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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • electron-transparent membranes
  • micropump
  • field emission electron source
  • ion source
  • ion mobility spectrometry
应用领域
  • Optoelectronic Information Science and Engineering
机构单位
  • Wroclaw University of Science and Technology
209 条数据
?? 中文（中国） ▾

  • Improving the Electron Mobility of ITIC by End-Group Modulation: The Role of Fluorination and π-Extension

    摘要： Nonfullerene organic solar cells (OSCs) using ITIC derivatives as electron acceptors have achieved power conversion efficiencies up to 14%, yet optimal active-layer thicknesses are still limited to (cid:1)100 nm, ascribed mainly to the (cid:3)4 cm2/Vs) of these acceptors. Because of the large steric hindrance of the bulky side chains on the fused-ring core, ITIC favors a local π–π stacking between the electron-withdrawing end groups (IC), which provides the main electron transport channel across the bulk volume. Here, the influence of different fluoro-substituted and π-extended (i.e., benzene-fused) positions in the phenyl moiety of IC on the electron transport properties is systematically investigated by multiscale theoretical simulations. It is found that the electron mobility can be remarkablely improved by proper fluorination and π-extension, especially by π-extension, due to the lower reorganization energy and stronger end-group π-π interaction. Moreover, a judicious combination of π-extension and fluorination can lead to a nearly six-fold increase of the electron mobility with respect to ITIC. This work shows that the electron mobility of A-D-A nonfullerene acceptors can be effectively improved by end-group engineering, paving the way toward higher-performance organic solar cells.

    关键词： electron mobility,molecular packing,nonfullerene acceptor,end-group engineering

    更新于2025-09-23 15:21:01

  • On-demand tuning of charge accumulation and carrier mobility in quantum dot solids for electron transport and energy storage devices

    摘要： Assemblies of colloidal quantum dots (CQDs) are attractive for a broad range of applications because of the ability to exploit the quantum con?nement effect and the large surface-to-volume ratio due to their small dimensions. Each application requires different types of assemblies based on which properties are intended to be utilized. Greater control of assembly formation and optimization of the related carrier transport characteristics are vital to advance the utilization of these materials. Here, we demonstrate on-demand control of the assembly morphology and electrical properties of highly crosslinked CQD solids through the augmentation of various assembly methods. Employment of electric-double-layer (EDL) gating on these assembly structures (i.e., an amorphous assembly, a hierarchical porous assembly, and a compact superlattice assembly) reveals their intrinsic carrier transport and accumulation characteristics. Demonstrations of high electron mobility with a high current modulation ratio reaching 105 in compact QD ?lms and of a record-high areal capacitance of 400 μF/cm2 in an electric-double-layer supercapacitor with very thin (<100 nm) QD hierarchical porous assemblies signify the versatility of CQDs as building blocks for various modern electronic devices.

    关键词： electron transport,electric-double-layer gating,energy storage devices,carrier mobility,colloidal quantum dots

    更新于2025-09-23 15:21:01

  • Sa?ˉCl intramolecular interaction: An efficient strategy to improve power conversion efficiency of organic solar cells

    摘要： Noncovalent conformational locks (NCLs) including S···N, Se···O, and S···O etc. have been an effective strategy to improve the planarity and rigidity, and charge transport mobility of organic/polymeric semiconductors. Herein, by replacing methyl group (ITMIC) with chlorine (ITCIC) in the π-bridge, the planarity and rigidity of the π-conjugated skeleton was enhanced by introduction of S···Cl NCLs, thus the charge transport mobility was improved accordingly. As a result, PM6:ITCIC based organic solar cells showed impressive PCE of 11.34%, much higher than that based on PM6:ITMIC. This contribution demonstrated a novel kind NCLs (S···Cl) for improving the performance of organic solar cells.

    关键词： noncovalent conformational locks,organic solar cells,non-fullerene acceptor,charge transport mobility

    更新于2025-09-23 15:21:01

  • Synergistic Cascade Carrier Extraction via Dual Interfacial Positioning of Ambipolar Black Phosphorene for Higha??Efficiency Perovskite Solar Cells

    摘要： 2D black phosphorene (BP) carries a stellar set of physical properties such as conveniently tunable bandgap and extremely high ambipolar carrier mobility for optoelectronic devices. Herein, the judicious design and positioning of BP with tailored thickness as dual-functional nanomaterials to concurrently enhance carrier extraction at both electron transport layer/perovskite and perovskite/hole transport layer interfaces for high-efficiency and stable perovskite solar cells is reported. The synergy of favorable band energy alignment and concerted cascade interfacial carrier extraction, rendered by concurrent positioning of BP, delivered a progressively enhanced power conversion efficiency of 19.83% from 16.95% (BP-free). Investigation into interfacial engineering further reveals enhanced light absorption and reduced trap density for improved photovoltaic performance with BP incorporation. This work demonstrates the appealing characteristic of rational implementation of BP as dual-functional transport material for a diversity of optoelectronic devices, including photodetectors, sensors, light-emitting diodes, etc.

    关键词： ambipolar carrier mobility,cascade interfacial carrier extraction,black phosphorene,perovskite solar cells,band energy alignment

    更新于2025-09-23 15:21:01

  • [IEEE 2018 IEEE 5G World Forum (5GWF) - Silicon Valley, CA, USA (2018.7.9-2018.7.11)] 2018 IEEE 5G World Forum (5GWF) - 5G NR Coverage, Performance and Beam Management Demonstrated in an Outdoor Urban Environment at 28 GHz

    摘要： This paper investigates the behaviour of a 28 GHz Massive MIMO 5G new radio (NR) test system operating with 400 MHz bandwidth and one transmission/reception point in a semi-open urban environment. Single-user multiple-input multiple-output (MIMO) performance was evaluated in terms of coverage and propagation. For the considered test area reflections improved the channel conditions. The peak throughput was 6.2 Gbps in line-of-sight corresponding to 15.5 bps/Hz. One transmission/reception point was found to be sufficient to provide good coverage. Furthermore, significant multi-user MIMO gains – often more than 60% for the (median) system downlink throughput – were demonstrated with two users and beam forming with beam tracking in a single cell. This further demonstrates the capacity benefits from beam forming.

    关键词： coverage,multiuser MIMO,mobility,beam tracking,5G,beamforming

    更新于2025-09-23 15:21:01

  • [IEEE ESSDERC 2018 - 48th European Solid-State Device Research Conference (ESSDERC) - Dresden, Germany (2018.9.3-2018.9.6)] 2018 48th European Solid-State Device Research Conference (ESSDERC) - Gated Four-Probe Method to Evaluate the Impact of SAM Gate Dielectric on Mobility in MoS2 FET

    摘要： This study reports the interfacial engineering by means of SAM (Self-assembled monolayer)-based gate dielectric on channel mobility in molybdenum disulfide (MoS2) field-effect transistors (FETs). A gated four-probe method was implemented to eliminate the effect of contact resistance on channel mobility. The formation of SAM significantly plays an important role in the improvement of channel mobility as high as 19 cm2/Vs in MoS2 FETs because the superior interfacial properties can be realized in MoS2/SAM structure. This study opens up interesting direction of interface engineering for research in the applications and developments of 2-dimensional materials-based thin film devices.

    关键词： FETs,Interface properties,Channel mobility,Self-assembled monolayer,MoS2

    更新于2025-09-23 15:21:01

  • Discrete-Pulsed Current Time Method to Estimate Channel Thermal Resistance of GaN-Based Power Devices

    摘要： A simple electrical method to extract device channel thermal resistance in transistors is presented here. The method compares the dc to discrete-pulsed characteristics and estimates the effective increase in channel temperature under dc biasing conditions. Using the discrete-pulsed I versus t method, the self-heating of the device is effectively eliminated, which helps avoiding the underestimation of the device channel thermal resistance, therefore, making it possible to perform thermal measurements at the high power operation. This technique was applied to lateral GaN HEMTs with three different substrates as well as vertical GaN current aperture vertical electron transistor (CAVET) on sapphire, which proved its sensitivity and validity for different device structures and geometries.

    关键词： high-electron mobility transistors (HEMTs),self-heating,current aperture vertical electron transistor (CAVET),Channel thermal resistance

    更新于2025-09-23 15:21:01

  • Null Exciton Splitting in Chromophoric Greek Cross?(+) Aggregate

    摘要： Exciton interactions in molecular aggregates play a crucial role in tailoring the optical behaviour of p-conjugated materials. Though vital for optoelectronic applications, ideal Greek cross-dipole (a = 908) stacking of chromophores remains elusive. We report a novel Greek cross (+) assembly of 1,7-dibromoperylene-3,4,9,10-tetracarboxylic tetrabutylester (PTE-Br2) which exhibits null exciton coupling mediated monomer-like optical characteristics in the crystalline state. In contrast, nonzero exciton coupling in X-type (a = 70.28, PTE-Br0) and J-type (a = 08, q = 48.48, PTE-Br4) assemblies have perturbed optical properties. Additionally, the semi-classical Marcus theory of charge-transfer rates predicts a selective hole transport phenomenon in the orthogonally stacked PTE-Br2. Precise rotation angle dependent optoelectronic properties in crystalline PTE-Br2 can have consequences in the rational design of novel p-conjugated materials for photonic and molecular electronic applications.

    关键词： crystal engineering,chromophore aggregate,fluorescence,charge mobility,exciton splitting

    更新于2025-09-23 15:21:01

  • [IEEE 2019 6th International Conference on Systems and Informatics (ICSAI) - Shanghai, China (2019.11.2-2019.11.4)] 2019 6th International Conference on Systems and Informatics (ICSAI) - Tunnel Section Extraction and Deformation Analysis Based on Mobile Laser Scanning

    摘要： Being a key computing element in cloud data center, virtual machines should be able to migrate from one location to another to meet the requirements of the cloud users and the defined policies of the cloud computing system. The mobility is an important issue when a virtual machine migrates across IP subnets. This paper focuses on the mobility management in cloud computing systems, and proposes a mobility-oriented cloud data center network architecture based on the identity/locator decoupling method of the mobility-driven networks. In cloud data center network, a mobile node refers to a virtual machine, and the mobility behavior mainly refers to virtual machine migration. In the proposed architecture, a virtual machine could implement live migration between IP subnets without service interruption. The evaluation shows that the proposed scheme can solve mobility issues effectively in virtual machine migration among IP subnets.

    关键词： mobility-driven networks (MDN),Virtual machine migration,mobility management,cloud data center network

    更新于2025-09-23 15:19:57

  • Evaluating intrinsic mobility from transient terahertz conductivity spectra of microcrystal samples of organic molecular semiconductors

    摘要： In microcrystal samples of the prototypical organic molecular semiconductors rubrene and C10-DNTT (2,9-didecyl-dinaphtho[2,3-b:20,30-f]thieno[3,2-b]thiophene), we measured spectra of complex optical conductivity caused by photocarriers with optical-pump terahertz-probe spectroscopy. We analyzed the ~r xe T spectra using the Drude-Smith model and evaluated the DC mobility lDC, which includes extrinsic effects, and the intrinsic mobility lint. The resulting lDC and lint values are comparable to the mobility values obtained using transport measurements of polycrystalline and single-crystalline ?eld-effect transistors, respectively. This correspondence demonstrates that the intrinsic mobility values of organic molecular semiconductors can be evaluated from the measurements of microcrystal samples using transient terahertz spectroscopy.

    关键词： mobility,C10-DNTT,organic molecular semiconductors,terahertz spectroscopy,rubrene

    更新于2025-09-23 15:19:57