Highly Thermostable and Efficient Formamidinium‐Based Low‐Dimensional Perovskite Solar Cells

Cheng, Lei; Liu, Zhou; Li, Shunde; Zhai, Yufeng; Wang, Xiao; Qiao, Zhiqiang; Xu, Qiaofei; Zhu, Zhiyuan; Chen, Gang

doi:10.1002/ange.202006970

Cited by 16 publications

(15 citation statements)

References 62 publications

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“…[ 1 ] So far, the aliphatic diammonium spacers, such as 1,4‐butanediamine (BDA) and 1,3‐propanediamine (PDA), have been studied in 2D DJ perovskite devices with promising photovoltaic performance. [ 20–22 ] However, the electrically insulating aliphatic diammonium spacers could block efficient charge transport due to their low dielectric constant. [ 23 ] In comparison with the aliphatic spacers, the aromatic spacers typically exhibit a larger dielectric constant and better conductivity due to the delocalized π‐electrons along the molecular backbone, which could weaken the dielectric confinement effect by reducing dielectric mismatch between corner‐sharing inorganic slabs and adjacent organic spacer layer.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient and Stable Dion−Jacobson Perovskite Solar Cells Enabled by Extended π‐Conjugation of Organic Spacer

et al. 2021

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in dramatically improved environmental and structural stability. [2,3] However, the exciton binding energy of layered phases in 2D perovskites could be as high as 300 meV although this value could be reduced with the increased thickness of inorganic layer, resulting in relatively inferior photovoltaic performance compared to 3D perovskite solar cells (PSCs). [13] Thus, it is urgent to develop more efficient organic spacers as well as device engineering to obtain both highly efficient and stable 2D PSCs for future industry application.Ruddlesden-Popper (RP) and Dion-Jacobson (DJ) structures are two main archetypes of layered 2D perovskites to date. [14][15][16][17][18][19] The general formula of a 2D RP and DJ perovskite is (L′) 2 A n−1 M n X 3n+1 and (L″)A n−1 M n X 3n+1 , where L′ and A are monovalent cations, L″ is a divalent organic cation, M is a divalent metal cation, X is a halide ion, and n is the number of corner-sharing [MX 6 ] 4− octahedral slabs. [5] Typically, a van der Waals gap exist in organic spacers between adjacent inorganic [MI 6 ] 4octahedron slabs in 2D RP perovskites. [1] 2D RP perovskites have been shown enhanced stability, while the weak interlayer interactions in 2D RP perovskites with obvious van der Waals gaps cannot sufficiently stabilize their layered structure. In contrast, charge transport and stability could be enhanced in 2D DJ perovskites, where the neighboring inorganic slabs were bridged by diammonium spacers, resulting in shortened interslab distance and eliminated van der Waals gap. [1] So far, the aliphatic diammonium spacers, such as 1,4-butanediamine (BDA) and 1,3-propanediamine (PDA), have been studied in 2D DJ perovskite devices with promising photovoltaic performance. [20][21][22] However, the electrically insulating aliphatic diammonium spacers could block efficient charge transport due to their low dielectric constant. [23] In comparison with the aliphatic spacers, the aromatic spacers typically exhibit a larger dielectric constant and better conductivity due to the delocalized π-electrons along the molecular backbone, which could weaken the dielectric confinement effect by reducing dielectric mismatch between corner-sharing inorganic slabs and adjacent organic spacer layer. [23][24][25] Recently, several aromatic diammonium cations such as pyridinium-based aromatic spacers (3AMP, 4AMP), phenyl-based aromatic spacer (PDMA) and thiophene-based aromatic spacer (ThDMA) have been developed as organic spacers in 2D DJ PSCs to enhance the device performance. [23,[26][27][28][29][30] These single aromatic ringbased bulky spacers used so far still cannot directly contribute 2D Dion-Jacobson (DJ) perovskites have become an emerging photovoltaic material with excellent structure and environmental stability due to their lacking van der Waals gaps relative to 2D Ruddlesden-Popper perovskites. Here, a fused-thiophene-based spacer, namely TTDMAI, is successfully developed for 2D DJ perovskite solar cells. It is found that the DJ perovskite using TTDMA spacer with extended π-conjuga...

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Section: Introductionmentioning

confidence: 99%

Highly Efficient and Stable Dion−Jacobson Perovskite Solar Cells Enabled by Extended π‐Conjugation of Organic Spacer

et al. 2021

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“…The layer‐number controls the properties of the 2D perovskites and corresponding HPSCs. The bandgap and exciton binding energy, for instance, decrease as the layer‐number increases, but the dielectric constant goes up 28,117 . Cheng et al 117 probed the relation between the properties and layer‐number of (PDA)(FA) n −1 Pb n I 3 n +1 ( n = 2, 3, and 4) 2D perovskite materials and the SCs (Figure 4A).…”

Section: Perovskite Engineeringmentioning

confidence: 99%

Section: Perovskite Engineeringmentioning

confidence: 99%

“…The bandgap and exciton binding energy, for instance, decrease as the layer-number increases, but the dielectric constant goes up. 28,117 Cheng et al 117 probed the relation between the properties and layer-number of (PDA)(FA) nÀ1 Pb n I 3n+1 (n = 2, 3, and 4) 2D perovskite materials and the SCs (Figure 4A). The optical properties strongly depend on the layer-number of (PDA)(FA) nÀ1 Pb n I 3n+1 2D perovskites.…”

Section: D Type Halide Perovskitesmentioning

confidence: 99%

Section: Double Type Halide Perovskitesmentioning

confidence: 99%

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Strategies for high‐performance perovskite solar cells from materials, film engineering to carrier dynamics and photon management

Chen

et al. 2022

InfoMat

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In recent years, halide perovskite solar cells (HPSCs) have attracted a great attention due to their superior photoelectric performance and the low‐cost of processing their quality films. In order to commercialize HPSCs, the researchers are focusing on developing high‐performance HPSCs. Many strategies have been reported to increase the power conversion efficiency and the long‐term stability of HPSCs over the past decade. Herein, we review the latest efforts and the chemical‐physical principles for preparing high‐efficiency and long‐term stability HPSCs in particular, concentrating on the perovskite materials, technologies for perovskite films, charge transport materials and ferroelectric effect to reduce the carrier loss, and photon management via plasmonic and upconversion effects. Finally, the key issues for future researches of HPSCs are also discussed with regard to the requirements in practical application.

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2D Dion–Jacobson CsPbI₃ with Enhanced Interlayer Coupling for Stable and Efficient Photovoltaics

Lei

Peng

Wang

et al. 2022

Adv Materials Inter

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Inorganic 2D layered CsPbI3 is awaiting to overcome the phase instability of traditional 3D components. However, the most reported Ruddlesden–Popper (RP) phase 2D CsPbI3 leads to larger interlayer distance and weaker interlayer coupling since the existence of the van der Waals gap, which deteriorates the performance of the device and makes the improvement of stability unsatisfactory. Herein, this work resorts ethylenediamine cations (EDA2+) to construct a series of Dion–Jacobson (DJ) phase 2D CsPbI3 as (EDA)Csn−1PbnI3n+1 with van der Waals gap eliminated. Combining simulation calculations and experiments, it is found that the (EDA)Csn−1PbnI3n+1 has enhanced intermolecular forces to overcome the problem of insufficient crystallization power caused by large steric hindrance in the film assembly process compared to phenethylammonium‐based RP phase analogues. In addition, profit from the reduced interlayer distance and stronger coupling, the rigidity of the structure is increased, and the annoying non‐radiative recombination caused by structural fluctuations is alleviated. As a result, the 2D layered DJ phase CsPbI3‐based solar cells deliver eminent performance than RP phase analogues, especially the 2D (EDA)(Cs)4Pb5I16 (n = 5) device exhibits a record PCE of 10.43% in this work, and significantly enhanced stability.

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Highly Thermostable and Efficient Formamidinium‐Based Low‐Dimensional Perovskite Solar Cells

Cited by 16 publications

References 62 publications

Highly Efficient and Stable Dion−Jacobson Perovskite Solar Cells Enabled by Extended π‐Conjugation of Organic Spacer

Highly Efficient and Stable Dion−Jacobson Perovskite Solar Cells Enabled by Extended π‐Conjugation of Organic Spacer

Strategies for high‐performance perovskite solar cells from materials, film engineering to carrier dynamics and photon management

2D Dion–Jacobson CsPbI₃ with Enhanced Interlayer Coupling for Stable and Efficient Photovoltaics

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Highly Thermostable and Efficient Formamidinium‐Based Low‐Dimensional Perovskite Solar Cells

Cited by 16 publications

References 62 publications

Highly Efficient and Stable Dion−Jacobson Perovskite Solar Cells Enabled by Extended π‐Conjugation of Organic Spacer

Highly Efficient and Stable Dion−Jacobson Perovskite Solar Cells Enabled by Extended π‐Conjugation of Organic Spacer

Strategies for high‐performance perovskite solar cells from materials, film engineering to carrier dynamics and photon management

2D Dion–Jacobson CsPbI3 with Enhanced Interlayer Coupling for Stable and Efficient Photovoltaics

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2D Dion–Jacobson CsPbI₃ with Enhanced Interlayer Coupling for Stable and Efficient Photovoltaics