Electro-optic property of ZnO:Mn epitaxial films
Electro-optic property of ZnO:Mn epitaxial films
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ZnO:Mn外延薄膜的电光性能
DOI：
10.1002/pssc.200779246
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
N. Fujimura
中科院分区：
文献类型：
--
作者：
Takeshi Oshio;K. Masuko;A. Ashida;T. Yoshimura;N. Fujimura
研究了锰掺杂对氧化锌外延薄膜介电性能和电光性能的影响。掺杂浓度为3-5at%的Mn可显著降低氧化锌薄膜的漏电流。漏电流最小的氧化锌：4at%Mn晶体在1 kHz处具有最大的双折射频散(Δn)，其电光系数(RC)也大于氧化锌单晶。它可能是由另一种极化效应引起的，而不是自发极化，如空间电荷。为了探讨Δn分散的原因，对其放电性能进行了评价。当施加1 kHz的信号时，ZnO：3和5at%Mn显示出驰豫时间为5ms的放电。在未观察到Δn弥散的情况下，在20 kHz处观察到了具有相同弛豫时间的放电特性。然而，ZnO：4at%Mn并没有表现出这样的放电行为。因此，我们认为空间电荷不是Δn色散的来源，而Δn的色散是最小的，在20 kHz处没有观察到介电色散。在20 kHz下测得3，4和5at%Mn的Rc分别为0.81，0.81和0.62 pm/V，是自发偶极极化产生的Rc。(2018Wiley-VCH Verlag GmbH&Co.KGaA，Weinheim)
Mn doping effect on the dielectric and electro-optic (E-O) property of ZnO epitaxial films was studied. The leakage current of the ZnO film is drastically decreased by doping Mn with the concentration of 3-5 at%. Although, ZnO: 4 at% Mn with the lowest leakage current has the largest frequency dispersion of birefringence shift (Δ n) at 1 kHz, and its E-O coefficient (rc) was larger than that of ZnO single crystal. It is presumably caused by another polarization effect but spontaneous polarization, such as space charge. To investigate the origin of the dispersion of Δ n, discharging property was evaluated. When the signal at 1 kHz was applied, ZnO: 3 and 5 at% Mn showed the discharging with relaxation time of 5 msec. Furthermore, the discharging property with same relaxation time was observed at 20 kHz at where the dispersion of Δ n was not observed. However, ZnO: 4 at% Mn does not show such a discharging behavior. Therefore, it is considered that the space charge is not the origin of the dispersion of Δ n. On the other hand, the dispersion of Δ n was minimum and no dielectric dispersion was observed at 20 kHz for all samples. The rc of ZnO: 3, 4 and 5 at% Mn measured at 20 kHz, which should be the rc originated from the spontaneous dipolar polarization, were derived to be 0.81, 0.81 and 0.62 pm/V, respectively. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
影响因子：
1.5
作者：
T. Nagata;A. Ashida;N. Fujimura;T. Ito
通讯作者：
T. Nagata;A. Ashida;N. Fujimura;T. Ito