共查询到20条相似文献,搜索用时 234 毫秒
1.
有机及高分子薄膜电致发光 总被引:1,自引:0,他引:1
有机薄膜电致发光,因其具有低压直流驱动、高亮度、高效率、多色、能制成大面积等优点,有可能制产板显示,成为当前研究的特点,本文介绍了有机及高分子电致发光发展的历史、器件结构、发光原理和它的未来。 相似文献
2.
Graded-index ZrO2 films has been fabricated on K9 glass by glancing angle deposition. Because the index mismatch at the interface has been reduced, the film results in wideband high-transmission antireflection. From 400nm to 1200nm, the film reflection is lower than 0.8% and the lowest value is 0.2% at 432nm. 相似文献
3.
金属薄膜电阻特性与厚度测量 总被引:1,自引:0,他引:1
考察不同沉积时间的金属铝与铜的薄膜的沉积态,电阻变化与厚度,厚度测量采用实验室光学干涉和透过率对比方法.金相显微与铝铜电阻变化的测量表明,不连续薄膜与连续过渡之间,电阻显著变化处不同.铝膜电阻随时间变化过程开始时存在波动状态. 相似文献
4.
5.
6.
7.
8.
9.
10.
11.
Summary The optical properties of conductive transparent thin films of undoped SnO2, prepared by using magnetron supttering, were studied by measuring the transmittance and the reflectance between λ=0.25 μm
and λ=3μm. The extracted optical constants are interpreted to give values of a direct band gap of the order of 4 eV and of
an indirect band gap of the order of 3 eV. Typical SnO2 films transmit ≈85% of visible light, have sheet resistanceR
∂ (100÷800) Ω∂ and resistivities of (2.4·10−3÷1.8·10−2) Ω cm.
Riassunto Mediante la misura dei valori di transmittanza e di riflettanza per lunghezze d'onda comprese fra 0.25 μm e 3 μm, sono state studiate le proprietà ottiche di film sottili (trasparenti e conduttivi) di SnO2 non drogato, preparati mediante sputtering. Dai valori così ottenuti sono stati ricavati valori del gap diretto dell'ordine di 4 eV e di quello indiretto dell'ordine di 3 eV. Un film di SnO2 presenta tipicamente valori della transmittanza intorno all'85%, per luce visibile,R ∂ intorno ai (100÷800) Ω∂ e resistività fra 2.4·10−3 e 1.8·10−2 Ω cm.
Резюме Пзмеряя величины пропускания и отражения в области длин волн между λ=0.25 мкм и λ=3 мкм, исследуются оптические свойства проводящих прозрачных тонких пленок нелегированного SnO2, приготовленных с помощью напыления. Из полученных оптических постоянных извлекаются значения прямой щели, порядка 4 эВ, и непрямой щели, порядка 3 эВ. Типичные пленки SnO2 пропускают ∼85% видимого света, имеют сопротивлениеR ∂ (100÷800) Ω∂ и удельные сопротивления в области (2.4·10−3÷1.8·10−2) Ом·см.相似文献
12.
Summary We have studied the behaviour of photoacoustic response of implanted silicon samples in order to measure the thermal conductivity
of damaged layers; the results allow us to determine such a parameter simply by the phase difference measurement between implanted
and unimplanted regions of the sample.
Riassunto è stata studiata la risposta fotoacustica di campioni di silicio impiantato allo scopo di misurare la conducibilità termica degli strati danneggiati; i risultati permettono di determinare questa grandezza misurando semplicemente la differenza di fase tra la zona impiantata e quella cristallina del campione.
Резюме Исследуется поведение фотоакустического отклика на образцах имплантированного кремиия, чтобы измерить теплопроводность поврежденных слоев. Полученные результаты позволяют получить величину теплопроводности с помощью измерения разности фаз между имплантированной и неимплантированной областлми образца.相似文献
13.
G. A. Adegboyega 《Il Nuovo Cimento D》1989,11(7):969-979
Summary The room temperature oxidation of vapour deposited copper films has been investigated as a function of film thickness and
time by the sheet resistance and optical transmittance measurements. An increase of both sheet resistance and transmittance
with a tendency to saturation has been observed. Time variation of the sheet resistance shows that the kinetics of oxidation
could be described by a model whereby an initial logarithmic oxide growth changes to an inverse logarithmic one as time progresses;
the thicker the film, the longer the change-over time. Absorption coefficients of oxidized films show that the resulting oxide
is most probably Cu2O. Evaluation of the oxidized films for possible use as transparent electrode material shows the existence of an optimum thickness
value.
Riassunto Si è studiata l’ossidazione a temperatura ambiente di pellicole di rame depositate per vaporizzazione in funzione dello spessore della pellicola e del tempo mediante la resistenza del foglio e misurazioni di trasmittenza ottica. Si è osservato un aumento sia della resistenza del foglio, sia della trasmittenza con una tendenza alla saturazione. La variazione temporale della resistenza del foglio mostra che la cinetica di ossidazione potrebbe essere descritta da un modello con cui un’iniziale crescita logaritmica dell’ossido cambia in una logaritmica inversa al crescere del tempo; più spessa è la pellicola più lungo è il tempo del cambiamento. I coefficienti di assorbimento delle pellicole ossidate mostrano che l’ossido risultante è molto probabilmente il Cu2O. La valutazione delle pellicole ossidate per un possibile uso come materiale di elettrodo trasparente mostra l’esistenza di un valore ottimo dello spessore.
Резюме Исследуется окисление при комнатной температуре пленок меди в зависимости от толщины пленки и времени, используя измерения сопротивления слоя и оптической прозрачности. Наблюдается увеличение сопротивления слоя и прозрачности с тенденцией к насыщению. Временное изменение сопротивления слоя показывает, что кинетика окисления может быть описана с помощью модели, согласно которой начальный логарифмический рост окисла изменяется на обратно логарифмический, когда время увеличивается; для более толстой пленки изменение происходит при больщих временах. Коэффициенты поглощения окисленных пленок показывают, что результирующий окисел представляет Cu2O. Оценка возможности использования окисленных пленок в качестве прозрачного материала электродов указывает на существование оптимальной толщины пленки.相似文献
14.
Summary We have observed IR detection signals with ns response in irradiated Bi thin films, which were evaporated at large angles
with the substrate normal direction. At 10 μm radiation, these detectors show a voltage response with reversed sign compared
to the visible-light response which is generated by a well-known thermoelectric effect. Other thin-film metallic detectors
as Cr films operating with this effect do not show this sign inversion at 10 μm. We attribute the sign-reversed fast signal
in bismuth to a transversal photon drag effect related to the interband transition induced by the 10 μm radiation.
Riassunto Noi abbiamo osservato una generazione di tensione prodotta ai capi di un film anisotropo di bismuto dall'assorbimento di radiazione a 10 μm. Questa risposta è veloce (ns) ed è differente dal normale segnale termovoltaico osservato in Bi e altri metalli (es. Cr) illuminati da luce visibile, sebbene tale segnale sia osservabile anche a 10 μm. Noi abbiamo attribuito questo segnale veloce ad un effetto di photo-drag trasverso dovuto a transizioni interbanda in microcristalli orientati da una evaporazione a forte angolo.
Резюме Мы наблюдаем сигналы детектирования инфракрасного излучения с наносекундным временем отклика в облученных тонких пленках Bi которые напылены при больщих углах к нормальному направлению подложки. При облучении с длиной волны 10 мкм зти детекторы обнаруживают отклик с обратным знаком по сравнению с откликом для видимого света, котрый генерируется за счет хорошо известного термозлектрического зффекта. Другие тонкопленочные металлические детекторы, например пленки Cr, работающие на том же зффекте, не обнаруживают явления обращения знака при длине волны 10 мкм. Мы приписываем явление обращения знака в висмуте зффекту сопротивления фотонов, связанному с внутризонным переходом, индуцированным излучением с длиной волиы 10 мкм.相似文献
15.
Thin films of indium-tin oxide have been deposited by DC diode sputtering from an indium-tin alloy target in an argon, hydrogen
and oxygen atmosphere. Films with sheet resistance of 11 ohms/square and 80% light transmission have been obtained. The effect
of cathode composition and gas mixture on sheet resistance and optical transmission properties of the films have been studied. 相似文献
16.
Summary The electrical-conductivity frequency dependence of reactive-evaporation-depositeda-Si:H films has been measured in the temperature range (100÷450)K. The influence of the substrate temperature, of the hydrogen
ions energy and of post-deposition thermal treatments has also been investigated. The results show that, depending on the
material quality, three different conduction mechanisms associated with gap states, band or band tail states and to hopping
processes near the Fermi level are observed. 相似文献
17.
Summary Two kinds of switching phenomena in CdIn2S4 polycrystalline and amorphous thin films which were prepared by the vacuum evaporation method and the d.c. sputtering method,
respectively, were studied. One is the so-called memory switching phenomenon arising from the low resistive filament path.
Another is a characteristic switching phenomenon in which the resistivity abruptly changes whenever the ambient temperature
reaches a critical value. The switching time is fast and about 100 ns. This switching phenomenon is related to the native
defects in the CdIn2S4 lattice, because they can be observed in the polycrystalline as well as in the amorphous thin films.
Paper presented at the ?V International Conference on Ternary and Multinary Compounds?, held in Cagliari, September 14–16,
1982. 相似文献
18.
H.M. Ali M.M. Abd El-Raheem N.M. Megahed H.A. Mohamed 《Journal of Physics and Chemistry of Solids》2006,67(8):1823-1829
Aluminum-doped zinc oxide (AZO) thin films have been deposited by electron beam evaporation technique on glass substrates. The structural, electrical and optical properties of AZO films have been investigated as a function of annealing temperature. It was observed that the optical properties such as transmittance, reflectance, optical band gap and refractive index of AZO films were strongly affected by annealing temperature. The transmittance values of 84% in the visible region and 97% in the NIR region were obtained for AZO film annealed at 475 °C. The room temperature electrical resistivity of 4.6×10−3 Ω cm has been obtained at the same temperature of annealing. It was found that the calculated refractive index has been affected by the packing density of the thin films, whereas, the high annealing temperature gave rise to improve the homogeneity of the films. The single-oscillator model was used to analyze the optical parameters such as the oscillator and dispersion energies. 相似文献
19.
Summary An ion-beam-assisted deposition (IBAD) technique, based on reactive evaporation using hydrogen/ methane gas mixture, has been
used for the preparation ofa-Si1−x
C
x
: H films. Measurements are reported on the composition, optical gap, infra-red vibrational absorption bands and on the electrical
dark-conductivity temperature dependence to verify the reliability of this deposition method. On increasing the compositional
parameterx up to 0.35, the IR results show an increasing hydrogenation and the presence of Si-CH3 units in addition to the ones with the carbon fully coordinated with the silicon, while the optical-gap and the dark-conductivity
activation energies reached the values of 2.44 eV and 0.77 eV, respectively.
The authors of this paper have agreed to not receive the proofs for correction 相似文献