Optical spectroscopy study on the photo-response in multiferroic BiFeO3
Optical spectroscopy study on the photo-response in multiferroic BiFeO3
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DOI：
10.1063/1.4966548
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发表时间：
2016-10-31
影响因子：
4
通讯作者：
Kuntscher, C. A.
中科院分区：
文献类型：
--
作者：
Burkert, F.;Kreisel, J.;Kuntscher, C. A.
我们调查的光致伸缩效应在单晶BiFeO 3的透射率测量在红外和可见光频率范围内连续照明下的绿色激光（λ = 532 nm）的潜在机制。在透射光谱中的小的光致变化揭示了三个定义明确的吸收功能在1.22 eV，1.66 eV，和2.14 eV，我们分配到电荷转移激子和间隙中的缺陷状态可能与氧空位。对于高于90 W/m（2）的辐照度，三个吸收特征的强度遵循与照明强度的线性依赖关系。出版社：AIP Publishing
We investigate the underlying mechanism of the photostriction effect in single-crystalline BiFeO3 by transmission measurements in the infrared and visible frequency range under continuous illumination with a green laser (lambda = 532 nm). The small photo-induced changes in the transmission spectrum reveal three well-defined absorption features at 1.22 eV, 1.66 eV, and 2.14 eV, which we assign to charge-transfer excitons and in-gap defect states probably related to oxygen vacancies. The intensity of the three absorption features follows a linear dependence on the illumination intensity for an irradiance above 90 W/m(2). Published by AIP Publishing.