简介:摘要 本文对张应变的 Si基外延 Ge上 NiGe薄膜的热稳定性以及 NiGe与外延 Ge接触的电学特性进行了研究。通过四探针等测试结果,表明张应变外延 Ge上 NiGe薄膜的热稳定性比 N型 c-Ge上 NiGe薄膜的热稳定性提高了 100oC,可能的原因是 NiGe薄膜与张应变的外延 Ge之间的晶格失配较小, NiGe薄膜所受到的应力较小。 I-V测试结果表明 NiGe与外延 Ge接触反向漏电流较大,器件整流比较小,势垒高度比 NiGe/c-Ge的势垒高度小。因此,要使 NiGe更好的应用于外延 Ge基的肖特基势垒源漏的 MOSFET中,还需要进一步提高外延 Ge质量。
简介:<正>“Privacy”istranslatedasyinsiinChinese.Traditionally,intheChinesemind,yinsiisassociatedwithsomethingthatisclosedorunfair.Ifsomeoneissaidtohaveyinsi,meddlers(好事者)willbeattractedtopry(打探)intohisorheraffairs.Sopeoplealwaysstatethattheydon’thaveyinsi.
简介:TheinvestigationonopticalpropertiesofSi1-xGex/Sistrainedlayerstructureshasbeencarriedoutactivelyinrecentyears.Thephotoluminescencehasbe-comeabriskersubjectinthestudiesofitsvariousopticalproperties.Aresearchdevelop-menttophotoluminescencepropertiesofsomenewSi1-xGex/Sistrainedlayerstruc-turesisintroduced.
简介:本文介绍Si3N4(代替部分金刚石浓度)配合铁基(以Fe代Co)结合剂氮化金刚石薄膜涂层节块,可大大降低成本,该节块性能良好,有较高使用效果及经济效益。
简介:Theresidualelectricallyactivedefectsin(4×1012cm-2(30KeV)+5×1012cm-2(130KeV))si-implantedLECundopedsi-GaAsactivatedbytwo-steprapidthermalannealing(RTA)LABELEDAS970℃(9S)+750℃(12S)havebeeninvestigatedwithdeepleveltransientspec-troscopy(DLTS).TwoelectrontrapsET1(Ec-0.53eV,σn=2.3×10-16cm2)andET2(Ec-0.81eV,σn=9.7×10(-13)cm2)aredetected.Furthermore,thenoticeablevariationsoftrap’scon-centrationandenergylevelintheforbiddengapwiththedepthprofileofdefectsinducedbyionim-plantationandRTAprocesshavealsobeenobserved.The[Asi·VAs·AsGa]and[VAs·Asi·VGa·AsGa]areproposedtobethepossibleatomicconfigurationsofET1andET2,respectivelytoexplaintheirRTAbehaviors.
简介:PhotoconductivityCharacteristicsofPorousSi①CHAOZhanyun,WANGKaiyuan(DepartmentofElectronicEnginering,SoutheastUniversity,Nanji...
简介:PitformationandsurfacemorphologicalevolutioninSi(001)homoepitaxyareinvestigatedbyusingscanningtunnelingmicroscopy.Anti-phaseboundaryisfoundtogiverisetoinitialgenerationofpitsboundbybunchedDBsteps.Theterracesbreakupandarereducedtoacriticalnucleussizewithpitformation.Duetoanisotropickinetics,adownhillbiasdiffusioncurrent,whichislargeralongthedimerrowsthroughthecentreareaoftheterracethanthroughtheareaclosetotheedge,leadstotheprevalenceofpitsboundby{101}facets.Subsequentannealingresultsinashapetransitionfrom{101}-facetedpitstomulti-facetedpits.
简介:研究Al-Mg-Si合金晶界组成相(Al-Mg2Si及Al-Mg2Si-Si)间的电化学行为和动态电化学耦合行为,提出Al-Mg-Si合金的晶间腐蚀机理。研究表明,晶界Si的电位比其边缘Al基体的正,在整个腐蚀过程中作为阴极导致其边缘Al基体的阳极溶解;晶界Mg2Si的电位比其边缘Al基体的负,在腐蚀初期作为阳极发生阳极溶解,然而由于Mg2Si中活性较高的元素Mg的优先溶解,不活泼元素Si的富集,致使Mg2Si电位正移,甚至与其边缘Al基体发生极性转换,导致其边缘Al基体的阳极溶解。当n(Mg)/n(Si)〈1.73时,随着腐蚀的进行,合金晶界同时会有Mg2Si析出相和Si粒子,腐蚀首先萌生于Mg2Si相和Si边缘的无沉淀带,而后,Si粒子一方面导致其边缘无沉淀带严重的阳极溶解,另一方面加速Mg2Si和晶界无沉淀带的极性转换,从而促使腐蚀沿晶界Si粒子及Mg2Si粒子边缘向无沉淀带发展。
简介:Aconductionchannelmodelispropsedtoexplainthehighconductivitypropertyofnc-Si:H.Detailedenergybanddiagramisdevelopedbasedontheanalysisandcalculation,andtheconductivityofthenc-Si:Hwasthenanalysedonthebasisofenergybandtheory.Itisassumedthattheconductivityofthenc-Si:Hstemsfromtwoparts:theconductanceoftheinterface,wherethetransportmechanismisidentifiedasathermal-assistedtunnelingprocess,andtheconductancealongthechannelaroundthegrain,whichmainlydeterminedthehighconductivityofthenc-Si:H.Theconductivityofnc-Si:Hiscalculatedandcomparedwiththeexperimentdata.Thetheoryisinagreementwiththeexperiment.