(BiFeO_3)_(25)/(La_(0.7)Sr_(0.3)MnO_3)_(25)多层膜的光学和电学性质  

Optical and electrical characterization of (BiFeO_3)_(25)/(La_(0.7)Sr_(0.3)MnO_3)_(25) multilayered thin films

作　　者：姜平[1] 司道伟[1] 朱晖文[1] 李培刚[1] 王顺利[1] 崔灿[1] 唐为华[1] 

机构地区：[1]浙江理工大学物理系光电材料与器件中心,杭州310018

出　　处：《物理学报》2011年第11期574-578,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51072182;60806045);国家重点基础研究发展计划(批准号:2010CB933501);浙江自然科学基金创新团队项目(批准号:R4090058);浙江省大学生科技创新项目(批准号:2009R406013)资助的课题~~

摘　　要：采用射频磁控溅射方法在(001)SrTiO3衬底上制备(001)取向的(BiFeO3)25/(La0.7Sr0.3MnO3)25多层膜.光学测试结果表明,1.3—2.1eV范围内,相对于衬底而言多层膜光吸收增强;BiFeO3的带隙为2.7eV.另外,结合绝缘介质导电模型分析了所测得的电流-电压数据,在所测试的温度及电压下,所制备的(BiFeO3)25/(La0.7Sr0.3MnO3)25多层膜的导电机理由空间电荷限制电导主导.（001） oriented（BiFeO3）25/（La0.7Sr0.3MnO3）25 multilayered thin films are fabricated on （001）SrTiO3 substrate by rf-magnetron sputtering.UV-vis absorption spectrum analysis in a photon energy range of 1.2—6.4 eV is carried out,and the result shows that in a range of 1.3—2.1 eV the absorption is enhanced compared with that on SrTiO3 substrate.And the optical band gap of BiFeO3 is around 2.7 eV,which is in accordance with other reportsed results very well.Furthermore,the current-voltage curves are measured in a temperature range of 100—300 K,and the analyses according to several dielectric conduction models exhibite that the space-charge-limited conduction is dominated in the fabricated （BiFeO3）25/（La0.7Sr0.3MnO3）25 multilayered thin films.

关 键 词：多层膜 吸光度 空间电荷限制电导 

分 类 号：O484.4[理学—固体物理]