2016年第63回応用物理学会春季学術講演会

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一般セッション(口頭講演)

13 半導体 » 13.3 絶縁膜技術

[20p-S221-1~17] 13.3 絶縁膜技術

2016年3月20日(日) 13:45 〜 18:15 S221 (南2号館)

渡邉 孝信(早大)、舟窪 浩(東工大)

17:15 〜 17:30

[20p-S221-14] New finding of ferroelectricity of N doped HfO2 films

〇(D)Xu Lun1、Nishimular Tomonori1、Shibayama Shigehisa1、Yajima Takeaki1、Migita Shinji2、Toriumi Akira1 (1.Univ. Tokyo、2.AIST)

キーワード:HfO2,ferroelectricity,N doping

The ferroelectricity of HfO2 can be enhanced by moderate cation doping, such as Si, Al, Y, Sr, and Zr. For Y doped HfO2, earlier reports indicate that tetragonal and cubic phases of HfO2 are stabilized due to trivalent Y doping induced oxygen vacancies (Vo). However, it is not well understood about the origin of HfO2 ferroelectricity, and if it is related to the Vo or local chemical bonds. Here, N doped HfO2 (N:HfO2) were investigated, and we observed that ferroelectricity of HfO2 is much more sensitive to N doping than Y doping. 0.7 mol% Y doping can maximize ferroelectricity while 0.1 mol% N doping is enough. Therefore, except Vo, we think Hf-N bonds need to be seriously considered for the ferroelectricity.