Abstract SrTiO3 (STO) thin films were deposited on p-Si(100) substrates at various substrate temperatures from 300℃ to 700℃ by radio frequency (RF) magnetron sputtering technique. Their structure and electrical properties were investigated. It was found that the transition from amorphous phase to polycrystalline phase occurred at the substrate temperatures 300--400℃. Their crystallinity became better when the substrate temperatures further increased. The dielectric and leakage current measurements were carried out by using the Si/STO/Pt metal--insulator--semiconductor (MIS) structures at room temperature. It was found that the fixed charge density decreased and both the interface trap density and the dielectric constant increased when the substrate temperatures were increased. The leakage current mechanisms for STO MIS structures with STO films prepared at 700℃ followed the space charge limited current (SCLC) under the low applied electric field and the Poole--Frenkel emission under the high one. In addition, the resistivity for films prepared at 700℃ was higher than 1011 $\Omega\cdot$cm under the voltage lower than 10V (corresponding to the electric field of $1.54\times$ 103kV$\cdot$cm-1). It suggested that the STO films prepared at 700℃ were suitable for acting as the insulator of metal--ferroelectric--insulator--semiconductor (MFIS) structures.
Received: 16 December 2004
Revised: 12 May 2005
Accepted manuscript online:
Fund: Project supported by National Natural Science Foundation (Grant Nos 60221502 and 60223006) and Shanghai R&D Foundation for Applied Materials (Grant No 0316).
Cite this article:
Ma Jian-Hua (马建华), Meng Xiang-Jian (孟祥建), Lin Tie (林铁), Liu Shi-Jian (刘世建), Zhang Xiao-Dong (张晓东), Sun Jing-Lan (孙璟兰), Chu Jun-Hao (褚君浩) Structural and electrical properties of SrTiO3 thin films as insulator of metal--ferroelectric--insulator--semiconductor (MFIS) structures 2005 Chinese Physics 14 2352
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