硅纳米线和多孔硅的制备与表面修饰分析

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1、AbstractPhotovoltaic(PV)technologiesrepresentpromisingroutestogreenandrenewableenergygeneration，Butowingtolowpowerconversionefficienciesofsolarcells，theDroductionofsotarenergyremainscostly．Theamountofreflectionfromasurface1Soneofthemainobstaclesinefficientsolarcellperfor

2、mance，andanothermaindifficultyinimprovingtheefficiencyofPVenergyconversionliesinthespect。almismatchbetweentheenergydistributionofphotonsintheincidentsolarspectnmaandthebandgapofasemiconductormaterial．Toincreasetheefficiencyofsingle-junctionsolarcells，ontheonehand，wecande

3、velopantireflectiontechnologicstoreducesurfacereflection，ontheotherhand，thespectralconverte。swhicharecapableofconvertingabroadspectrumoflightintophotonsofaparticularwavelengthcanbeemployedtominimizethelossesinthesolar-cell-basedenergyconversionprocess．TowardSthetwoissues

4、mentionedabove，wehaveasystematicresearchonthepropertiesofsiliconnanowiresandporoussilicon．Thesepropertiesincludereducedrerection，extremelighttrapping，andcanactasgooddown—shiftingphotoluminescencematerials．ButasthesematerialssufferfromtheageingproblemthatthePLintensitiesd

5、ecaydramaticallysubsequenttopreparation，SOthefeasibilityofusinghydrosilylationasageneraltooltostabilizethephotoluminescenceofsiliconnanowiresandporoussilicon．Besides，detailedresearcheswereconductedonthemechanismoffabricationprocess．Inthefollowingaretheinnovativeresultsof

6、thisthesis．(1)W色presentasystematicstudytoelucidatethemechanismresponsibleforthefon：11ationofsiliconnanowiresinatwostepsilver-assistedelectrolesschemicaletchingmethod．ItisshownthatsiliconnanowirearrayswithvariousmorphologlesandPLi【她nsitiescanbepreparedbyvaryingmultipleexp

7、erimentalparameterssuchastheresistivityofthestartingsiliconwafer，theconcentrationofoxidant(H20：)，oretchiIlgtimeoftheprocess．OurstudyalsoshowsaconsistentfiendthatthelengthandPLintensityofsiliconnanowiresincreaseswiththeincreasingofetchingtime，waferconductivity(forPtypewaf

8、er)andoxidant(H202)concentration，r2)Theantireflectionproperty(AR)ofsiliconnanowirearrays(SiNWAs)wascare