arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.12490cond-mat.mtrl-scicond-mat.other
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铜掺杂Cs2AgInCl6双光子晶体的结构和光电行为:DFT研究

Structural and Optoelectronic Behaviour of Copper Doped Cs2AgInCl6 Double Perovskite: A DFT Investigation

I. B. Ogunniranye, T. Atsue, O. E. Oyewande

摘要:

最近,直接带隙双钙钛矿在光伏研究界中变得越来越流行,这是由于它们有可能解决铅(Pb)毒性和卤化铅(简单)钙钛矿中固有的结构不稳定性的问题。在本研究中,In-Ag基直接带隙双钙钛矿Cs2 AgInCl 6(CAIC),处理过渡金属掺杂,以改善材料的光电性能。采用密度泛函理论(DFT)和虚晶近似(VCA)的从头计算方法,对Cu掺杂的CAIC Cs2 Ag(1-x)CuxInCl 6的结构和光电性质进行了研究.计算结果表明,随着Cu含量的增加,Cs2 Ag(1-x)CuxInCl 6的最佳晶格常数和直接带隙分别呈线性和二次函数减小,而体弹性模量则呈二次函数增大.光吸收系数,光学电导率和其他光学参数的利益也计算,表明增强的吸收和导电性较高的铜含量。基于我们的研究结果,过渡金属(Cu)掺杂是处理双钙钛矿的一种可行方法-通过调整其光电性能,适用于广泛的光电子器件,太阳能电池和光电子器件。

英文摘要:

Recently, direct bandgap double perovskites are becoming more popular among photovoltaic research community owing to their potential to address issues of lead (Pb) toxicity and structural instability inherent in lead halide (simple) perovskites. In this study, In-Ag based direct bandgap double perovskite, Cs2AgInCl6 (CAIC), is treated with transition metal doping to improve the optoelectronic properties of the material. Investigations of structural and optoelectronic properties of Cu-doped CAIC, Cs2Ag(1-x)CuxInCl6, are done using ab-initio calculations with density functional theory (DFT) and virtual crystal approximation (VCA). Our calculations show that with increasing Cu content, the optimized lattice parameter and direct bandgap of Cs2Ag(1-x)CuxInCl6 decrease following linear and quadratic functions respectively, while the bulk modulus increases following a quadratic function. The photo-absorption coefficient, optical conductivity and other optical parameters of interest are also computed, indicating enhanced absorption and conductivity for higher Cu contents. Based on our results, transition metal (Cu) doping is a viable means of treating double perovskites - by tuning their optoelectronic properties suitable for an extensive range of photovoltaics, solar cells and optoelectronics.

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