Selenophene-Based 2D Ruddlesden-Popper Perovskite Solar Cells with an Efficiency Exceeding 19%

Fu, Qiang; Chen, Mingqian; Li, Qiaohui; Liu, Hang; Wang, Rui; Liu, Yongsheng

doi:10.1021/jacs.3c08604

Cited by 25 publications

(11 citation statements)

References 53 publications

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“…Using recently published measurements of E b and dielectric constants by the author and colleagues, it is now possible to directly search for correlations between E b and dielectric mismatch directly within the experimental data; however, no clear relationship is observed (Figure a). Instead, a weak, negative trend is observed, opposite the positive trend widely espoused in the literature. − In Figure S1, possible correlations between E b and dielectric mismatch are searched for in a more sophisticated manner; however, no correlations are found. By contrast, E b as a function of the bulk dielectric constant ε bulk exhibits the typical dependence of E b ∝ 1/ε bulk 2 (Figure b)…”

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confidence: 90%

Is Dielectric Mismatch Actually Important in 2D Perovskites?

Hansen

2024

Nano Lett.

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Understanding and controlling exciton properties are important for the design of 2D semiconductors, such as monolayer transition metal dichalcogenides (TMDCs) and 2D halide perovskites (HPs). This paper demonstrates that the widespread strategy used for the exciton engineering of 2D HPs, based on dielectric mismatch, is flawed since dielectric mismatch has very little correlation with exciton properties. For monolayer TMDCs, however, the dielectric mismatch is shown to be more important.

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confidence: 90%

Is Dielectric Mismatch Actually Important in 2D Perovskites?

Hansen

2024

Nano Lett.

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“…The excellent optoelectronic properties of three-dimensional (3D) perovskites enable their usage for constructing high-efficiency perovskite solar cells (PSCs). − However, various types of defects at the surface and grain boundaries of perovskite films often result in poor moisture, photo, and thermal stability of derived PSCs, hindering their commercialization. − Therefore, numerous passivators have been developed to passivate defects for obtaining high-quality perovskite film. , However, the currently used passivators are mainly based on ionic, Lewis acid/base, and low-dimensional perovskites (LDPs) passivators. − LDPs, including zero-dimensional (0D), one-dimensional (1D), and two-dimensional (2D) perovskites, are characterized by larger A-site organic cations. , Compared with other passivators, LDPs can passivate deep-level defects at the surface and grain boundaries and form heterojunctions with 3D perovskites to effectively facilitate charge extraction and transfer. , In addition, the LDPs can also improve the energy-level alignment through interfacial modification, eliminate hysteresis, and enhance long-term stability. , …”

Section: Introductionmentioning

confidence: 99%

Dimensional Regulation from 1D/3D to 2D/3D of Perovskite Interfaces for Stable Inverted Perovskite Solar Cells

Wang,

Bi,

Yang

et al. 2024

J. Am. Chem. Soc.

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Constructing low-dimensional/three-dimensional (LD/3D) perovskite solar cells can improve efficiency and stability. However, the design and selection of LD perovskite capping materials are incredibly scarce for inverted perovskite solar cells (PSCs) because LD perovskite capping layers often favor hole extraction and impede electron extraction. Here, we develop a facile and effective strategy to modify the perovskite surface by passivating the surface defects and modulating surface electrical properties by incorporating morpholine hydriodide (MORI) and thiomorpholine hydriodide (SMORI) on the perovskite surface. Compared with the PI treatment that we previously developed, the onedimensional (1D) perovskite capping layer derived from PI is transformed into a two-dimensional (2D) perovskite capping layer (with MORI or SMORI), achieving dimension regulation. It is shown that the 2D SMORI perovskite capping layer induces more robust surface passivation and stronger n−N homotype 2D/3D heterojunctions, achieving a p−i−n inverted solar cell with an efficiency of 24.55%, which retains 87.6% of its initial efficiency after 1500 h of operation at the maximum power point (MPP). Furthermore, 5 × 5 cm 2 perovskite mini-modules are presented, achieving an active-area efficiency of 22.28%. In addition, the quantum well structure in the 2D perovskite capping layer increases the moisture resistance, suppresses ion migration, and improves PSCs' structural and environmental stability.

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“…[12,13] Additionally, organic spacers based on primary ammoniums have been extensively studied in layered 2D PSCs. [13][14][15][16][17][18][19] In contrast to primary ammonium, secondary ammonium, which has a reduced amount of active hydrogen on the amino group, could diminish the hydrogen bonding between the ammonium in the perovskite active layer and the water in the ambient environment. This effect could enhance the stability of perovskite films and devices.…”

Section: Introductionmentioning

confidence: 99%

Modulating the Dipole Moment of Secondary Ammonium Spacers for Efficient 2D Ruddlesden‐Popper Perovskite Solar Cells

Zhang,

Wang,

Yang

et al. 2024

Angew Chem Int Ed

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Layered two‐dimensional (2D) perovskites are emerging as promising optoelectronic materials owing to their excellent environmental stability. Regulating the dipole moment of organic spacers has the potential to reduce the exciton binding energy (Eb) of 2D perovskites and improve their photovoltaic performance. Here, we developed two azetidine‐based secondary ammonium spacers with different electron‐withdrawing groups, namely 3‐hydroxyazatidine (3‐OHAz) and 3,3‐difluoroazetidine (3,3‐DFAz) spacers, for 2D Ruddlesden‐Popper (RP) perovskites. It was found that the large dipole moment of the fluorinated dipole spacer could effectively enhance the interaction between organic spacers and inorganic layers, leading to improved charge dissociation in 2D RP perovskite. In contrast to 3‐OHAz spacer, the 2D perovskite using 3,3‐DFAz as spacer also shows improved film quality, optimized energy level alignment, and reduced exciton binding energy. As a result, the 2D perovskite (n = 4) device based on 3,3‐DFAz yields an outstanding efficiency of 19.28%, surpassing that of the 3‐OHAz‐Pb device (PCE = 11.35%). The efficiency was further improved to 19.85% when using mixed A‐site cation of MA0.95FA0.5. This work provides an effective strategy for modulating the energy level alignment and reducing the Eb by regulating the dipole moment of organic spacers, ultimately enabling the development of high‐performance 2D perovskite solar cells.

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Selenophene-Based 2D Ruddlesden-Popper Perovskite Solar Cells with an Efficiency Exceeding 19%

Cited by 25 publications

References 53 publications

Is Dielectric Mismatch Actually Important in 2D Perovskites?

Is Dielectric Mismatch Actually Important in 2D Perovskites?

Dimensional Regulation from 1D/3D to 2D/3D of Perovskite Interfaces for Stable Inverted Perovskite Solar Cells

Modulating the Dipole Moment of Secondary Ammonium Spacers for Efficient 2D Ruddlesden‐Popper Perovskite Solar Cells

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