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arXiv 2103.17264cond-mat.mtrl-sci
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硫系钙钛矿光电性质的多体微扰理论研究

Optoelectronic Properties of Chalcogenide Perovskites by Many-Body Perturbation Theory

Manish Kumar, Arunima Singh, Deepika Gill, Saswata Bhattacharya

摘要:

硫属钙钛矿已经成为无毒且稳定的光伏材料,充当具有类似光电性质的铅卤化物混合钙钛矿的替代物。本文采用密度泛函理论(DFT)和多体微扰理论(MBPT,即G $_0$ W $_0$和BSE)研究了硫系钙钛矿化合物AZrS $_3$(A=Ca,Sr,Ba)的电子和光学性质。本研究包括上述系统的激子分析。发现激子结合能(E $_\textrm{B}$)大于卤化物钙钛矿的激子结合能,因为在前者中离子对介电屏蔽的贡献可以忽略。我们还观察到一个更稳定的电荷分离极化态相比,束缚激子。最后,直接间隙和吸收系数的基础上,估计的光谱限制的最大效率(SLME)的太阳能电池是大的,并建议这些钙钛矿在photoelectronics的适用性。

英文摘要:

Chalcogenide perovskites have emerged as non-toxic and stable photovoltaic materials, acting as an alternative to lead halide hybrid perovskites having similar optoelectronic properties. In the present work, we report the electronic and optical properties of chalcogenide perovskites AZrS$_3$ (A=Ca, Sr, Ba) by using the density functional theory (DFT) and many-body perturbation theory (MBPT viz. G$_0$W$_0$ and BSE). This study includes excitonic analysis for the aforementioned systems. The exciton binding energy (E$_\textrm{B}$) is found to be larger than that of the halide perovskites, as the ionic contribution to dielectric screening is negligible in the former. We also observe a more stable charge-separated polaronic state as compared to that of the bound exciton. Finally, on the basis of direct gap and absorption coefficient, the estimated spectroscopic limited maximum efficiency (SLME) of the solar cells is large and suggests the applicability of these perovskites in photovoltaics.

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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