Photovoltaic Performance of FAPbI3 Perovskite Is Hampered by Intrinsic Quantum Confinement,ACS Energy Letters

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Photovoltaic Performance of FAPbI3 Perovskite Is Hampered by Intrinsic Quantum Confinement
ACS Energy Letters ( IF 19.3 ) Pub Date : 2023-05-10 , DOI: 10.1021/acsenergylett.3c00656
Karim A Elmestekawy ₁ , Benjamin M Gallant ₁ , Adam D Wright ₁ , Philippe Holzhey ₁ , Nakita K Noel ₁ , Michael B Johnston ₁ , Henry J Snaith ₁ , Laura M Herz _{1,

2}

Affiliation

Formamidinium lead trioiodide (FAPbI₃) is a promising perovskite for single-junction solar cells. However, FAPbI₃ is metastable at room temperature and can cause intrinsic quantum confinement effects apparent through a series of above-bandgap absorption peaks. Here, we explore three common solution-based film-fabrication methods, neat N,N-dimethylformamide (DMF)–dimethyl sulfoxide (DMSO) solvent, DMF-DMSO with methylammonium chloride, and a sequential deposition approach. The latter two offer enhanced nucleation and crystallization control and suppress such quantum confinement effects. We show that elimination of these absorption features yields increased power conversion efficiencies (PCEs) and short-circuit currents, suggesting that quantum confinement hinders charge extraction. A meta-analysis of literature reports, covering 244 articles and 825 photovoltaic devices incorporating FAPbI₃ films corroborates our findings, indicating that PCEs rarely exceed a 20% threshold when such absorption features are present. Accordingly, ensuring the absence of these absorption features should be the first assessment when designing fabrication approaches for high-efficiency FAPbI₃ solar cells.

中文翻译：

FAPbI3 钙钛矿的光伏性能受到本征量子限制的阻碍

甲脒三碘化铅 (FAPbI ₃ ) 是一种很有前途的用于单结太阳能电池的钙钛矿。然而，FAPbI ₃在室温下是亚稳态的，并且可以通过一系列带隙以上的吸收峰引起明显的固有量子限制效应。在这里，我们探讨了三种常见的基于溶液的薄膜制造方法，neat N , N-二甲基甲酰胺 (DMF)–二甲基亚砜 (DMSO) 溶剂、DMF-DMSO 和甲基氯化铵，以及顺序沉积方法。后两者提供增强的成核和结晶控制并抑制这种量子限制效应。我们表明，消除这些吸收特性会提高功率转换效率 (PCE) 和短路电流，这表明量子限制阻碍了电荷提取。文献报告的荟萃分析，涵盖 244 篇文章和 825 个包含 FAPbI _{3 的光伏器件}电影证实了我们的发现，表明当存在这种吸收特征时，PCE 很少超过 20% 的阈值。因此，确保不存在这些吸收特征应该是设计高效 FAPbI ₃太阳能电池制造方法时的首要评估。

更新日期：2023-05-10

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