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arXiv 1803.01375cond-mat.mtrl-sci
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Ba-Zr-S系统电子和光学性质的降维调谐

Tunability of electronic and optical properties of the Ba-Zr-S system via dimensional reduction

Y. Li, D. J. Singh

摘要:

过渡金属硫化物钙钛矿提供比氧化物更低的带隙和更大的可调谐性,以及用于应用的其他期望的性质。在这里,我们探索降维作为一种调整策略,使用Ruddlesden-Popper阶段的Ba-Zr-S系统作为一个模型。三维钙钛矿BaZrS $_3$是一种直接带半导体,具有适合于太阳能光伏应用的1.5 eV的带隙。然而,Ruddlesden-Popper系列的三个已知成员都是间接带隙材料,并且另外具有较低的基本带隙。在这种情况下,这伴随着能带结构,该能带结构更有利于取向样品的载流子传输。层状Ruddlesden-Popper化合物显示出显著的各向异性光学性质,正如所预期的。光谱在低能量下显示出拖尾,这可能使这些材料的实验表征复杂化。

英文摘要:

Transition metal sulfide perovskites offer lower band gaps and greater tunability than oxides, along with other desirable properties for applications. Here we explore dimensional reduction as a tuning strategy using the Ruddlesden-Popper phases in the Ba-Zr-S system as a model. The three dimensional perovskite BaZrS$_3$ is a direct band semiconductor, with a band gap of 1.5 eV suitable for solar photovoltaic application. However, the three known members of the Ruddlesden-Popper series, are all indirect gap materials, and additionally have lower fundamental band gaps. This is accompanied in the case of by a band structure that is more favorable for carrier transport for oriented samples. The layered Ruddlesden-Popper compounds, show significantly anisotropic optical properties, as may be expected. The optical spectra show tails at low energy, which may complicate experimental characterization of these materials.

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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