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中国物理学会期刊

Sb掺杂SrTio3透明导电薄膜的光电子能谱研究

CSTR: 32037.14.aps.51.187
CSTR: 32037.14.aps.51.187
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  • 用X射线光电子能谱和同步辐射光电子能谱研究了Sb掺杂的钙钛矿型氧化物SrTi1-xSbxO3(x=0.05,0.10,0.15,0.20)薄膜的电子结构.薄膜由紫外脉冲激光淀积在SrTiO3(001)单晶衬底上.该薄膜系列在可见光波段透明,透过率均超过90%.其导电性与掺杂浓度有关,当Sb掺杂浓度x=0.05时,薄膜显示金属型导电性.X射线光电子能谱和同步辐射光电子能谱研究结果表明,Sb掺杂在母化合物SrTiO3的禁带内引入了浅杂质能级和深杂质能级.浅杂质能级上的退局域化电子离化到导带中会产生一定的传导电

     

    OpticallytransparentSb dopedSrTiO3 (SrTi1-xSbxO3 )thinfilmswithatransmittancehigherthan 90 %invisibleregion havebeengrownonSrTiO3 (0 0 1 )substratesbypulsedlaserdepositionmethodusinganXeCllaserunderoxygenpartialpressureof2 0Pa.ThethinfilmwithSbdopingconcentrationofx=0 .0 5showsmetallic likeconductivitywitharesistivityρ~ 6.99×1 0 -3 Ω·cmatroomtemperature.XPSandsynchrotronradiationphotoelectronspectroscopy (SR PES)measurementfromtheSrTi0 . 95Sb0 .0 5O3 thinfilmrevealsthattheshallowanddeepimpuritydonorlevelswithinthebandgapoftheparentcompoundSrTiO3 areinducedbytheSbdoping.ThedelocalizedelectronswithintheshallowlevelsneartheFermilevelcanbeexcitedtotheconductionbandasfreecarriersforelectricalconductionbythermalionization.Thewidebandgap ,smalltransitionprobabilityandweakabsorptionduetothelowdensityofstatesintheimpuritylevelsresultintheopticaltransparencyofthefilm .

     

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