熱蒸發(fā)法制備厘米級(jí)ZnO晶須及特性研究.pdf

1、；：矢普碩士學(xué)位論文、，，￥9078‘熱蒸發(fā)法制備厘米級(jí)znO晶須及特性研究作者姓名：明亮指導(dǎo)教師：季振國(guó)教授本課題承：國(guó)家自然科學(xué)基金(No60576063)、教育部博士點(diǎn)基金(No20050335036)和十五“985”等項(xiàng)目的資助oo五年六月⑨塑堊查蘭堡圭蘭些堡蘭一一墊蔓絲鯊型魚(yú)里鲞絲j!!曼塑墨塹絲塑塞AbstraCtAsacompoundsemlconductorwlththeband‘wldthot337eVandtheex

2、itonbindingenergeof60meVatroomtemperatureZnOhasmanypotentialapplicationsinshortwaVelen百hoptoelectmnicdeVices，includinglightemittingdiodes(LEDs)，laserdiodes(LDs)，ultravioletdetectors，h嚕h舶quencya11dhi曲powerdevicesetcTherea

3、reonlyseverallaboratoriesabroadthathavethecapabilitytoproducebulkqualityZnOsinglecrystalintheworldandnodomesticreportaboutpreparationofbulk—qualityZnOsinglecrystalwaspublishedCentimeter—longZnOWhiskershavebeenpreparedbyo

4、urteamwithtllesimpletechniqueofthereductante11|lancedthernlalevapor“onofZnOpowdersTheZnOwhiskerspreparedingraplitecmciblewerecharacterizedbySEM(ScanningElectronMicroscopy)，TEM(TraIlsparentElectronMicroscopy)，SAED(selecte

5、dAreaElectronDim。action)andxRD(x—RayDi脅ction)atfirstThesewhjskersaresinglecrystalandhavethehexagonal、vLIrtzitestructure，theaVeragelengtllof2cmwjt上ltherangeof14cmajldtheaveragedi鋤eterofl5斗mwiththerangeof5—20pmThenCarbonpo

6、wderswereemployedasrcductalltandtheresultshowsG盯bonpowdershaVethesaITlereductionaswellasgriphtecrucibleSoakindofreduct￡mtwitllexcellentpropertya11d10wpricewasfbulldaIldcanbeusedinthe1arge—scalemanufactureofZnOinthemtLIre

7、The掣oⅢhofZnOwhiskersisdetenllinedmainlybytwoconsiderations：oneisthesupersaturationofZnOabovethesubs訂ates，andtheotheristhecrystalljza“onhabitofZnOmaterialitselfThesupersaturationofZnOabovet11esubstratscanbedetemlinedbycon

8、trollingtheconcen廿ationofZnvaporabovesubstratesandthegradsoftemperaturebetweenresourceaJldsubs似esThemorphologyofzn0whiskerswereaflfectedbytheratioofZnO：Candthecoolingmech肌ismUndertheconditionoftheZnO：Cintheratioofl：2a11d

9、theaircoolingmechanism，tlleZnOwhiskersw“hlhedesiredquali可wereobtainedRoom—temperaturephotoluminescence(PL)measurememwerecamedouttocharacterizetheopticalpropeniesofZnOwhiskersusinganexcitationwavelenght1of325IlrnOnlyanarr