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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
  • photovoltaic power generation system
  • sensitivity analysis
  • Monte Carlo
  • fuzzy layering evaluation method
应用领域
  • Electrical Engineering and Automation
机构单位
  • Xi’an Jiaotong University
798 条数据
?? 中文（中国） ▾

  • Operating regimes and contact resistance of side-bonded contacts to thin heavily doped semiconductor nanowires

    摘要： In many nano-wire (NW) devices and during NW characterization, the contact is bonded on the surface or the side of the NW. The prior model of such side-bonded contacts assumes partial NW depletion and purely radial tunneling, both restricted to the contacted region. However, the real space-charge extends to the non-contacted NW, aided by the fringing field, and depletes the contacted NW fully for small NW radius, R. In addition, there are non-radial tunneling and generation-recombination near the contact edge. Supported by numerical calculations, the present work shows that when all the effects are included, different regimes of operation manifest in a side-bonded contact, and the space-charge and contact resistance can differ widely from prior predictions. Our calculations span contacts with barrier height, fb0 = 0.4–0.8 V on n-type silicon NWs of R = 7.5–20 nm and doping Nd = 1018–1020 cm?3 and include the effects of dielectric confinement, NW length, surface defects, image force barrier lowering, and heavy doping. We find that a side-bonded contact gets fully depleted at the contact edge for Nd (cid:1) αFD[4εsψ0=qR2], where ψ0 = contact potential and αFD = 0.73 (0.88) for air (SiO2) ambient. Furthermore, the behavior of a side-bonded contact approaches that of an end-bonded contact for Nd (cid:1) αEB[4εsψ0=qR2], where αEB = 0.16 (0.30), while surface space-charge widths in the two contacts match over a much wider Nd range for SiO2 ambient. We express the radial depletion width in the NW as an explicit function of the contact potential based on an available implicit relation.

    关键词： side-bonded contact,contact resistance,tunneling,generation-recombination,space-charge,nano-wire

    更新于2025-09-10 09:29:36

  • Enhanced thermoelectric properties of InSb: Studies on In/Ga doped GaSb/InSb crystals

    摘要： In/Ga elements were doped in GaSb/InSb crystals respectively, and their thermoelectric performances were studied. The crystals had cubic zinc blende structure with change in lattice parameters. The charge transfer occurred between all the three (In, Ga and Sb) elements when In was doped with GaSb. Whereas in Ga doped InSb crystals, the charge transfer occurred only among Ga and Sb elements. In/Ga doped GaSb/InSb crystals exhibited degenerate and non-degenerate electrical properties, respectively. Optical modes of phonon vibrations were present, and their transverse mode was dominant over longitudinal mode in all the samples. The thermoelectric ?gure of merit (ZT) of In doped GaSb crystals were low because of their low power factor and high thermal conductivity. The highest power factor (59.5 μW/cmK2) and ZT (0.56) at 573 K were achieved by Ga doped (1 × 1021/cm3) InSb crystal. The ZT 0.56 at 573 K is thus far the highest among other reported values of InSb crystals.

    关键词： D. Point defect,B. Thermoelectric properties,A. Intermetallics,C. Crystal growth,G. Thermoelectric power generation

    更新于2025-09-10 09:29:36

  • A Material for Difference-Frequency Generation of Terahertz Radiation

    摘要： The possibility of efficient difference-frequency generation of terahertz radiation in a metamaterial representing a structure consisting of alternating layers of a semiconductor materials exhibiting intrinsic or metallic conductivity that can be grown by epitaxial methods is investigated theoretically.

    关键词： terahertz radiation,metamaterial,epitaxial methods,difference-frequency generation,semiconductor

    更新于2025-09-10 09:29:36

  • Electronic wavefunctions probed by all-optical attosecond interferometry

    摘要： In photoelectron spectroscopy, the ionized electron wavefunction carries information about the structure of the bound orbital and the ionic potential as well as about the photoionization dynamics. However, retrieving the quantum phase information has been a long-standing challenge. Here, we transfer the electron phase retrieval problem into an optical one by measuring the time-reversed process of photoionization—photo-recombination—in attosecond pulse generation. We demonstrate all-optical interferometry of two independent phase-locked attosecond light sources. This measurement enables us to directly determine the phase shift associated with electron scattering in simple quantum systems such as helium and neon, over a large energy range. Moreover, the strong-field nature of attosecond pulse generation resolves the dipole phase around the Cooper minimum in argon through a single scattering angle. This method may enable the probing of complex orbital phases in molecular systems as well as electron correlations through resonances subject to strong laser fields.

    关键词： all-optical interferometry,electron correlations,photoelectron spectroscopy,Cooper minimum,molecular systems,electron scattering,attosecond pulse generation,quantum phase information

    更新于2025-09-10 09:29:36

  • Single Crystal Growth and Characterization of the Chalcopyrite Semiconductor CuInTe2 for Photoelectrochemical Solar Fuel Production

    摘要： Transition metal chalcogenides are a promising family of materials for applications as photocathodes in photoelectrochemical (PEC) H2 generation. A long-standing challenge for chalcopyrite semiconductors is characterizing their electronic structure—both experimentally and theoretically—due to their relatively high energy bandgaps and spin orbit coupling (SOC), respectively. In this work, we present single crystals of CuInTe2, whose relatively small optically measured bandgap of 0.9 ± 0.03 eV enables electronic structure characterization by angle-resolved photoelectron spectroscopy (ARPES) in conjunction with first-principle calculations incorporating SOC. ARPES measurements reveal bands that are steeply dispersed in energy with a band velocity of 2.5-5.4 x 105 m/s, almost 50% of the extremely conductive material graphene. Additionally, CuInTe2 single crystals are fabricated into electrodes to experimentally determine the valence band edge energy and confirm the thermodynamic suitability of CuInTe2 for water redox chemistry. The electronic structure characterization and band edge position presented in this work provide kinetic and thermodynamic factors that support CuInTe2 as a strong candidate for water reduction.

    关键词： photoelectrochemical H2 generation,electronic structure,spin orbit coupling,chalcopyrite semiconductors,band velocity,valence band edge energy,Transition metal chalcogenides,angle-resolved photoelectron spectroscopy,water redox chemistry,CuInTe2

    更新于2025-09-10 09:29:36

  • High Responsivity and Quantum Efficiency of Graphene/Silicon Photodiodes Achieved by Interdigitating Schottky and Gated Regions

    摘要： Graphene / silicon (G/Si) heterostructures have been studied extensively in the past years for applications such as photodiodes, photodetectors and solar cells, with a growing focus on efficiency and performance. Here, a specific contact pattern scheme with interdigitated Schottky and graphene/insulator/silicon (GIS) structures is explored to experimentally demonstrate highly sensitive G/Si photodiodes. With the proposed design, an external quantum efficiency (EQE) of > 80% is achieved for wavelengths ranging from 380 to 930 nm. A maximum EQE of 98% is observed at 850 nm, where the responsivity peaks to 635 mA/W, surpassing conventional Si p-n photodiodes. This efficiency is attributed to the highly effective collection of charge carriers photogenerated in Si under the GIS parts of the diodes. The experimental data is supported by numerical simulations of the diodes. Based on these results, a definition for the ‘true’ active area in G/Si photodiodes is proposed, which may serve towards standardization of G/Si based optoelectronic devices.

    关键词： interdigitated contact,generation area,photocurrent,graphene,Schottky diode,inversion layer

    更新于2025-09-10 09:29:36

  • Blue skies over China: The effect of pollution-control on solar power generation and revenues

    摘要： Air pollution is the single most important environmental health risk, causing about 7 million premature deaths annually worldwide. China is the world’s largest emitter of anthropogenic air pollutants, which causes major negative health consequences. The Chinese government has implemented several policies to reduce air pollution, with success in some but far from all sectors. In addition to the health benefits, reducing air pollution will have side-benefits, such as an increase in the electricity generated by the solar photovoltaic panels via an increase in surface solar irradiance through a reduction of haze and aerosol-impacted clouds. We use the global aerosol-climate model ECHAM6-HAM2 with the bottom-up emissions inventory from the Community Emission Data System and quantify the geographically specific increases in generation and economic revenue to the Chinese solar photovoltaic fleet as a result of reducing or eliminating air pollution from the energy, industrial, transport, and residential and commercial sectors. We find that by 2040, the gains will be substantial: the projected solar photovoltaic fleet would produce between 85–158 TWh/year of additional power in clean compared to polluted air, generating US$6.9–10.1 billion of additional annual revenues in the solar photovoltaic sector alone. Furthermore, we quantify the cost of adopting best-practice emission standards in all sectors and find that the revenue gains from the increased solar photovoltaic generation could offset up to about 13–17% of the costs of strong air pollution control measures designed to reach near-zero emissions in all sectors. Hence, reducing air pollution in China will not only have clear health benefits, but the side-effect of increased solar power generation would also offset a sizeable share of the costs of air pollution control measures.

    关键词： China,pollution-control,air pollution,solar power generation,economic revenue

    更新于2025-09-10 09:29:36

  • Light for brevity

    摘要： The shortest time interval controlled by a human being is the duration of a light pulse as short as only 100 attoseconds, i.e., 10-16 s. This “attosecond” light pulse belongs to the extreme ultraviolet range (XUV) of the electromagnetic spectrum, with central photon energy typically between 20 and 200 eV. Related to its brevity, an attosecond pulse has a broad bandwidth covering tens of eV. These are natural time and energy scales to study electron dynamics in atoms and molecules.

    关键词： ultrafast atomic and molecular physics,high-order harmonic generation,attosecond pulses,electron dynamics

    更新于2025-09-10 09:29:36

  • Tutorial: Broadband fiber-wireless integration for 5G+ communication

    摘要： The increased bandwidth demand has motivated the exploration of fiber-wireless integration (FWI) for future broadband 5G+ cellular communication networks. FWI offers ultra-wideband (UWB) wireless delivery with low interference, which will be prospective for 5G/5G+ mobile communication wireless access, military application, disaster emergency communication, broadband communication at home, and so on. As an effective carrier, millimeter-wave (mm-wave) frequencies between 30 GHz and 300 GHz are a new frontier for FWI that offers the promise of orders of magnitude greater bandwidths. In this paper, we summarize all kinds of enabling technologies for FWI, including the photonic vector mm-wave generation scheme, the integration of various multi-dimensional multiplexing techniques, radio-frequency-transparent (RF-transparent) photonic demodulation technology for fiber-wireless-fiber network, and low-complexity high-efficiency digital signal processing (DSP). Based on DSP for UWB high-spectrum-efficiency signal coherent detection, we have made great progress in the field of the mm-wave-band (from Q- to D-band) broadband signal generation and long-distance transmission. These experimental results show that FWI with large-capacity, long-distance, and high-spectrum-efficiency has important scientific and practical significance for the development of the future 5G+ wireless communication.

    关键词： RF-transparent photonic demodulation,multi-dimensional multiplexing,fiber-wireless integration,5G+ communication,digital signal processing,photonic vector mm-wave generation,millimeter-wave

    更新于2025-09-10 09:29:36

  • Shape-modulated multiple exciton generation and optoelectronic properties in PbSe nanostructures

    摘要： Multiple exciton generation (MEG) in semiconductor nanostructures is of great interest for the enhancement of related performances in optoelectronic devices and for the shape dependence of conversion ef?ciency with which absorbed photons are converted into electron-hole pairs. However, theoretical insight into the coupling effects from the size and shape gradient on the MEG and related optoelectronic properties at the atomic level remains unclear. Here, we investigate the MEG and optoelectronic properties in PbSe nanostructures with different morphologies (nanocrystals, nanowires, and nanocones) based on the bond relaxation correlation mechanism, detailed balance principle, and Fermi statistical theory. It is found that size reduction of nanostructures can increase the bandgap, suppress the threshold energy, and enhance the MEG ef?ciency. Moreover, optimal conversion ef?ciency of PbSe nanostructures can be achieved by modulating the geometrical parameters.

    关键词： bond relaxation correlation mechanism,PbSe nanostructures,Fermi statistical theory,Multiple exciton generation,optoelectronic properties

    更新于2025-09-10 09:29:36