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Characteristics of Pt/YMnO3/Y2O3/Si structure using a Y2O3 buffer layer grown by pulsed laser deposition

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5 Author(s)
Shin, Woong-Chul ; Department of Materials Engineering, Chungnam National University, Taejon 305-764, Korea ; Yang, Jung-Hwan ; Choi, Kyu-Jeong ; Jeon, Young-Ah
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The Pt/YMnO3/Y2O3/Si structure for a metal/ferroelectric/insulator/semiconductor (MFIS) field effect transistors was fabricated and the effect of a Y2O3 layer on the properties of MFIS structure was investigated. The Y2O3 thin films on p-type Si(111) substrate growth by pulsed laser deposition were crystallized along (111) orientation irrespective of the deposition temperatures. Ferroelectric YMnO3 thin films deposited directly on p-type Si (111) by metalorganic chemical vapor deposition resulted in a Mn deficient layer between Si and YMnO3. However, YMnO3 thin films having good quality and stoichiometric composition can be obtained by adopting a Y2O3 buffer layer. The memory window of the YMnO3 thin films with a Y2O3 film is greater than that of the YMnO3 thin films without a Y2O3 film after the annealing at 850 °C in vacuum ambient (100 mTorr). The memory window is 1.3 V at the applied voltage of 5 V. © 2001 American Vacuum Society.

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Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures  (Volume:19 ,  Issue: 1 )