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arXiv 2012.00147cond-mat.mtrl-sci
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CuAl1-xFexO2光学性质的实验和计算研究

Experimental and Computational Studies of the Optical Properties of CuAl1-xFexO2

Mina Aziziha, Saeed Akbarshahi, Suresh Pittala, Sayandeep Ghosh, Rishmali Sooriyagoda, Aldo H. Romero, Subhash Thota, Alan D. Bristow, Mohindar S. Seehra, Matthew B. Johnson

摘要:

铜铁矿由于其化学稳定性和在太阳电磁波谱区域的吸收而成为有希望的超导应用的候选者。例如,CuAlO 2具有良好的化学稳定性,但具有大的间接带隙(~ 3eV),因此研究了通过合金化来改善其在太阳能区域中的吸收的努力。测量了稀合金化对粉末状CuAl_(1-x)Fe_xO_2(x = 0.0-1.0)光吸收的影响,并与采用Hubbard交换关联参数和自旋的广义梯度近似的电子能带结构计算结果进行了比较。一个新的吸收功能,观察到在1.8 eV的x = 0.01,红移到1.4 eV的x = 0.10。该特征与从L点价带最大值到Fe-3d状态的跃迁相关联,Fe-3d状态出现在自旋向下的能带结构的导带下方。该特征增加了纯CuAlO 2的带隙以下的光吸收,使得稀CuAl 1-xFexO 2合金更适合于太阳能电池。

英文摘要:

Delafossites are promising candidates for photocatalysis applications because of their chemical stability and absorption in the solar region of the electromagnetic spectrum. For example, CuAlO2 has good chemical stability but has a large indirect bandgap (~3 eV), so that efforts to improve its absorption in the solar region through alloying are investigated. The effect of dilute alloying on the optical absorption of powdered CuAl1-xFexO2 (x = 0.0-1.0) is measured and compared to electronic band structures calculations using a generalized gradient approximation with Hubbard exchange-correlation parameter and spin. A new absorption feature is observed at 1.8 eV for x = 0.01, which redshifts to 1.4 eV for x = 0.10. This feature is associated with transitions from the L-point valence band maximum to the Fe-3d state that appears below the conduction band of the spin-down band structure. The feature increases the optical absorption below the bandgap of pure CuAlO2, making dilute CuAl1-xFexO2 alloys better suited for solar photocatalysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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