共查询到19条相似文献,搜索用时 62 毫秒
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用酞菁酮金属有机染料首次演示了基于反饱和吸收和自聚焦两种效应的光限幅器。实验和理论分析表明,这种限幅器的输入阈值功率由反饱和吸收决定,而自聚焦使限幅器的最大限幅输出功率降低,限幅效果显著增强。 相似文献
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基于NH2D气体斯塔克效应的光学双稳态 总被引:1,自引:0,他引:1
报道一种由NH_2D气体斯塔克盒和光电反馈控制回路构成的无腔镜光学双稳装置.实验中观测了该装置的光学双稳性,实验结果与理论分析相一致. 相似文献
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A. S. Komolov E. F. Lazneva N. S. Chepilko N. B. Gerasimova 《Physics of the Solid State》2013,55(7):1373-1376
The photovoltaic effect has been detected and studied in thin-film structures based on thermally deposited 200-nm-thick copper phthalocyanine (CuPc) films on the surface of polycrystalline CdS. The structures under study demonstrate the linear current-voltage characteristics at external electric fields to 3.5 × 104 V/cm. Two components of the photovoltage of different signs have been revealed when the sample is illuminated in the wavelength range from 350 to 700 nm. The first component has the positive sign on the CuPc film side and is observed when using the radiation with a wavelength lesser than 500 nm, i.e., in conditions of predominant absorption of the radiation in the CdS layer. The second component has the negative sign on the CuPc film side and is observed when using the radiation with a wavelength in the range from 500 to 570 nm, corresponding to the spectral region of the absorption edge of the CuPc films. The dependences of the photovoltage on the radiation intensity studied in the range from 5 × 1012 to 1014 photons cm?2 s?1 are different in the cases of the two detected components. Mechanisms of generation of the photovoltage components associated with a change in the band bending during photogeneration of charge carriers in the region of space charge in CdS and a change in conditions of the charge transfer in the interfacial CuPc/CdS region during the radiation absorption in the CuPc film have been proposed. 相似文献
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The multilayer film of PMMA containing mononuclear octakis(mercaptopropylisobutyl-POSS) substituted phthalocyaninato-copper (CuPc) was obtained by spin-coating on quartz substrate. The nonlinear absorption and optical limiting (OL) performance of CuPc have been described using the open-aperture Z-scan technique. The measurements were performed using collimated 4 ns pulses generated from a frequency-doubled Nd:YAG laser at 532 nm wavelength. The results indicate that CuPc/PMMA composite exhibits a much larger nonlinear absorption coefficient, a lower saturable fluence and a lower absorption cross-section ratio for optical limiting when compared to the same CuPc molecules in solution. No evidence of film fatigue or degradation was observed in the CuPc/PMMA film after numerous scans at varying laser intensity. This material is a good candidate for optical limiting applications. 相似文献
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酞菁铜固态薄膜的红外光谱 总被引:2,自引:0,他引:2
利用红外透射光谱,偏振透射光谱、掠角反射光谱研究了三-2,4-二特戊基苯氧基8-喹啉氧基酞菁铜LB膜和蒸镀膜的结构。确认在LB膜中,(1)取代基的碳链是以六方晶系或假六方晶系方式堆积的;(2)用偏振红外可以区别苯环上的两个CH2的伸缩振动带。在蒸镀膜中分子基本呈现无序状态。 相似文献
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For spherical Cu, Ag, and Au nanoparticles with a radius of 1–3 nm in copper phthalocyanine (CuPc), with allowance for internal
size effects, we calculate the scattering efficiency factor in the near zone, the extinction efficiency factor due to scattering
and absorption of incident radiation, and the efficiency of the increase in absorption by the matrix material. This occurs
in the CuPc absorption bands, as well as in the weak absorption region of CuPc, where, owing to surface plasmon resonance,
an additional absorption band arises for nanoparticles of all three materials. For Ag nanoparticles, the increase in absorption
is twice as high as for Cu and Au nanoparticles; for these it differs inconsiderably. 相似文献
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V.Yu. Aristov O.V. Molodtsova D.V. Vyalikh Yu.A. Ossipyan I. Mertig 《Applied Surface Science》2007,254(1):20-25
The filled and unoccupied electronic states of the organic semiconductor copper-phthalocyanine (CuPc) have been determined by a combination of direct and resonant photoemission, near-edge X-ray absorption and first principles calculations. The experimentally obtained electronic states of CuPc are in very good agreement with results of ab initio density of states, allowing to derive detailed site specific information. 相似文献
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Jun Li Fan Zhou Hua-Ping Lin Wen-Qing Zhu Jian-Hua Zhang Xue-Yin Jiang Zhi-Lin Zhang 《Superlattices and Microstructures》2012,51(4):538-543
A copper phthalocyanine (CuPc) organic semiconductor is capped onto an amorphous indium–gallium–zinc-oxide (InGaZnO) thin film transistor (TFT) to enhance the photosensitivity of InGaZnO-TFT. The CuPc organic semiconductor is served as a light absorption layer and forms a p–n junction with the InGaZnO film. After 60 s white light illumination, light responsivity (R) of InGaZnO-TFT with a CuPc light absorption layer reaches a value of 148.5 A/W at a gate-source voltage (VGS) of 20 V, which is much larger than that (31.2 A/W) of the conventional InGaZnO-TFT. The results are attributed to the following mechanism. First, a CuPc layer is employed as the light absorption layer. Second, CuPc/InGaZnO p–n junction enables the injection of electron into InGaZnO film. Our results indicate that using CuPc as light absorption layer is an effective approach to improve the photosensitivity of InGaZnO-TFT. 相似文献
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Photoconductivity measurements and ellipsometric spectroscopy have been used to study Cu-phthalocyanine (CuPc) overlayers on nonpolar ZnO (1 \(\bar 1\) 00) surfaces which have been prepared in ultrahigh vacuum (UHV). In the spectral range between 1.5 and 2 eV, i.e. in theπ→π * absorption band of CuPc a sensitized photoconductivity in the ZnO substrate is found. The analysis of the ellipsometric data suggests a chemisorption bond of the first monolayer of sublimated CuPc molecules accompanied by charge transfer between the ZnO substrate and the adsorbate. Bonding is most probably done through theπ-orbitals of the CuPc molecules. 相似文献
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酞菁铜薄膜的光记录特性 总被引:11,自引:3,他引:8
研究了有机染料酞菁铜(CuPc)真空蒸镀薄膜在可见及近红外区域的吸收光谱和光学常数,发现酞菁铜薄膜在550-750nm波长范围内具有较强的吸收,在静态测试仪上测试了酞菁铜薄膜的光存储记录特性,发现用低功率氦氖激光照样品时薄膜反射率变化较大,在酞菁记录层上覆盖金属反射层将提高写入激光的阈值能量并且增大反射率的对比度。 相似文献
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用紫外光电子能谱(UPS)研究了酞菁铜分子在Ag(110)单晶表面上的吸附,随着酞菁铜分子覆盖度增加,衬底Ag的3d电子信号逐渐减弱,在此能带区域出现两个新的谱峰,这两个与吸附有机分子轨道有关的谱峰的束缚能分别为4.45 和6.36 eV.随着覆盖度的增加,在结合能为1.51和9.20 eV处又出现了两个谱峰,它们同样来自吸附有机分子的轨道.随着覆盖度的继续增加,上述四个谱峰的强度逐渐增加,其能量位置均发生了明显的偏移.根据角分辨光电子能谱的实验结果,酞菁铜分子的分子平面基本与衬底表面平行.密度泛函理论计
关键词:
酞菁铜
紫外光电子谱
吸附电子态
密度泛函理论 相似文献