• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    結(jié)合橢圓偏振光譜與傅里葉紅外光譜的寬禁帶半導(dǎo)體薄膜光學(xué)特性表征

    2016-11-28 03:50:22謝燈丘志仁萬玲玉TINChinche梅霆馮哲川
    光散射學(xué)報 2016年3期
    關(guān)鍵詞:光電子禁帶光譜

    謝燈,丘志仁,萬玲玉,TIN Chin-che,梅霆,馮哲川

    (1.華南師范大學(xué)光電子材料與技術(shù)研究所,廣州 510631;2.中山大學(xué)光電材料與技術(shù)國家重點(diǎn)實(shí)驗(yàn)室,物理學(xué)院,廣州 510275;3.廣西大學(xué)物理科學(xué)與工程技術(shù)學(xué)院,廣西相對論天體物理重點(diǎn)實(shí)驗(yàn)室,光電子材料與探測技術(shù)實(shí)驗(yàn)室,南寧 530004;4.馬來西亞大學(xué)機(jī)械工程系,馬來西亞 吉隆坡 50603;5.奧本大學(xué)物理學(xué)院,美國 奧本36849;6.西北工業(yè)大學(xué)理學(xué)院,教育部空間應(yīng)用物理與化學(xué)重點(diǎn)實(shí)驗(yàn)室,陜西省光信息技術(shù)重點(diǎn)實(shí)驗(yàn)室,西安710072)

    ?

    結(jié)合橢圓偏振光譜與傅里葉紅外光譜的寬禁帶半導(dǎo)體薄膜光學(xué)特性表征

    謝燈1,2,丘志仁2*,萬玲玉3,TIN Chin-che4,5,梅霆6,馮哲川3

    (1.華南師范大學(xué)光電子材料與技術(shù)研究所,廣州 510631;2.中山大學(xué)光電材料與技術(shù)國家重點(diǎn)實(shí)驗(yàn)室,物理學(xué)院,廣州 510275;3.廣西大學(xué)物理科學(xué)與工程技術(shù)學(xué)院,廣西相對論天體物理重點(diǎn)實(shí)驗(yàn)室,光電子材料與探測技術(shù)實(shí)驗(yàn)室,南寧 530004;4.馬來西亞大學(xué)機(jī)械工程系,馬來西亞 吉隆坡 50603;5.奧本大學(xué)物理學(xué)院,美國 奧本36849;6.西北工業(yè)大學(xué)理學(xué)院,教育部空間應(yīng)用物理與化學(xué)重點(diǎn)實(shí)驗(yàn)室,陜西省光信息技術(shù)重點(diǎn)實(shí)驗(yàn)室,西安710072)

    寬禁帶半導(dǎo)體薄膜,包括碳化硅,氮化鎵和氧化鋅及其化合物以及異構(gòu)體,帶隙普遍在3.2 eV以上,一階聲子特征峰在100至1500 cm-1之間。確定能帶寬度和聲子特征峰有很多方法,比如光致發(fā)光、拉曼散射、光學(xué)透射譜等,我們提出了一種結(jié)合橢圓偏振光譜與紅外傅里葉反射譜進(jìn)行傳輸矩陣分析的方法,能夠同時確定從紫外波段(約250 nm)到遠(yuǎn)紅外波段(約22000 nm)的薄膜材料色散關(guān)系和膜厚。我們構(gòu)建了基于諧振子的光學(xué)函數(shù)模型,并論證這個模型很適合用于模擬由各種不同波長入射光波造成的共振吸收。

    橢圓偏振光譜;傅里葉紅外光譜;傳輸矩陣方法

    1 Introduction

    In the past decades,wide bandgap semiconductors attracted much attention due to their significant advantages in ultra-violet optoelectronic applications.GaN,SiC and ZnO-based materials have their niche areas of applications,respectively.For example,GaN and related ternary- quaternary- components are easier to implement bandgap engineering,hence suitable as the active region of light emiting diode by growing multiple quantum wells on sapphire or silicon substrates.Silicon carbide,with three kinds of commonly used isomers,3C-SiC (cubic,F-43m configuration),4H-SiC and 6H-SiC (both hexagonal,P63mc configuration),are more suitable for high power optoelectronic devices.ZnO is the new favourite among the emerging materials,due to its excellent properties predicted by ab-initio calculations and other simulations.If the crystal quality and the p-type doping problem can be resolved,ZnO can be an excellent candidate for optoelectronic applications in crucial environment.

    Various commercial software,such as VASP and CASTEP,can be used to predict material properties in the ab-initio way.Phonon band diagram,which can be further used to investigate the phonon modes,could be calculated using GGA-PBE psudopotentials; dielectric function,including reflectance index and extinction coefficient,although more time consumable,can also be simulated by using GW or HSE pseudopotentials.These are the most physical picture for material interaction with electromagnetic wave,in which extinction coefficientkcan show absorption peak due to resonance with the incident light,and the dielectric functionnshowing abnormal dispersion wherever there is a resonance peak due to Kramers-Kronig relation.This dispersion relation is valid for incident light with wavelength ranging from hard X-ray region to beyond the microwave region.Each region possesses a representative technique:infrared region - Raman scattering,Fourier transform infrared spectroscopy (FTIR),around visible region - optical transmission,optical reflectance,photolumiescense,spectroscopic ellipsometry (SE),X-ray region - X-ray reflectance (XRR),X-ray diffraction (XRD),X-ray absorption fine structure (XAFS).Each technique has their benefits and limitations.Here we propose a combination of variable angle spectroscopic ellipsometry (VASE) technique with FTIR,using transfer matrix simulation and optimization method to link the theory of light scattering with thin film and the experiments.From some examples shown below,we could argue that through this kind of analysis,thin film thickness and dispersion relation can be obtained simultaneously,and the result can be reliable.

    2 Theory

    FTIR is a widely used technique in the chemical industry,biological identifications and materials science etc.In the field of condensed matter,it is a powerful method to investigate the so called Reststrahlen band,which is a reflectance phenomenon that electromagnetic radiation within a narrow energy band cannot propagate within a given medium due to a change in refractive index concurrent with the specific absorbance band of the medium in question.

    FTIR is connected with ion oscillation in crystal,while SE is connected with electron oscillations.In semiconductors,discrete energy levels due to quantum effect give rise to an energy band,while the forbidden band width between conductive band and valence band is called bandgap.Photon energy less than the bandgap cannot be absorbed by the crystal,so absorption index shows a step in the bandgap region.SE should be the best way to characterize the shape of this kind of absorption.Frequently,there is more than one absorption band,due to the energy split occurring in semiconductors.

    Due to the complexity and difficulty in quantitative analysis of FTIR & VASE spectrum,we used a unified model - general oscillator,to simulatenandk,and transfer matrix method is used to describe the interaction of incident light with material.

    Transfer matrix method[1-4]uses a series of production of 4×4 matrix,i.e.

    to represent a stack of layers,due to the fact that the field at the end of the layer can be derived from a simple matrix operation.

    General oscillator includes different kinds of oscillators,which originates from various analytical model.Commonly used models,such as Forouhi Bloomer,Tauc Lorentz,Drude,HOA (Harmonic Oscillator Approximation),Lorentz,Gaussian and Tanguy,and their analytic expression can be obtained as shown in various references[5-10].

    The most important parameters,En (peak position of the oscillator),Amp (amplitude) and Br (broadening) occur in each kind of oscillators.For some types there is an extra parameter to determine the asymmetric properties.All the oscillators obey the Kramers-Kronig relation.

    3 Experimental details

    The 3C-SiC is grown on (100) Si substrate at Auburn University under normal atmospheric pressure environment by using the CVD method in vertical reactor configuration.The V-CVD system employs a rotating SiC-coated susceptor heated by a radio-frequency induction power supply and is capable of operating at both atmospheric and low pressure modes.After in situ etching of the substrate by hydrogen chloride (HCl) at 1200℃,the 2 min growth of a buffer layer accommodates the lattice and CTE mismatch between 3C-SiC and Si.The V-CVD sample comprises only the initiation of the buffer layer in the presence of propane.The complete details of the process followed in the growth of 3C-SiC/Si (1 0 0) epilayers have been described elsewhere.

    The GaN epilayer is grown Si-doped by metalorganic chemical vapor deposition (MOCVD).For GaN/sapphire,it is grown on the c-plane of sapphire substrate.A GaN buffer layer (25 nm thick) was first grown on substrate at lower temperature of 450 ℃ before about 2m GaN film was deposited at a higher temperature of 1,050℃.For Si-doped samples,silane (SiH4) was used to dope GaN films n-type.For GaN epitaxial layers grown on Si (001) substrates,details of growth conditions can be found elsewhere[11].

    Room temperature infrared reflectance spectra were measured by using a nitrogen purged Perkin Elmer 2000 spectrometer with an ~2 cm-1resolution at near normal incidence (θi≈8°).The spectral measurements were carried out in the IR range of the instrument (200~6500 cm-1) with a KBr beam-splitter and a deuterated triglycine sulfate detector.Room temperature multi-angle spectroscopic ellipsometer M-2000 from J.A.Woollam company is used to determin SE spectra from 250 nm to 1700 nm in three angles,60°,65° and 70°

    4 Data analysis

    We use Cody-Lorentz and Tauc-Lorentz oscillator to simulate band edge profiles,while Lorentz alone is good enough to simulate phonon modes in IR region[5].

    The Lorentz model has the following form:

    (2)

    The Cody-Lorentz model has the following form:

    (3)

    The Tauc-Lorentz model has the following form:

    (4)

    The real part of the dielectric function ε1is obtained by exploiting the Kramers-Kronig integrations on equation (2) to (4),i.e.,

    (5)

    5 Results and discussion

    For 3C-SiC grown on silicon,dielectric function of Si substrate is well understood.We can use three general oscillators to simulate absorptions above band edge,and phonon modes are in the range of 600 cm-1to 6000 cm-1which is the range of interest in FTIR.We use dielectric function of cubic silicon carbide measured by Palik[12]etc.as an initial value.Then the film thickness is roughly adjusted to match the interference fringe in the range of 1000 nm to 10000 nm,which stretch over the two types of measurement(Fig.1).Four general oscillators are carefully added and adjusted (Fig.2),first two of them are related to bandgap profile,and the other two connected to the dip in the Reststrahlen band and an obviously more intense oscillation just beyond the Reststrahlen band.Automatic fitting procedure gives the final result shown in Fig.2.The two phonon modes are at 793 cm-1and 894 cm-1,with the given amplitude and broadening(Fig.3).

    Fig.1 (a) VASE spectra,(b) FTIR spectra and (c) dispersion relation of 3C-SiC on Si

    Fig.2 Model and oscillators used in 3C-SiC on Si (#3C713)

    Fig.3 Phonon modes derived from TRPL data fitting

    The phonon mode in 894 cm-1is not reported in most SiC papers; we also found it to be weaker than the TO mode at 793 cm-1by more than ten order of magnitude,and this mode can be weaker or disappeared when measured at oblique incident angle.We are still trying with some theoretical methods (like first principle) to find out the origin of this weak mode.

    Fig.4 FTIR spectra and dielectric function of GaN on Sapphire

    Fig.5 Model and oscillators used in GaN on Sapphire (#N900)

    For GaN on sapphire,we start from a simulation of bulk sapphire sample which is also measured by FTIR.Since dielectric function of commercial sapphire is well known,we use then&kin the database,ranging from 250 nm to 1000 nm as starting values.Then we use the Cauchy model to spread the value to infrared range,disregarding the phonon modes.

    Until now,the modeled FTIR data is nearly a straight line in the infrared range.We can add oscillators,called Tauc-Lorentz to simulate the phonon modes.After several times of fitting,we can get the final parameter fit to the experimental data well (Fig.4,Fig.5).

    Now we have precisen&kdata in the infrared range,where each phonon mode represents absorption of an oscillator.We can use it as a base model in GaN / sapphire structure,and just fix the parameter before making fine adjustment.As the dielectric function of GaN is also well investigated,we can use the results from various references as a starting point.Then,as shown in Fig.5,we use two oscillators (1 and 2) to model the GaN bandgap around 3.4 eV,and the other three modes to simulate LO phonon mode,TO phonon mode and free carrier absorption.

    After several fitting procedures,we can get the parameters with sufficiently small mean square error.Two phonon modes,559 cm-1and 736 cm-1represent the LO and TO modes respectively.In fact,these two modes can be identified from the original spectrum,which shows two dips at the corresponding wavenumbers.From Drude model we can deduce the free carrier concentration of around 3×1017cm-3,which is comparable with Raman scattering result (not shown here).

    6 Conclusion

    We have shown two examples to illustrate the powerful method of using transfer matrix with a combination of different techniques that give similar results.This method is especially in the characterization of material properties.This method is suitable for various kinds of thin film materials even though in this paper we focus on wide bandgap semiconductor thin films.We can get film thickness and dispersion relation reliably,and then deduce the absorption oscillation mode in the ultraviolet-visiable region and infrared region.

    Acknowledgment

    The work at National Taiwan University was supported by Ministry of Science and Technology under contract No.NSC 102-2221-E-002-191-MY3 and NSC 98-2221-E-002-015-MY3.

    Reference

    [1] Yeh P.Electromagnetic propagation in birefringent layered media[J].J Opt Soc Am,1979,69:742-756.

    [2] Yeh P.Optics of anisotropic layered media:a new 4×4 matrix algebra[J].Surf Sci,1980,96:41-53.

    [3] Schubert M.Polarization-dependent optical parameters of arbitrarily anisotropic homogeneous layered systems[J].Phys Rev B,1996,53:4265-4274.

    [4] Schubert M.Theory and application of generalized ellipsometry,in Handbook of Ellipsometry[M].New York:Springer,2005:637-717.

    [5] Fujiwara H.Spectroscopic ellipsometry principles and applications[M].Hoboken:John Wiley & Sons Ltd,2007:158-176.

    [6] Forouhi A R,Bloomer I.Optical dispersion relations for amorphous semiconductors and amorphous dielectrics[J].Phys Rev B,1986,34:7018-7026.

    [7] Jellison G E,Modine F A.Parameterization of the optical functions of amorphous materials in the interband region[J].Appl Phys Lett,1996,69:371-373.

    [8] Meneses D D S,Malki M,Echegut P.Structure and lattice dynamics of binary lead silicate glasses investigated by infrared spectroscopy[J].Journal of Non-Crystalline Solids,2006,352:769-776.

    [9] Tiwald T E,Thompson D W,Woollam J A,etal.Application of IR variable angle spectroscopic ellipsometry to the determination of free carrier concentration depth profiles[J].Thin Solid Films,1998,313:661-666.

    [10] Tanguy C.Analytical expression of the complex dielectric function for the Hulthén potential[J].Phys Rev B,1999,60:10660-10663.

    [11] Feng Z C,Yang T R,Hou Y T.Infrared reflectance analysis of GaN epitaxial layers grown on sapphire and silicon substrates[J].Materials Science in Semiconductor Processing,2001,4:571-576.

    [12] Palik E D.Handbook of Optical Constants of Solids[M].New York:Academic Press,1985.

    Characterization of Optical Properties of Wide Band Gap Semiconductor Thin Film with the Combination of Ellipsometry and Infrared Spectrum

    XIE Deng1,2,QIU Zhi-ren2*,WAN Ling-yu3,TIN Chin-che4,5,MEI Ting6,FENG Zhe-chuan3

    (1.InstituteofOptoelectronicMaterialandTechnology,SouthChinaNormalUniversity,Guangzhou510631,China;2.StateKeyLaboratoryofOptoelectronicMaterialsandTechnologiesandSchoolofPhysics,SunYat-SenUniversity,Guangzhou510275,China;3.CollegeofPhysicsScience&Technology,GuangxiKeyLaboratoryfortheRelativisticAstrophysics,Laboratoryofoptoelectronicmaterials&detectiontechnology,GuangxiUniversity,Nanning530004,China;4.DepartmentofMechanicalEngineering,UniversityofMalaya,50603KualaLumpur,Malaysia;5.DepartmentofPhysics,AuburnUniversity,Auburn,Alabama36849,U.S.A.;6.TheKeyLaboratoryofSpaceAppliedPhysicsandChemistry,MinistryofEducationandShaanxiKeyLaboratoryofOpticalInformationTechnology,SchoolofScience,NorthwesternPolytechnicalUniversity,Xi’an710072,China)

    Wide band gap semiconductor films,including silicon carbide (SiC),gallium nitride (GaN),zinc oxide (ZnO) and their compounds and isomers,posess a band gap larger than 3.2 eV,and the characteristic phonon peak lies between 100 and 1500 cm-1.There are many methods to determine the band width and the characteristic phonon peaks,such as photoluminescence,Raman scattering and optical transmission spectraetc. Here we propose a combination of spectroscopic ellipsometry and Fourier transform infrared reflection spectrum analysis by transfer matrix method,which can determine the dispersion spectra and film thickness simultaneously,ranging from ultra-violet (around 250 nm) to far infrared (about 22000 nm).We construct an optical function model based on harmonic oscillator,and demonstrate that the model is suitable for simulating the resonance absorption of incident light with various wavelengths.

    spectroscopic ellipsometry; Fourier transform infrared spectroscopy; transfer matrix method

    2015-06-15; 修改稿日期:2015-09-21

    中山大學(xué)光電材料與技術(shù)國家重點(diǎn)實(shí)驗(yàn)室開放課題,國家自然科學(xué)基金(11474365,61377055,61176085);廣東高校國際科技合作創(chuàng)新平臺項(xiàng)目(gjhz1103);廣西相對論天體物理重點(diǎn)實(shí)驗(yàn)室廣西自然科學(xué)基金創(chuàng)新團(tuán)隊(duì)項(xiàng)目(2013GXNSFFA019001),國家自然科學(xué)基金(AE0520088)

    謝燈(1988-),男,博士,從事寬禁帶半導(dǎo)體材料表征分析研究。E-mail:xiedeng5@126.com

    丘志仁(1963-),男,副教授,主要從事超快激光脈沖產(chǎn)生技術(shù)和時間、空間及光譜分辨技術(shù)與應(yīng)用,半導(dǎo)體材料光物理及器件研究等。E-mail:stsqzr@mail.sysu.edu.cn

    1004-5929(2016)03-0214-06

    O433.3,O484.5

    A

    10.13883/j.issn1004-5929.201603004

    猜你喜歡
    光電子禁帶光譜
    先進(jìn)微電子與光電子材料與器件專題引言
    基于三維Saab變換的高光譜圖像壓縮方法
    壓電周期板中耦合禁帶影響規(guī)律分析
    寬絕對禁帶的一維磁性光子晶體結(jié)構(gòu)?
    星載近紅外高光譜CO2遙感進(jìn)展
    基于介質(zhì)圓柱結(jié)構(gòu)的復(fù)式二維光子晶體禁帶研究
    Franck-Condon因子計(jì)算及甲醛光電子能譜的理論研究
    寬禁帶固態(tài)功放在導(dǎo)航衛(wèi)星中的應(yīng)用
    苦味酸與牛血清蛋白相互作用的光譜研究
    先進(jìn)顯示與光電子技術(shù)國家重點(diǎn)實(shí)驗(yàn)室
    液晶與顯示(2014年2期)2014-02-28 21:12:59
    国产又色又爽无遮挡免| 九色亚洲精品在线播放| 国产在线一区二区三区精| 热99久久久久精品小说推荐| 最近最新中文字幕大全免费视频 | 99热6这里只有精品| 女人被躁到高潮嗷嗷叫费观| 在线精品无人区一区二区三| 国产精品成人在线| 午夜福利网站1000一区二区三区| 精品卡一卡二卡四卡免费| 成人影院久久| 国产麻豆69| 亚洲av.av天堂| 国产欧美另类精品又又久久亚洲欧美| 如日韩欧美国产精品一区二区三区| 免费看光身美女| 99久国产av精品国产电影| 美女福利国产在线| 王馨瑶露胸无遮挡在线观看| 天美传媒精品一区二区| 亚洲精品久久午夜乱码| 免费av中文字幕在线| 搡老乐熟女国产| 日日爽夜夜爽网站| 一级毛片我不卡| 久久久久网色| 人妻少妇偷人精品九色| 三级国产精品片| 欧美成人精品欧美一级黄| 蜜桃国产av成人99| 新久久久久国产一级毛片| 一区二区日韩欧美中文字幕 | 女人精品久久久久毛片| 高清欧美精品videossex| 新久久久久国产一级毛片| 五月开心婷婷网| av免费观看日本| 亚洲国产精品一区三区| 免费看av在线观看网站| 99国产精品免费福利视频| 免费高清在线观看视频在线观看| 9色porny在线观看| 天堂俺去俺来也www色官网| 午夜福利乱码中文字幕| 日韩一本色道免费dvd| 又粗又硬又长又爽又黄的视频| 亚洲成人手机| 国产色爽女视频免费观看| 色网站视频免费| 日韩制服骚丝袜av| 久久午夜福利片| 九九爱精品视频在线观看| 免费大片黄手机在线观看| 观看av在线不卡| 日本爱情动作片www.在线观看| 超碰97精品在线观看| 色5月婷婷丁香| av在线观看视频网站免费| 伦理电影免费视频| 国产无遮挡羞羞视频在线观看| 一本一本久久a久久精品综合妖精 国产伦在线观看视频一区 | 22中文网久久字幕| 国产日韩一区二区三区精品不卡| 香蕉精品网在线| 欧美激情极品国产一区二区三区 | 国产亚洲精品第一综合不卡 | 麻豆精品久久久久久蜜桃| 日韩在线高清观看一区二区三区| 免费在线观看黄色视频的| 99久久综合免费| 久久人人97超碰香蕉20202| 成年人免费黄色播放视频| 欧美人与性动交α欧美精品济南到 | 免费av不卡在线播放| 视频区图区小说| 亚洲,一卡二卡三卡| 国产一级毛片在线| 日韩熟女老妇一区二区性免费视频| 免费播放大片免费观看视频在线观看| 国产在视频线精品| videos熟女内射| 欧美日韩一区二区视频在线观看视频在线| 亚洲内射少妇av| 日韩 亚洲 欧美在线| 亚洲人成网站在线观看播放| 亚洲精品自拍成人| 亚洲,一卡二卡三卡| 韩国精品一区二区三区 | 中文乱码字字幕精品一区二区三区| 成年女人在线观看亚洲视频| 男的添女的下面高潮视频| 色哟哟·www| 最近的中文字幕免费完整| 欧美老熟妇乱子伦牲交| 成人国产麻豆网| 99九九在线精品视频| 97在线人人人人妻| 伊人亚洲综合成人网| 一级毛片电影观看| 纯流量卡能插随身wifi吗| 看十八女毛片水多多多| 国产亚洲欧美精品永久| 狂野欧美激情性bbbbbb| 久久久久国产网址| 一本色道久久久久久精品综合| 欧美国产精品va在线观看不卡| 亚洲国产看品久久| 肉色欧美久久久久久久蜜桃| 亚洲综合色惰| 国产 精品1| 三上悠亚av全集在线观看| 国产一区二区激情短视频 | 人妻人人澡人人爽人人| 97超碰精品成人国产| 中文欧美无线码| 久久青草综合色| 内地一区二区视频在线| 日韩人妻精品一区2区三区| 欧美性感艳星| 国产亚洲av片在线观看秒播厂| 天堂中文最新版在线下载| 国产精品三级大全| 久久久久久人人人人人| 最近最新中文字幕大全免费视频 | 国产男女超爽视频在线观看| 欧美另类一区| 欧美成人精品欧美一级黄| 亚洲人成77777在线视频| 黑人高潮一二区| 久久精品夜色国产| 久久久国产精品麻豆| 成人国语在线视频| 久久精品久久久久久久性| 一本大道久久a久久精品| 精品一区二区三卡| 五月伊人婷婷丁香| 亚洲精品日本国产第一区| 国产精品人妻久久久久久| 国产 一区精品| av卡一久久| 日本91视频免费播放| 边亲边吃奶的免费视频| 久久国产亚洲av麻豆专区| 国产日韩欧美亚洲二区| 免费高清在线观看视频在线观看| 国产成人免费无遮挡视频| 精品亚洲成国产av| 免费高清在线观看视频在线观看| 婷婷色综合www| 午夜福利乱码中文字幕| 五月伊人婷婷丁香| 成年人午夜在线观看视频| 午夜免费男女啪啪视频观看| 日本vs欧美在线观看视频| www日本在线高清视频| 热99久久久久精品小说推荐| av免费在线看不卡| 成人二区视频| 永久免费av网站大全| 色哟哟·www| 久热久热在线精品观看| 欧美精品人与动牲交sv欧美| 日本爱情动作片www.在线观看| av在线app专区| 22中文网久久字幕| 午夜老司机福利剧场| 久久婷婷青草| 男人操女人黄网站| 男人爽女人下面视频在线观看| 国产精品不卡视频一区二区| 免费在线观看黄色视频的| 热99国产精品久久久久久7| 午夜免费男女啪啪视频观看| 成人国语在线视频| 欧美成人午夜精品| 成人亚洲精品一区在线观看| 男女国产视频网站| 男女午夜视频在线观看 | 自线自在国产av| 久久99一区二区三区| 亚洲国产精品一区三区| 国产日韩欧美亚洲二区| 91国产中文字幕| av国产久精品久网站免费入址| 久久婷婷青草| www.色视频.com| 人妻少妇偷人精品九色| 岛国毛片在线播放| 精品一区在线观看国产| 精品亚洲成a人片在线观看| 男女啪啪激烈高潮av片| av国产久精品久网站免费入址| 两个人免费观看高清视频| 69精品国产乱码久久久| av不卡在线播放| 日韩成人伦理影院| 亚洲av福利一区| 黄色 视频免费看| 在线天堂最新版资源| 成人漫画全彩无遮挡| 久久精品国产a三级三级三级| 天天躁夜夜躁狠狠久久av| 中文字幕av电影在线播放| 亚洲第一av免费看| 亚洲av成人精品一二三区| 最近2019中文字幕mv第一页| 欧美激情极品国产一区二区三区 | 精品人妻熟女毛片av久久网站| 99热网站在线观看| 一级黄片播放器| 色94色欧美一区二区| 精品一区在线观看国产| 久久久a久久爽久久v久久| 街头女战士在线观看网站| 美国免费a级毛片| 国产精品不卡视频一区二区| 久久久久久伊人网av| 一级黄片播放器| 欧美日韩综合久久久久久| 激情五月婷婷亚洲| av在线老鸭窝| 精品久久久久久电影网| 婷婷色av中文字幕| 亚洲av日韩在线播放| 精品少妇久久久久久888优播| 国产又爽黄色视频| 国产麻豆69| 三级国产精品片| 免费观看av网站的网址| 热re99久久国产66热| 国产av一区二区精品久久| 亚洲伊人久久精品综合| 黄色 视频免费看| 亚洲av欧美aⅴ国产| 亚洲,一卡二卡三卡| 国产av一区二区精品久久| www.色视频.com| 久久精品久久久久久久性| 99精国产麻豆久久婷婷| 久久韩国三级中文字幕| 欧美人与善性xxx| 久久人人爽人人爽人人片va| 久久久国产欧美日韩av| 最新中文字幕久久久久| 久久精品久久久久久久性| 久久99一区二区三区| 日日摸夜夜添夜夜爱| 80岁老熟妇乱子伦牲交| 国产欧美另类精品又又久久亚洲欧美| 高清毛片免费看| 18在线观看网站| 国产精品久久久久成人av| 国产探花极品一区二区| 男女国产视频网站| av在线老鸭窝| 亚洲av.av天堂| 婷婷成人精品国产| 免费人妻精品一区二区三区视频| 九色亚洲精品在线播放| 午夜福利网站1000一区二区三区| 性色avwww在线观看| 在线精品无人区一区二区三| 久久影院123| 又黄又爽又刺激的免费视频.| 哪个播放器可以免费观看大片| 曰老女人黄片| 永久网站在线| 亚洲精品国产av成人精品| 九草在线视频观看| 观看美女的网站| 成人午夜精彩视频在线观看| 国产激情久久老熟女| 亚洲精品一区蜜桃| 美女主播在线视频| 美女视频免费永久观看网站| 91aial.com中文字幕在线观看| 午夜激情av网站| 熟女电影av网| 好男人视频免费观看在线| 十八禁网站网址无遮挡| 欧美日韩视频高清一区二区三区二| 日韩电影二区| 国产亚洲欧美精品永久| 精品一区二区三卡| 欧美精品国产亚洲| tube8黄色片| 99热国产这里只有精品6| 激情视频va一区二区三区| 高清黄色对白视频在线免费看| 久久精品国产综合久久久 | 老司机影院成人| 久久女婷五月综合色啪小说| 亚洲精品av麻豆狂野| 国产毛片在线视频| 中文字幕最新亚洲高清| 一区二区日韩欧美中文字幕 | 九九爱精品视频在线观看| 两性夫妻黄色片 | 久久精品aⅴ一区二区三区四区 | 精品第一国产精品| 热99久久久久精品小说推荐| 精品一区在线观看国产| 午夜免费男女啪啪视频观看| 国产亚洲最大av| 日本欧美视频一区| 在线观看三级黄色| 精品亚洲成国产av| 最近最新中文字幕免费大全7| 天天躁夜夜躁狠狠躁躁| 国产国语露脸激情在线看| 韩国高清视频一区二区三区| 久久99蜜桃精品久久| 少妇人妻精品综合一区二区| 亚洲av中文av极速乱| 国产片特级美女逼逼视频| 国产av精品麻豆| 视频中文字幕在线观看| 亚洲国产精品999| 黑人猛操日本美女一级片| 亚洲三级黄色毛片| 国产国拍精品亚洲av在线观看| 国产亚洲精品第一综合不卡 | 日韩一区二区视频免费看| 日韩中文字幕视频在线看片| 久久国产精品男人的天堂亚洲 | 久久毛片免费看一区二区三区| 精品久久蜜臀av无| 高清在线视频一区二区三区| av免费在线看不卡| 一级爰片在线观看| 亚洲av福利一区| 老熟女久久久| 亚洲国产av影院在线观看| 国产成人欧美| 欧美日韩视频精品一区| 欧美3d第一页| 美女主播在线视频| 国产爽快片一区二区三区| 男人操女人黄网站| 中文字幕亚洲精品专区| 少妇人妻 视频| 亚洲国产成人一精品久久久| 成人国产麻豆网| 久久久久久久国产电影| 国产欧美日韩综合在线一区二区| 啦啦啦啦在线视频资源| 五月伊人婷婷丁香| 久久人人97超碰香蕉20202| av福利片在线| av线在线观看网站| 七月丁香在线播放| 巨乳人妻的诱惑在线观看| 日韩中文字幕视频在线看片| 国产精品麻豆人妻色哟哟久久| 十分钟在线观看高清视频www| 精品人妻一区二区三区麻豆| 一级毛片 在线播放| 日日啪夜夜爽| 99久久中文字幕三级久久日本| 新久久久久国产一级毛片| 极品人妻少妇av视频| 久久人人97超碰香蕉20202| 精品国产乱码久久久久久小说| 欧美日韩亚洲高清精品| 人人妻人人澡人人看| 九九爱精品视频在线观看| 亚洲欧美成人综合另类久久久| 成年av动漫网址| 国产极品粉嫩免费观看在线| 欧美成人午夜免费资源| 色婷婷av一区二区三区视频| 97在线人人人人妻| 大码成人一级视频| 80岁老熟妇乱子伦牲交| 亚洲av电影在线观看一区二区三区| 18禁国产床啪视频网站| 国产成人av激情在线播放| 亚洲在久久综合| 欧美日韩视频高清一区二区三区二| 亚洲,欧美精品.| 黑人欧美特级aaaaaa片| 黄色一级大片看看| 嫩草影院入口| 亚洲第一区二区三区不卡| 99久国产av精品国产电影| 午夜福利在线观看免费完整高清在| 大香蕉97超碰在线| 天天躁夜夜躁狠狠久久av| 在线免费观看不下载黄p国产| 男女啪啪激烈高潮av片| 啦啦啦啦在线视频资源| 日韩精品有码人妻一区| av黄色大香蕉| 久久人人爽人人爽人人片va| 国产成人午夜福利电影在线观看| 国产日韩一区二区三区精品不卡| 欧美日本中文国产一区发布| 卡戴珊不雅视频在线播放| 伦理电影大哥的女人| 男男h啪啪无遮挡| 色网站视频免费| 我要看黄色一级片免费的| 最近最新中文字幕大全免费视频 | 最新中文字幕久久久久| 久久精品国产a三级三级三级| 女人精品久久久久毛片| 日韩精品免费视频一区二区三区 | 免费少妇av软件| 精品午夜福利在线看| 秋霞伦理黄片| 欧美日韩视频高清一区二区三区二| 国产一区二区三区综合在线观看 | 男女下面插进去视频免费观看 | 亚洲熟女精品中文字幕| 久久精品国产a三级三级三级| 一级毛片 在线播放| 亚洲av成人精品一二三区| 熟妇人妻不卡中文字幕| 午夜激情久久久久久久| 精品国产一区二区三区四区第35| 国产精品三级大全| 亚洲成av片中文字幕在线观看 | 91精品国产国语对白视频| 成人亚洲精品一区在线观看| 春色校园在线视频观看| 交换朋友夫妻互换小说| 人妻系列 视频| 欧美亚洲 丝袜 人妻 在线| 亚洲精品中文字幕在线视频| 26uuu在线亚洲综合色| 亚洲av在线观看美女高潮| 精品久久久久久电影网| 美女中出高潮动态图| 国产视频首页在线观看| 欧美+日韩+精品| 校园人妻丝袜中文字幕| av有码第一页| 午夜福利影视在线免费观看| 久久久久久久久久久免费av| 亚洲综合精品二区| 边亲边吃奶的免费视频| 黄网站色视频无遮挡免费观看| 哪个播放器可以免费观看大片| 久久久久久久大尺度免费视频| 精品国产一区二区久久| 丁香六月天网| 多毛熟女@视频| 国产毛片在线视频| 日韩成人av中文字幕在线观看| 黄色配什么色好看| 免费观看无遮挡的男女| 成年人免费黄色播放视频| 亚洲情色 制服丝袜| 久久久久国产网址| 99久久综合免费| 亚洲,欧美,日韩| 国产高清国产精品国产三级| 性高湖久久久久久久久免费观看| 一区二区三区乱码不卡18| 欧美精品人与动牲交sv欧美| 999精品在线视频| 国产在线免费精品| av又黄又爽大尺度在线免费看| 成人综合一区亚洲| 在线精品无人区一区二区三| 男男h啪啪无遮挡| 大话2 男鬼变身卡| 国产乱来视频区| 国产 一区精品| 三上悠亚av全集在线观看| 日韩大片免费观看网站| 久久婷婷青草| 黄片播放在线免费| 国产成人精品在线电影| 熟女人妻精品中文字幕| 最黄视频免费看| 老女人水多毛片| 啦啦啦在线观看免费高清www| 中国美白少妇内射xxxbb| 看免费av毛片| 狠狠婷婷综合久久久久久88av| 水蜜桃什么品种好| 欧美bdsm另类| 国产高清三级在线| av天堂久久9| 久久精品人人爽人人爽视色| 丝袜脚勾引网站| 男人操女人黄网站| 久久久久久久亚洲中文字幕| 久久久久人妻精品一区果冻| 久久精品人人爽人人爽视色| 人妻少妇偷人精品九色| 久久精品国产自在天天线| tube8黄色片| 中国国产av一级| 免费av不卡在线播放| 熟女人妻精品中文字幕| 国产极品粉嫩免费观看在线| 日韩电影二区| 高清不卡的av网站| 亚洲欧美精品自产自拍| 在线观看www视频免费| 哪个播放器可以免费观看大片| 一个人免费看片子| 精品久久蜜臀av无| 99国产精品免费福利视频| 精品国产国语对白av| 九九在线视频观看精品| 亚洲精品第二区| 欧美bdsm另类| 在线观看免费视频网站a站| av在线播放精品| 日本黄大片高清| 妹子高潮喷水视频| 一本—道久久a久久精品蜜桃钙片| 另类亚洲欧美激情| 男男h啪啪无遮挡| 一级片免费观看大全| 国产爽快片一区二区三区| 午夜福利乱码中文字幕| 在线观看三级黄色| 少妇 在线观看| 亚洲一区二区三区欧美精品| 国产乱来视频区| av免费观看日本| 亚洲精品一区蜜桃| av又黄又爽大尺度在线免费看| 成年女人在线观看亚洲视频| 91久久精品国产一区二区三区| 久热这里只有精品99| 在线观看国产h片| 一本一本久久a久久精品综合妖精 国产伦在线观看视频一区 | 亚洲熟女精品中文字幕| 一边摸一边做爽爽视频免费| 国产黄频视频在线观看| 午夜精品国产一区二区电影| 亚洲欧洲国产日韩| 新久久久久国产一级毛片| 国产男人的电影天堂91| 另类亚洲欧美激情| 免费观看性生交大片5| 伦理电影大哥的女人| 一区二区三区乱码不卡18| 大话2 男鬼变身卡| 久久久久网色| 国产精品偷伦视频观看了| 18禁观看日本| 菩萨蛮人人尽说江南好唐韦庄| 涩涩av久久男人的天堂| 九色成人免费人妻av| 亚洲欧美成人精品一区二区| 最近中文字幕高清免费大全6| 亚洲中文av在线| 国产精品久久久久成人av| 一级,二级,三级黄色视频| 美女视频免费永久观看网站| 日本wwww免费看| 亚洲欧美色中文字幕在线| 欧美日韩精品成人综合77777| 欧美日韩亚洲高清精品| 五月伊人婷婷丁香| 亚洲少妇的诱惑av| 有码 亚洲区| 免费在线观看完整版高清| 久久 成人 亚洲| av.在线天堂| 国产 精品1| 中文欧美无线码| 九九爱精品视频在线观看| 婷婷色综合大香蕉| 欧美成人精品欧美一级黄| 26uuu在线亚洲综合色| 91成人精品电影| 18禁裸乳无遮挡动漫免费视频| 国产乱人偷精品视频| 久久久久视频综合| 日韩欧美一区视频在线观看| 欧美精品av麻豆av| 亚洲欧美成人精品一区二区| 在线观看美女被高潮喷水网站| 人妻一区二区av| 爱豆传媒免费全集在线观看| 国产精品免费大片| 久久久久久久亚洲中文字幕| 高清av免费在线| 亚洲,欧美精品.| 欧美精品av麻豆av| 捣出白浆h1v1| 99九九在线精品视频| 日韩av在线免费看完整版不卡| 国产 精品1| 亚洲欧美成人综合另类久久久| 午夜免费观看性视频| 亚洲,一卡二卡三卡| 欧美xxⅹ黑人| 久久精品久久久久久久性| 色吧在线观看| 18禁国产床啪视频网站| 最后的刺客免费高清国语| 母亲3免费完整高清在线观看 | 日韩三级伦理在线观看| 国产成人午夜福利电影在线观看| 在线观看免费高清a一片| 永久免费av网站大全| 国产一级毛片在线| 亚洲精品色激情综合| 人人妻人人爽人人添夜夜欢视频| 丰满少妇做爰视频| 亚洲精品日韩在线中文字幕| 精品99又大又爽又粗少妇毛片| 久久久国产一区二区| 国产在线视频一区二区| 最近手机中文字幕大全| 国产精品偷伦视频观看了|