In Situ Formation of δ-FAPbI3 at the Perovskite/Carbon Interface for Enhanced Photovoltage of Printable Mesoscopic Perovskite Solar Cells

IF 7.1 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Chemistry of Materials Pub Date : 2022-01-10 DOI:10.1021/acs.chemmater.1c03505

Xiayan Chen, Yongkang Xia, Ziwei Zheng, Xuan Xiao, Chenxi Ling, Minghao Xia, Yue Hu, Anyi Mei, Rongrong Cheacharoen, Yaoguang Rong*, Hongwei Han*

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引用次数: 13

Abstract

Formamidinium lead triiodide (FAPbI₃) perovskite has attracted intensive research attention due to its ideal band gap and low defect density for photovoltaic applications. Particularly, the existence of non-photoactive δ-phase FAPbI₃ has been considered detrimental to regular-structured perovskite solar cells (PSCs). Here, in hole-conductor-free triple-mesoscopic PSCs, we observe that α-phase FAPbI₃ transforms to δ-phase FAPbI₃ at the perovskite/carbon interface and in situ forms an α/δ-phase junction when the as-fabricated cells are exposed to humid atmosphere. The α/δ-phase junction shows a favorable band alignment and significantly suppresses the charge recombination at the interface. By controlling the relative humidity of the atmosphere, we fabricate FAPbI₃-based cells that deliver a champion efficiency of 17.11% with an enhanced open-circuit voltage (V_OC) of 1020 mV. This work demonstrates the potential of δ-phase FAPbI₃ for benefiting the device performance of PSCs and proposes the concept of constructing perovskite-based junctions at the interface between a perovskite-absorbing layer and charge-transporting layers for enhancing the V_OC of PSCs.

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钙钛矿/碳界面上δ-FAPbI3的原位形成增强了可印刷介观钙钛矿太阳能电池的光电压

三碘化甲脒铅(FAPbI3)钙钛矿因其理想的带隙和低缺陷密度而受到广泛的研究关注。特别是，非光活性δ相FAPbI3的存在被认为对规则结构的钙钛矿太阳能电池(PSCs)有害。在无空穴导体的三介孔PSCs中，我们观察到α-相FAPbI3在钙钛矿/碳界面转变为δ-相FAPbI3，并在原位形成α/δ相结。α/δ相结表现出良好的能带对准，显著抑制了界面处的电荷复合。通过控制大气的相对湿度，我们制造了基于fapbi3的电池，其开路电压(VOC)提高到1020 mV，效率为17.11%。这项工作证明了δ相FAPbI3有利于PSCs器件性能的潜力，并提出了在钙钛矿吸收层和电荷传输层之间的界面上构建钙钛矿基结的概念，以提高PSCs的VOC。

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来源期刊

Chemistry of Materials 工程技术-材料科学：综合

CiteScore

14.10

自引率

5.80%

发文量

929

审稿时长

1.5 months

期刊介绍： The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.