arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.03545cond-mat.mtrl-sci
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基于BiFeO3的无机光电池:自发极化、晶格匹配、光偏振及其与光伏性能的关系

Inorganic photovoltaic cells based on BiFeO3: spontaneous polarization, lattice matching, light polarization and their relationship to photovoltaic performance

Chao He, Guocai Liu, Huiyan Zhao, Kun Zhao, Zuju Ma, Xingtao An

摘要:

无机铁电钙钛矿氧化物比混合钙钛矿更稳定。然而,他们的太阳能收获效率并不那么好。在此,通过构建一系列BiFeO 3基太阳能电池,研究了自发极化、BiFeO 3与电极界面的终止离子种类以及偏振光辐照对光伏性能的影响。本工作是在密度泛函理论和非平衡格林函数理论的框架下,在内建电场或有限偏压下进行的。结果表明:1.光电流仅在合适的电子带隙下才较大,而不是在较大的自发极化下较大; 2.在Bi离子终止的界面上的光电流比Fe离子或O离子终止的界面上的光电流大; 3.如果单色光的偏振方向垂直于自发偏振方向,则光电流可以大大增强。这一结果加深了对BiFeO_3基太阳电池某些实验结果的理解。

英文摘要:

Inorganic ferroelectric perovskite oxides are more stable than hybrid perovskites. However, their solar energy harvest efficiency is not so good. Here, by constructing a series of BiFeO3 based devices (solar cells), we investigated three factors that influence the photovoltaic performance, including spontaneous polarization, terminated ions species in the interface between BiFeO3 and the electrode, and polarized light irradiation. This work was carried out in the framework of density functional theory combined with non-equilibrium Green's function theory under built in electric field or finite bias. The results showed that 1. the photocurrent is larger only under a suitable electronic band gap rather than larger spontaneous polarization; 2. the photocurrent reaches the largest in Bi ions terminated interface than in the case of Fe ion or O ion with SrTiO3 electrode; 3. the photocurrent could be largely enhanced if the polarized direction of the monochromatic light is perpendicular to the spontaneous polarization direction. The results would deepen the understanding of some experimental results of BiFeO3 based solar cells.

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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