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“光电效应 光子”教学设计 被引量:3
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作者 杨继林 沈晨 《中学物理教学参考》 2003年第12期7-10,共4页
关键词 “光电效应光子” 教学设计 教学目标 高中 物理教学
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Molecular Frame Photoemission: Probe of the Photoionization Dynamics for Molecules in the Gas Phase 被引量:1
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作者 D. Dowek Y. J. Picard +2 位作者 P. Billaud C. Elkharrat J. C. Houver 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2009年第2期178-186,共9页
Molecular frame photoemission is a very sensitive probe of the photoionization (PI) dynamics of molecules. This paper reports a comparative study of non-resonant and resonant photoionization of D2 induced by VUV cir... Molecular frame photoemission is a very sensitive probe of the photoionization (PI) dynamics of molecules. This paper reports a comparative study of non-resonant and resonant photoionization of D2 induced by VUV circularly polarized synchrotron radiation at SOLEIL at the level of the molecular frame photoelectron angular distributions (MFPADs). We use the vector correlation method which combines imaging and time-of-flight resolved electron-ion coincidence techniques, and a generalized formalism for the expression of the Ⅰ(χ, θe, Фe) MFPADs, where χ is the orientation of the molecular axis with respect to the light quantization axis and (θe, Фe) the electron emission direction in the molecular frame. Selected MFPADs for a molecule aligned parallel or perpendicular to linearly polarized light, or perpendicular to the propagation axis of circularly polarized light, are presented for dissociative photoionization (DPI) of D2 at two photon excitation energies, hv=19 eV, where direct PI is the only channel opened, and hv=32.5 eV, i.e. in the region involving resonant excitation of Q1 and Q2 doubly excited state series. We discuss in particular the properties of the circular dichroism characterizing photoemission in the molecular frame for direct and resonant PI. In the latter case, a remarkable behavior is observed which may be attributed to the interference occurring between undistinguishable autoionization decay channels. 展开更多
关键词 Dissociative photoionization Molecular frame photoemission Circular dichroism in photoemission Autoionization dynamics Synchrotron radiation Vector correlation
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Growth Mode Investigation of 3,4,9,10-perylenetetra-carboxylic Dianhydride on p-Si Substrates by X-ray Photoemission Spectroscopy
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作者 SONG Zhen OU Gu-ping 《Semiconductor Photonics and Technology》 CAS 2007年第3期218-221,237,共5页
The growth mode of 3,4,9,10-perylenetetra-carboxylic dianhydride(PTCDA) deposited on p-Si substrates can be deduced by X-ray Photoemission Spectroscopy(XPS). The spectrum and fine spectrum at the surface of specimen a... The growth mode of 3,4,9,10-perylenetetra-carboxylic dianhydride(PTCDA) deposited on p-Si substrates can be deduced by X-ray Photoemission Spectroscopy(XPS). The spectrum and fine spectrum at the surface of specimen are studied. Firstly, PTCDA molecules assemble at the defects to form lots of three-dimensional island-like PTCDA crystal nucleuses, and then by the action of delocalized big π bond, two adjacent layers of PTCDA molecules overlap to some extent and finally island-like structure forms. PTCDA molecules of benzene ring combine with Si atoms at the defects, and that of acid anhydride radicals combine with Si atoms at the perfect fraction of the surface. In the course of combination, although the structure of benzene ring doesn't change, the chemical reaction of acid anhydride radicals and Si occurs to break off C=O bond in acid anhydride, and then C-Si-O and silicon oxide might be produced. 展开更多
关键词 PTCDA growth mode XPS
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Green perovskite light-emitting diodes with simultaneous high luminance and quantum efficiency through charge injection engineering 被引量:1
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作者 Tiankai Zhang Mingzhu Long +6 位作者 Lingxiang Pan Kwanho Ngai Minchao Qin Fangyan Xie Xinhui Lu Jian Chen Jianbin Xu 《Science Bulletin》 SCIE EI CAS CSCD 2020年第21期1832-1839,M0004,共9页
Metal halide perovskite light emitting diodes(PeLEDs)have recently experienced rapid development due to the tunable emission wavelengths,narrow emission linewidth and low material cost.To achieve stateof-the-art perfo... Metal halide perovskite light emitting diodes(PeLEDs)have recently experienced rapid development due to the tunable emission wavelengths,narrow emission linewidth and low material cost.To achieve stateof-the-art performance,the high photoluminescence quantum yield(PLQY)of the active emission layer,the balanced charge injection,and the optimized optical extraction should be considered simultaneously.Multiple chemical passivation strategies have been provided as controllable and efficient methods to improve the PLQY of the perovskite layer.However,high luminance under large injection current and high external quantum efficiency(EQE)can hardly be achieved due to Auger recombination at high carrier density.Here,we decreased the electron injection barrier by tuning the Fermi-level of the perovskite,leading to a reduced turn on voltage.Through molecular doping of the hole injection material,a more balanced hole injection was achieved.At last,a device with modified charge injection realizes high luminance and quantum efficiency simultaneously.The best device exhibits luminance of 55,000 cd m^-2 EQE of 8.02%at the working voltage of 2.65 V,current density of 115 mA cm^-2,and shows EQE T50 stability around 160 min at 100 mA cm^-2 injection current density. 展开更多
关键词 Perovskite LED High luminance Structure design Balanced charge injection Molecular doping
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