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首页> 外文期刊>CERAMICS INTERNATIONAL >Reducing Pb concentration in alpha-CsPbI3 based perovskite solar cell materials via alkaline-earth metal doping: A DFT computational study
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Reducing Pb concentration in alpha-CsPbI3 based perovskite solar cell materials via alkaline-earth metal doping: A DFT computational study

机译:通过碱土金属掺杂降低基于α-CSPBI3的PEROVSKITE太阳能电池材料的PB浓度:DFT计算研究

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摘要

Full inorganic perovskite solar cell materials have shown significantly improved performance in recent years. To reduce their reliance on Pb, alkaline-earth metal ions (Ba, Sr, Ca, and Mg) have been employed for the exchange of Pb in alpha-CsPbI3. In this study, density functional theory calculations were used to study the structures, band structures, and optical absorption properties of these alkaline-earth-metal doped alpha-CsPbI3 materials with CASTEP (2017) and Dmol(3) (2017). The calculation also investigated the effect of spin-orbit coupling. Alkaline earth metal doping can enlarge the band gap of a-CsPbI3 and convert a-CsPbI3 from a direct gap semiconductor to an indirect gap semiconductor. After alkaline-earth metal doping, the sun-light absorption increased. Among all the alkaline-earth metals studied here, Mg-doped alpha-CsPbI3 showed the most improved indirect gap band structure, ideal band gap (compared to a-CsPbI3), and sun-light absorption.
机译:近年来,全无机钙钛矿太阳能电池材料表现出显着提高的性能。 为了降低对Pb的依赖,已经使用碱土金属离子(Ba,Sr,Ca和Mg)用于在α-cspbi3中交换Pb。 在该研究中,使用密度函数理论计算来研究这些碱土金属掺杂α-CSPBI3材料的结构,带状和光学吸收性能与Castep(2017)和DMOL(3)(2017)。 计算还研究了旋转轨道耦合的影响。 碱土金属掺杂可以扩大A-CSPBI3的带隙,并将A-CSPBI3从直接间隙半导体转换为间接间隙半导体。 碱土金属掺杂后,太阳光吸收增加。 在这里研究的所有碱土金属中,MG掺杂的α-CSPBI3显示出最改善的间接间隙带结构,理想的带隙(与A-CSPBI3相比)和太阳光吸收。

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