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2.
An advanced CMOS process, which used rapid vapor-phase doping (RVD) for pMOSFETs and solid-phase diffusion (SPD) for nMOSFETs, has been developed. Using the RVD technique, a 40-nm-deep p-type extension with a sheet resistance as low as 400 /spl Omega//sq has been realized. These RVD and SPD devices demonstrate excellent short-channel characteristics down to 0.1 /spl mu/m channel length and 40% higher drain current, compared with conventional devices with ion implanted source/drain (S/D) extensions, and high-speed circuit performance. We investigate the effect of the S/D extension structure on the device performance and find that a gate extension overlap of 25 nm enables excellent dc and high-speed circuit performance in 0.1-/spl mu/m devices. 相似文献
3.
This paper reviews our recent progress on silicon (Si) pn junction light emitting diodes with locally doping engineered carrier potentials.Boron implanted Si diodes with dislocation loops have electrol... 相似文献
4.
N. V. Zotova S. S. Kizhaev S. S. Molchanov T. I. Voronina T. S. Lagunova B. V. Pushnyi Yu. P. Yakovlev 《Semiconductors》2003,37(8):955-959
Light-emitting diodes for the wavelength range λ=3.3–4.5 µm were fabricated on the basis of InAsSbP/InAsSb heterostructures grown by metal-organic vapor-phase epitaxy. The use of vapor-phase epitaxy made it possible to appreciably increase the phosphorus content in barrier layers (up to 50%) in comparison with that attainable in the case of liquid-phase epitaxy; correspondingly, it was possible to improve confinement of charge carriers in the active region of the structures. Photoluminescent properties of InAsSb layers, electroluminescent properties of light-emitting diodes, and dependences of the emission power on current were studied. Two types of light-emitting diodes were fabricated: (i) with extraction of emission through the substrate (type A) and (ii) with extraction of emission through the epitaxial layer (type B). The light-emitting diodes operating in the pulse mode (with a relative pulse duration of 20) had an emission power of 1.2 mW at room temperature. 相似文献
5.
GaN n- and p-type Schottky diodes: Effect of dry etch damage 总被引:3,自引:0,他引:3
Cao X.A. Pearton S.J. Dang G.T. Zhang A.P. Ren F. Van Hove J.M. 《Electron Devices, IEEE Transactions on》2000,47(7):1320-1324
The reverse breakdown voltage (VB) and forward turn-on voltage (VF) of n- and p-GaN Schottky diodes were used to examine the effects of Cl2/Ar and Ar plasma damage. Even short plasma exposures (4 secs) produced large changes in both VB and VF, with ion mass being a critical factor in determining the magnitude of the changes. The damage depth was established to be 500-600 Å and the damaged material could be removed in boiling NaOH solutions, producing a full recovery of the diode properties. Annealing at 700 to 800°C under N2 produced only a partial recovery of VB and VF 相似文献
6.
Silicon carbide PIN diodes have been fabricated using a direct-write laser-doping technique that reduces defect generation
compared to the conventional ion-implantation technique. Nitrogen and aluminum were successfully incorporated into SiC as
n-type and p-type dopants, respectively. Rutherford backscattering studies were conducted to compare the lattice defect generation
by the laser-doping and ion-implantation techniques. No amorphization was observed in laser-doped samples, eliminating the
need for high-temperature annealing. The current-voltage (I-V) and capacitance-voltage (C-V) characteristics of the PIN diodes
were also investigated. The silicon carbide diodes are intended for high-temperature and high-voltage power electronics applications. 相似文献
7.
Schottky-barrier junction mixer diodes compatible with monolithic integration have been fabricated on semi-insulating GaAs substrates using buried VPE n+ layers and deep mesa etch processing. A 590 GHz cutoff frequency was determined using modified DeLoach analysis and fin-line chip mounting. A 5.3 dB (SSB) noise figure and a 4.8 dB conversion loss were obtained at 35 GHz for a pair of chips in a balanced microstrip mixer. 相似文献
8.
Uchino T. Shiba T. Kikuchi T. Tamaki Y. Watanabe A. Kiyota Y. 《Electron Devices, IEEE Transactions on》1995,42(3):406-412
We present a detailed study of the performance of very-high-speed silicon bipolar transistors with ultra-shallow junctions formed by thermal diffusion. Devices are fabricated with double-polysilicon self-aligned bipolar technology with U-groove isolation on directly bonded SOI wafers to reduce the parasitic capacitances. Very thin and low resistivity bases are obtained by rapid vapor-phase doping (RVD), which is a vapor diffusion technique using a source gas of B2H6. Very shallow emitters are formed by in-situ phosphorus doped polysilicon (IDP) emitter technology with rapid thermal annealing (RTA). In IDP emitter technology, the emitters are formed by diffusion from the in-situ phosphorus doped amorphous silicon layer. Fabricated transistors are found to have ideal I-V characteristics, large current gain and low emitter resistance for a small emitter. Furthermore, a minimum ECL gate delay time of 15 ps is achieved using these key techniques. Analyses of the high performance using circuit and device simulations indicate that the most effective delay components of an ECL gate are cut-off frequency and base resistance. A high cut-off frequency is achieved by reducing the base width and active collector region. In this study, RVD is used to achieve both high cut-off frequency and low base resistance at the same time 相似文献
9.
Tunable microcavities in organic light-emitting diodes by way of low-refractive-index polymer doping
A method for enhancing the light out-coupling efficiency of organic light-emitting devices (OLEDs) has been demonstrated by blending a low-refractive-index polymer, poly(2,2,3,3,3-pentafluoropropyl methacrylate) (PPFPMA), into the emission layer. The resonant wavelength of the weak microcavity devices blueshifted accompanied with a decrease in refractive indices of the light-emitting layers after the addition of PPFPMA. Stronger directed emission toward the surface normal was obtained when the resonant wavelength became closer to the peak wavelength of intrinsic emission spectrum of the organic emitters. The luminous efficiency of the devices was enhanced by more than 20%. The results suggest that the microcavity properties of the OLEDs can be tunable through blending low-refractive-index materials. 相似文献
10.
M. L. Warddrip M. J. Kappers L. Li H. Qi B. K. Han S. Gan R. F. Hicks 《Journal of Electronic Materials》1997,26(10):1189-1193
The rates of decomposition of carbon tetrachloride (CCl4), triethylgallium (TEGa), and tertiarybutylarsine (TBAs), and the rate of GaAs film growth, were measured as a function of
the process conditions during organometallic vapor phase epitaxy. In addition, the reaction of CCl4 with the GaAs(001) surface was monitored in ultrahigh vacuum using infrared spectroscopy, temperature-programmed desorption,
and scanning tunneling microscopy. These experiments have revealed that CCl4 adsorbs onto Ga sites, and decomposes by transferring chlorine ligands to other Ga atoms on the surface. Chlorine and gallium
desorb from the surface as GaCl, while the carbon incorporates into the lattice. Triethylgallium is consumed by two competing
reactions: GaAs film growth and GaCl etching. Depending on the V/III and IV/III ratios and temperature, the etch rate can
be high enough to prevent any GaAs deposition. 相似文献
11.
The influence of doping profile on the efficiency of GaAs Read-type IMPATT diodes has been studied experimentally. A diode with low breakdown voltage, or a diode with a low bias field in the drift region, gave the highest efficiency. The mechanism will be discussed, estimating the restriction of RF voltage amplitude and the change of phase relation between RF current and voltage. 相似文献
12.
红绿掺杂有机电致发光器件发光性能的研究 总被引:2,自引:2,他引:0
制备了结构为ITO/MoO3(x nm)/NPB(40nm)/CBP:14%GIr1(12.5nm)/CBP:6%R-4b(5nm)/C BP:14% GIr1(12.5nm)/BCP(10nm)/Alq3( 40nm)/LiF(1nm)/Al(100nm)的红绿磷光器件,G Ir1和R-4B分别为新型绿色和 红色磷光染料,采用绿-红-绿掺杂顺序,结合BCP对空穴的有效限制作用,研究了不同MoO 3厚度器件的发光 机理。结果表明,在MoO3为40nm时,器件发光性能较好,在电压 为5V、亮度为100cd·m-2时,得到最大的 电流效率为16.91cd·A-1。为提高器件光效,增加TCTA电子 阻挡层,获得了最高电流效率20.01cd·A-1。原因主要是, TCTA的HOMO能级介于NPB和CBP之间,促进空穴注入;TCTA较高的三线态能量对发光层激子的 限制。 相似文献
13.
A. S. Kyuregyan 《Semiconductors》2002,36(2):235-238
An exact analytical solution to the problem of minimizing the drift-region resistance in high-power unipolar devices was obtained. It is shown that the optimal dopant profile N(x) features a minimum in the central part of the drift region and increases without restriction when either of the boundaries of this region are approached. 相似文献
14.
A. V. Solomonov S. A. Tarasov E. A. Men’kovich I. A. Lamkin S. Yu. Kurin A. A. Antipov I. S. Barash A. D. Roenkov H. Helava Yu. N. Makarov 《Semiconductors》2014,48(2):245-250
The results of work on developing and studying ultraviolet (UV) light-emitting diodes (LEDs) based on GaN/AlGaN heterostructures fabricated on Al2O3(0001) substrates by the chloride-hydride vaporphase epitaxy are presented. The maximum in the electroluminescence spectrum is located in the wavelength range of 360–365 nm, and its full width at half maximum is 10–13 nm. At a working current of 20 mA, the optical density and efficiency of the UV LED are 1.14 mW and 1.46%, respectively. 相似文献
15.
《Electron Devices, IEEE Transactions on》1970,17(4):275-281
A one-dimensional computer simulation of Gunn diodes with zero-impedance external load has been made for various nonuniform doping profiles including asymmetrical step-like ones, linearly graded ones, and a periodic square-wave one. The distances between the electrodes and the doping level are taken as 10 µ and an order of 1015cm-3, respectively. Current-voltage characteristics, oscillation current waveforms, oscillation frequency versus applied voltage characteristics, and electric field distributions as well as their dynamic changes were computed for the profiles with various parameters. The results show that with asymmetrical doping profiles, Gunn oscillation takes place when the cathode is on the higher resistance side, while for the opposite polarity it is difficult for the oscillation to occur. In the latter case, a static high-field domain is built up in the vicinity of the anode. The results also show that the voltage dependence of oscillation frequency is enhanced by an asymmetrical nonuniformity in the doping profiles. A considerable rise of the threshold voltage of the oscillations is found for the periodic square-wave profile. An experimental result is analyzed on the basis of the computed results. 相似文献
16.
Barrier height engineering of n-GaAs-based millimeter-wave Schottky diodes using strained InGaAs/GaAs and InGaP/GaAs heterostructures and a high doping surface layer is presented. The Schottky barrier height can be varied between Φfb=0.52 eV and Φfb=1.0 eV. The use of a pseudomorphic InGaAs layer and/or a thin high doping layer at the surface significantly reduces the Schottky barrier height. This is advantageous for low-drive zero bias mixing applications, A full quantum mechanical numerical calculation is presented to simulate the influence of different high doping layer thicknesses on the diode's dc characteristic. The theoretical results are compared with experimental results, For reverse bias applications (e.g., varactors) a barrier height and breakdown voltage enhancement is realized with a lattice matched InGaP/GaAs heterostructure. The barrier height value is determined by temperature dependent dc-measurements. The epitaxial layered structures are grown by molecular beam epitaxy. The diode devices are fabricated in a fully planar technology using selective oxygen implantation for lateral isolation. The diode's cut-off frequencies are in the THz-range 相似文献
17.
N. V. Zotova S. S. Kizhaev S. S. Molchanov T. B. Popova Yu. P. Yakovlev 《Semiconductors》2000,34(12):1402-1405
InAs/InAs0.93Sb0.07/InAs heterostructures were grown by metal-organic vapor-phase epitaxy in a horizontal reactor at atmospheric pressure. Based
on the obtained structures, light-emitting diodes operating at λ=3.45 μm (T=77 K) and λ=3.95 μm (T=300 K) were fabricated. The room-temperature quantum efficiency of light-emitting diodes was 0.12%.
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Translated from Fizika i Tekhnika Poluprovodnikov, Vol. 34, No. 12, 2000, pp. 1462–1467.
Original Russian Text Copyright ? 2000 by Zotova, Kizhaev, Molchanov, Popova, Yakovlev. 相似文献
18.
M. J. Bevan H. D. Shih J. A. Dodge A. J. Syllaios D. F. Weirauch 《Journal of Electronic Materials》1998,27(6):769-771
Trisdimethylaminoarsine was used in atmospheric-pressure metalorganic chemical vapor deposition growth of ZnSe on GaAs. The
metalorganic precursors employed for ZnSe growth were diethylzinc and diethylselenide, and ethyliodide was used as then-type
dopant. P-on-n light emitting diode (LED) structures were prepared, and molecular beam epitaxially deposited HgTe layers were
used as ohmic contacts to the p-type ZnSe. Blue LEDs were fabricated on p-on-n samples. Preliminary LED data and the material
characterization data are presented. 相似文献
19.
InAs heterojunction bipolar transistors (HBTs) are promising candidates for low power and high frequency (THz) device applications
due to their small bandgap, high electron mobility, and high saturation drift velocity. However, doping limits such as the
trade-off between desired low intentional n-type concentrations and unintentional doping, and the realization of high p-type
concentrations, must still be considered in device design and synthesis. In order to observe the impact of intentional and
unintentional n-type doping on diode electrical properties, InAs-based homojunction diodes have been grown on InAs substrates
by solid-source molecular beam epitaxy (SSMBE) and were subsequently fabricated and characterized. 相似文献
20.
The steady and dynamic properties are comparatively simulated results show that the n-doped LED exhibits is mainly attributed to the higher carrier radiative experimental results perfectly. investigated for the n-doped and non-doped InGaN LEDs. The the superior luminescence and modulation performance, which rate of n-doped LED. The results can explain the reported 相似文献