Electro-Optic Effect in Epitaxial ZnO:Mn Thin Films
Electro-Optic Effect in Epitaxial ZnO:Mn Thin Films
复制标题
DOI：
10.1143/jjap.41.6916
复制
发表时间：
2002-11
影响因子：
1.5
通讯作者：
T. Nagata;A. Ashida;N. Fujimura;T. Ito
中科院分区：
文献类型：
--
作者：
T. Nagata;A. Ashida;N. Fujimura;T. Ito
研究了ZnO薄膜的电光效应。使用具有铁电性的ZnO与Li掺杂被认为是用于增强电光效应的解决方案之一。本文首先测量了未掺杂ZnO和Mn掺杂ZnO薄膜的双折射位移，作为评价ZnO：Li薄膜电光效应的第一步。未掺杂的ZnO薄膜由于漏电流大，介电性能差，没有电光响应。Mn掺杂到ZnO中导致大漏电流问题的显著改善。样品表现出线性的电光响应，我们成功地测量了在交流偏置电压频率高于10 kHz时由偶极极化率引起的电光效应。在该频率以下，电光响应包括空间电荷效应。
We have studied the electro-optic effect of ZnO films. The use of ZnO which exhibits ferroelectricity with Li doping is believed to be one of the solutions for enhancing the electro-optic effect. In this paper, the birefringence shift measurement was performed for nondoped ZnO and Mn-doped ZnO films as the first step for evaluating the electro-optic effect of ZnO:Li film. Nondoped ZnO film exhibited poor dielectric property and no electro-optic response has been observed due to its large leakage current. Mn doping to ZnO led to a significant improvement of the large leakage current problem. The sample showed a linear electro-optic response, and we succeeded in measuring the electro-optic effect induced by dipolar polarizability at the ac bias voltage frequency above 10 kHz. Below this frequency, the electro-optic response includes the space charge effect.