disassemble immediately without the optical field. Here we report an approach for in situ construction of permanent mesoscale structures from optically bound nanoparticles. Metal nanoparticles are trapped by optical tweezers and self-organize into various optical matter structures, which are selectively immobilized by photocurable hydrogels upon additional UV light illumination. Making permanent optical matter of plasmonic nanoparticles will benefit bottom-up assembly of photonic materials and devices.

    关键词： photopolymerization,plasmonic nanoparticles,optical tweezers,self-organization,optical matter

    更新于2025-09-19 17:13:59

  • Epitaxial n++-InGaAs ultra-shallow junctions for highly scaled n-MOS devices

    摘要： High electron mobility III-V semiconductors like InGaAs are excellent candidates for sub-10 nm n-metal-oxide-semiconductor (nMOS) devices. One of the critical challenges in downscaling III-V devices is achieving low-resistance contacts by forming low-defect, ultra-shallow junctions < 9 nm in depth, with n-type dopant concentrations above 1019 cm?3. In the current study, we combine time-of-flight secondary ion mass spectrometry (ToF-SIMS) depth profile analysis, atomic force microscopy (AFM) imaging, and high-resolution transmission electron microscopy (HR-TEM) to determine the optimal doping strategy for growing Si-doped n++-In0.25Ga0.75As ultra-shallow junctions by molecular beam epitaxy. We test three different approaches to doping: homogeneous co-deposition, single δ-layer (continuous) doping, and triple δ-layer (pulsed) doping. We demonstrate the formation of technologically suitable n++-In0.25Ga0.75As junctions 5–7 nm deep, grown under As-rich conditions with a single δ-layer at temperatures as low as 400 °C. These junctions have peak Si concentrations between 6 × 1019 and 1 × 1020 cm?3 and high crystal quality. The surface self-organizes into smooth ripples or mounds, up to a peak dopant concentration of ~2 × 1020 cm-3. Above this value, enhanced diffusion of Si and In due to a large population of Ga vacancies increases lattice strain in the semiconductor epilayer, triggering a transition from 2D growth to 3D growth and the formation of In0.85Ga0.15As clusters on the surface.

    关键词： Time-of-flight secondary ion mass spectrometry,Indium gallium arsenide,Semiconductor growth,Ultra-shallow junctions,Self-organization,Solid-state diffusion

    更新于2025-09-19 17:13:59

  • [IEEE IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium - Yokohama, Japan (2019.7.28-2019.8.2)] IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium - Structural Optimization of Receiving System Based on Optimal Field of View for Shallow Sea Laser Measurement

    摘要： Recently, mobile networking systems have been designed with more complexity of infrastructure and higher diversity of associated devices and resources, as well as more dynamical formations of networks, due to the fast development of current Internet and mobile communication industry. In such emerging mobile heterogeneous networks (HetNets), there are a large number of technical challenges focusing on the efficient organization, management, maintenance, and optimization, over the complicated system resources. In particular, HetNets have attracted great interest from academia and industry in deploying more effective solutions based on artificial intelligence (AI) techniques, e.g., machine learning, bio-inspired algorithms, fuzzy neural network, and so on, because AI techniques can naturally handle the problems of large-scale complex systems, such as HetNets towards more intelligent and automatic-evolving ones. In this paper, we discuss the state-of-the-art AI-based techniques for evolving the smarter HetNets infrastructure and systems, focusing on the research issues of self-configuration, self-healing, and self-optimization, respectively. A detailed taxonomy of the related AI-based techniques of HetNets is also shown by discussing the pros and cons for various AI-based techniques for different problems in HetNets. Opening research issues and pending challenges are concluded as well, which can provide guidelines for future research work.

    关键词： ant colony optimization,self-organization networks,heterogeneous networks,genetic algorithms,Artificial intelligence

    更新于2025-09-19 17:13:59