Impact of Photogenerated Charge Carriers on the Stability of the 2D/3D Perovskite Interface

IF 7.2 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Zhaojie Zhang, Miu Tsuji, Xin Hu, Tomoyasu Mani, D. Venkataraman
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Abstract

An effective strategy to improve the performance and stability of perovskite solar cells is to deposit a 2D perovskite capping layer on the 3D perovskite. However, when exposed to light, small A-site cations in 3D perovskite exchange with the bulky cations in the 2D layer and degrade the 2D/3D interface. Therefore, to achieve long-term stability in perovskite solar cells, it is important to understand the nature of the photogenerated charge carriers that cause cation migrations at the 2D/3D interface. In this work, we fabricated 2D/3D perovskite stacks on glass, ITO, ITO/PTAA, ITO/PTAA/CuI, and ITO/SnO2. A combination of grazing incidence X-ray diffraction and steady-state and time-resolved photoluminescence studies reveals the link between the light-induced degradation and the photogenerated charge carrier dynamics. Upon illumination, the stability of the 2D layers follows this trend: ITO/PTAA/CuI ≈ ITO > ITO/PTAA > glass > ITO/SnO2 (from stable to unstable). This trend suggests that efficiently extracting holes from the 3D layer can improve the stability of the 2D layer. We also found that 2D/3D stacks degrade faster when illuminated from the 2D side instead of the 3D side. Our studies suggest that to achieve a stable 2D/3D interface, hole accumulation in the 3D layer should be avoided, and the exciton density in the 2D layer should be reduced.

Abstract Image

光生载流子对二维/三维钙钛矿界面稳定性的影响
提高钙钛矿太阳能电池性能和稳定性的有效策略是在三维钙钛矿上沉积二维钙钛矿封盖层。然而,当暴露在光线下时,3D钙钛矿中的小a位阳离子与2D层中的大阳离子交换,并降解2D/3D界面。因此,为了实现钙钛矿太阳能电池的长期稳定性,了解导致2D/3D界面阳离子迁移的光生电荷载流子的性质是很重要的。在这项工作中,我们在玻璃、ITO、ITO/PTAA、ITO/PTAA/CuI和ITO/SnO2上制备了2D/3D钙钛矿堆叠。结合掠入射x射线衍射和稳态和时间分辨光致发光研究,揭示了光诱导降解和光生载流子动力学之间的联系。光照后,二维层的稳定性遵循以下趋势:ITO/PTAA/CuI≈ITO >;ITO / PTAA比;玻璃比;ITO/SnO2(从稳定到不稳定)。这一趋势表明,有效地从三维层中提取孔洞可以提高二维层的稳定性。我们还发现,当从2D面而不是3D面照射时,2D/3D堆叠的退化速度更快。我们的研究表明,为了实现稳定的2D/3D界面,应避免3D层中的空穴积累,并降低2D层中的激子密度。
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来源期刊
Chemistry of Materials
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.
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