Heteroepitaxial Growth of a Ta3N5 Thin Film with Clear Anisotropic Optical Properties
Heteroepitaxial Growth of a Ta3N5 Thin Film with Clear Anisotropic Optical Properties
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具有清晰各向异性光学特性的 Ta3N5 薄膜的异质外延生长
DOI：
10.1021/acs.jpclett.1c03673
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Hasegawa Tetsuya
中科院分区：
文献类型：
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作者：
Wang Yannan;Hirose Yasushi;Wakasugi Takuto;Masubuchi Yuji;Tsuchii Masato;Sugisawa Yuki;Sekiba Daiichiro;Chikamatsu Akira;Hasegawa Tetsuya
Ta3N5是一种很有前景的半导体光催化剂，可以在可见光照射下从水中生成氢气。由于其高度各向异性的晶体结构，预计Ta3N5在其物理性质上表现出强烈的各向异性。然而，由于很难合成大的单晶，这种各向异性性质还没有得到实验验证。本文报道了在钙钛矿LaAlO_3衬底(110)面上用固相外延法制备(010)取向的Ta3N5单晶薄膜。得到的Ta3N5外延薄膜具有明显的光学各向异性(多色性)，正如先前的第一性原理计算所预测的那样。||[100]极化前的光学间隙(∼2.12 eV)小于||[100]极化前的光学间隙(∼2.27 eV)。
Ta3N5is a promising semiconductor photocatalyst which can generate H2gas from water under visible light illumination. It is expected that Ta3N5exhibits a strong anisotropy in its physical properties stemming from its highly anisotropic crystal structure. However, such anisotropic properties have not been verified experimentally due to the difficulty in synthesizing a large single crystal. Here, we report the synthesis of (010)-oriented Ta3N5single-crystalline thin films by solid phase epitaxy on the (110) plane of perovskite LaAlO3substrates. The obtained epitaxial thin films of Ta3N5exhibited clear optical anisotropy (pleochroism) as predicted by previous first-principles calculations. The optical gap forE||[100] polarization (∼2.12 eV) was smaller than that forE||[100] polarization (∼2.27 eV).