Distinguishing Thermal and Electronic Effects in Ultrafast Optical Spectroscopy Using Oxide Heterostructures
Distinguishing Thermal and Electronic Effects in Ultrafast Optical Spectroscopy Using Oxide Heterostructures
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DOI：
10.1021/acs.jpcc.7b09592
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发表时间：
2018-01
影响因子：
3.7
通讯作者：
S. Smolin;A. Choquette;Jiayi Wang;S. May;J. B. Baxter
中科院分区：
文献类型：
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作者：
S. Smolin;A. Choquette;Jiayi Wang;S. May;J. B. Baxter
测量半导体中时间分辨的光激发性能对于轻度收获设备的设计和改进至关重要。并且需要适当地解释以隔离载体引起的贡献。 I型异质结构是隔离自然界的瞬态效应的一种手段，我们使用瞬态吸收和反射率光谱仪来测量时间分辨的光电上的光电上的光电上的外部双层双层。实验和完整的数值模型表明，热效应主导了拟合条带的瞬态抽象和反射光谱带有热差的动力学...
Measuring time-resolved photoexcited properties in semiconductors is critical to the design and improvement of light-harvesting devices. Although ultrafast pump–probe spectroscopy offers a promising route to understand carrier recombination mechanisms and quantify lifetimes, thermal contributions to the transient optical response can be significant and need to be properly accounted for to isolate carrier-induced contributions. We demonstrate the use of broadband ultrafast optical spectroscopy on type I heterostructures as a means to isolate transient effects that are solely thermal in nature. Specifically, we use transient absorption and reflectance spectroscopy to measure the time-resolved optoelectronic changes in photoexcited epitaxial bilayers of LaFeO3/LaMnO3 and monolithic thin films of these materials. Experiments and complementary numerical modeling reveal that thermal effects dominate the transient absorption and reflectance spectra above the band gap. Fitting the dynamics with a thermal diffusio...