摘要
采用超声喷雾热分解(U ltrason ic Spray Pyrolysis,USP)方法,以醋酸锌、醋酸镁、醋酸铵、氯化铝的混合水溶液为前驱溶液,在单晶S i(100)衬底上制备了ZnO,Zn0.81Mg0.19O,N-A l共掺杂ZnO和N-A l共掺杂Zn0.81Mg0.19O薄膜。以X射线衍射(XRD)、场发射-扫描电镜(FE-SEM)、霍尔效应(Hall-effect)、光致发光(Photolum inescence,PL)谱等手段研究了薄膜的晶体结构、表面形貌、电学性能、光学性能和带隙变化。电学测试结果表明,未掺杂ZnO及Zn0.81Mg0.19O薄膜为n型导电;而N-A l共掺杂ZnO和N-A l共掺杂Zn0.81Mg0.19O薄膜呈p型导电。Zn0.81Mg0.19O和N-A l共掺杂Zn0.81Mg0.19O(p型)薄膜在维持ZnO纤锌矿结构的前提下,光学带隙随Mg掺杂量增加而增大。初步结果显示,优化工艺参数下通过Mg掺杂制备光学带隙可调的p型Zn0.81Mg0.19O薄膜,对于试制Zn1-xMgxO基同质p-n结、短波长(紫外、深紫外)器件等方面有重要意义。
ZnO, N-Al codoped ZnO, Zn0.81Mg0.19O, N-Al codoped Zn0.81Mg0.19O thin films have been deposited on Si（100） substrates as the precursory sources of Zn（CH3COO）2, Mg（CH3COO）2, NH4CH3COO and AlCl3 aqueous solutions using ultrasonic spray pyrolysis （USP） method. The crystalline structure, morphology images, electrical, optical properties and band gap of the films are characterized by X-ray diffraction （ XRD）, field emission-scan electron microscopic image （FE-SEM）, Hall-effect measurement and photoluminescence （PL）. The XRD patterns reveal that all the films are composed of wurtzite-type ZnO phase. No peak originating from other compounds is detected except those of ZnO. From the SEM images, we can see that all the films present good morphologic uniformity, smooth dense surface, no＂ visible pores and defects over the film. Apart from that, there are some grain morphology differences between Zn0.81Mg0.19O and p-Zn0.81Mg0.19O films, perhaps due to the different nucleation modes resulted from different dopants. Hall-effect measurement results indicate that ZnO and Zn0.81Mg0.19O are n-type, while N-Al codoped ZnO and N-Al codoped Zn0.81Mg0.19O exhibit p-type conductivity. From the PL peaks of ZnO and Zn0.81Mg0.19O, it can be seen that Zn0.81Mg0.19O is tuned into shorten wavelength than pure ZnO. Furthermore, the photoluminescence peak of p-addition, The growth rate dependence of electrical and PL properties in p-Zn1-xMgxO films are also discussed. Only upon moderate growth rate, the p-Zn0.81Mg0.19O film exhibits both good electrical and excellent PL properties. In conclusion, optimal growth conditions confirm that Zn0.81Mg0.19O films, both wide band gap and p-type conductivity, are successfully fabricated by codoping of N and Al using USP method, which are of significant importance for practical applications of Zn1-xMgxO p-n homojunctions and Zn1-xMgxO-based UV optoelectrical devices.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2006年第4期503-508,共6页
Chinese Journal of Luminescence
基金
国家自然科学基金(90401010)
上海市科技发展基金(046105009)
上海市应用材料研究与发展基金(0516)资助项目
