Efficient and stable Ruddlesden-Popper layered tin-based perovskite solar cells enabled by ionic liquid-bulky spacers

Qiu, Jian; Lin, Yuexin; Ran, Xueqin; Wei, Qi; Gao, Xingyu; Xia, Yingdong; Müller‐Buschbaum, Peter; Chen, Yonghua

doi:10.1007/s11426-021-1075-7

Cited by 34 publications

(36 citation statements)

References 47 publications

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“…As depicted in Figure a., the EDAFa 2 interfacial layer interacts with a Sn-based perovskite structure. Moreover, besides, our previous work also proved that acetate in bulk and R–NH 3 + also protect the formamidine from volatilizing out of a perovskite crystal, which further confirmed the positive impact of carboxylate ions in perovskite fabrication …”

Section: Results and Discussionsupporting

confidence: 63%

“…Moreover, a broad peak at 3200–2250 and 1650–1500 cm –1 and a weak peak at 2200–2100 cm –1 were observed (Figure b), corresponding to the H···N stretching vibration, H···N bending vibration, and characteristic bending vibration in only primary NH 3 + , respectively. ,, However, the characteristic bending vibration of the NH 3 + was not observed in EDA, indicating the in situ formation of the EDAFa 2 interfacial layer on the interface. In addition, several studies have showed that the carboxylate ion has the strong chemical interaction with Sn-based perovskites and could create a thermodynamically stable chemical environment for Sn 2+ . , The strong coordination bond between EDAFa 2 (CO δ− ) and Sn 2+ also observed by FTIR due to the red-shift of vibration (CO) (Figures c and S3). As depicted in Figure a., the EDAFa 2 interfacial layer interacts with a Sn-based perovskite structure.…”

Section: Results and Discussionmentioning

confidence: 94%

“…In addition, several studies have showed that the carboxylate ion has the strong chemical interaction with Snbased perovskites and could create a thermodynamically stable chemical environment for Sn 2+ . 27,32 The strong coordination bond between EDAFa 2 (C O δ− ) and Sn 2+ also observed by FTIR due to the red-shift of vibration (CO) (Figures 2c and S3). As depicted in Figure 2a., the EDAFa 2 interfacial layer interacts with a Sn-based perovskite structure.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…However, even in nitrogen-filled gloveboxes, the oxidation from Sn 2+ to Sn 4+ is thermodynamically favored, resulting in undesired high p-doping carrier concentration associated with Sn vacancy defects in Sn-based perovskite films. ,, To date, substantial efforts have been extensively devoted to additive engineering to address the performance of Sn PSCs; for instance, using reductant additives, including pyrazine, hydrazine, Sn powder, Sn nanoparticles, and phenylhydrazine hydrochloride, has also been reported and shown to be a promising method. ,, Besides, for Pb and Sn-based PSC, substantial impacts of formate and formic acid have been found. − However, although these strategies can solve the stability problem to some extent, the film quality could be deteriorated by increasing the additive dosage. In addition, several bulky ammonium cations could only act as an interface passivator in Sn-based PSCs but not change the shallow bulk and interface chemical environment . Alternatively, interfacial engineering of Sn-based PSCs has recently been presented as a potential method for overcoming the stability issue of Sn-based perovskite films while also enhancing the photovoltaic performance of Sn-based PSCs. , Hence, it is critical to develop effective interfacial modification strategies for further improving the performance of Sn-based PSCs.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, several bulky ammonium cations could only act as an interface passivator in Sn-based PSCs but not change the shallow bulk and interface chemical environment. 27 Alternatively, interfacial engineering of Sn-based PSCs has recently been presented as a potential method for overcoming the stability issue of Sn-based perovskite films while also enhancing the photovoltaic performance of Sn-based PSCs. 28,29 Hence, it is critical to develop effective interfacial modification strategies for further improving the performance of Sn-based PSCs.…”

Section: ■ Introductionmentioning

confidence: 99%

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In Situ Interfacial Passivation of Sn-Based Perovskite Films with a Bi-functional Ionic Salt for Enhanced Photovoltaic Performance

Lin

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Environment-friendly Tin (Sn)-based perovskite solar cells (PSCs) have lately made significant development, showing tremendous promise in addressing the hazardous problems associated with Pb-based PSCs. However, even in N2 atmospheres, the thermodynamic stability of Sn-based perovskite films and long-term stability of Sn-based PSCs are demonstrated to be poor due to the presence of interfacial defect trap states. Here, we demonstrate the post-treatment of Sn-based perovskite films with ethylenediamine formate (EDAFa2) ion salt, serving as a bi-functional interface layer to in situ passivate the interfacial defect and improve the stability of Sn2+ by creating a thermodynamic chemical environment pathway. Moreover, the presence of EDAFa2 is shown to promote the interfacial energy level alignment, which is beneficial for the charge extraction at the interface. As a result, PSC devices with a bi-functional interface achieve a champion power conversion efficiency (PCE) as high as 9.40% and enhanced stability, retaining ∼95% of the original PCE stored in a N2 environment after ∼1960 h without encapsulation. This work highlights the significant role of an interfacial design in efficient and stable Sn-based PSCs.

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Section: Results and Discussionsupporting

confidence: 63%

Section: Results and Discussionmentioning

confidence: 94%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

In Situ Interfacial Passivation of Sn-Based Perovskite Films with a Bi-functional Ionic Salt for Enhanced Photovoltaic Performance

Lin

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Structural Tailoring the Phenylenediamine Isomers to Obtain 2D Dion–Jacobson Tin Perovskite Solar Cells with Record Efficiency

Yao,

Wu,

et al. 2023

Adv Funct Materials

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Abstract2D Dion–Jacobson (DJ) tin halide perovskite shows impressive stability by introducing diamine organic spacer. However, due to the dielectric confinement and uncontrollable crystallization process, 2D DJ perovskite usually exhibits large exciton binding energy and poor film quality, resulting in unfavorable charge dissociation, carrier transport and device performance. Here, the ortho‐, meta‐, and para‐isomers of phenylenediamine (PDA) are designed for 2D DJ tin halide perovskites. Theoretical simulation and experimental characterizations demonstrate that compared with p‐PDA and m‐PDA, o‐PDA shows larger dipole moment, which further reduces the exciton binding energy for the 2D perovskites. Besides, there is a strong hydrogen bond interaction between o‐PDA cation and inorganic octahedron, which not only improves the structural stability, but also induces larger aggregates in the precursor to form dense and uniform high‐quality films, and strengthens the antioxidant barrier. More interestingly, femtosecond transient absorption further proves that o‐PDA organic spacers can reduce unfavorable small n‐phases, resulting in sufficient and effective charge transfer between different n‐value. As a result, the 2D DJ (o‐PDA)FA3Sn4I13 solar cells achieve a record power conversion efficiency of 7.18%. The study furnishes an effective method to optimize the carrier transport and device performance by tailoring the chemical structure of organic spacers.

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A Revisit of Crystallization in Tin Halide Perovskite Thin Films: From Nucleation, Intermediate to Crystal Growth

Yin,

Yao,

Qiu

et al. 2024

Adv Funct Materials

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Perovskite solar cells (PSCs) are exuding unique charm in the third generation of thin film solar cell technology with high power conversion efficiency (PCE) and low production cost. Recently, the lead‐free tin halide perovskite solar cells (TPSCs) have drawn significant research interests due to the advantages of low toxicity, near‐ideal bandgap and high carrier mobility. However, the rapid crystallization and easy oxidation limits the film quality and final performance of the solar cells. Therefore, the deposition of high‐quality tin halide perovskite films is key to the advance of TPSCs. In this review, the classical theory of solution nucleation and crystal growth is reviewed and correlated to the practical deposition of tin perovskite film. The physicochemical properties of tin perovskite with those of lead counterpart and the differences in the crystallization process is carefully compared. On this basis, recent regulation strategies are systematically summarized in terms of the nucleation management, intermediate phase engineering and crystal growth regulation. In addition, the preparation of mixed tin‐lead (Sn‐Pb) PSCs toward high performance is also discussed, as well as the limiting factors for device performance and stability. Finally, the future challenges and prospects of the crystallization regulation are discussed toward more efficient and stable TPSCs.

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Efficient and stable Ruddlesden-Popper layered tin-based perovskite solar cells enabled by ionic liquid-bulky spacers

Cited by 34 publications

References 47 publications

In Situ Interfacial Passivation of Sn-Based Perovskite Films with a Bi-functional Ionic Salt for Enhanced Photovoltaic Performance

In Situ Interfacial Passivation of Sn-Based Perovskite Films with a Bi-functional Ionic Salt for Enhanced Photovoltaic Performance

Structural Tailoring the Phenylenediamine Isomers to Obtain 2D Dion–Jacobson Tin Perovskite Solar Cells with Record Efficiency

A Revisit of Crystallization in Tin Halide Perovskite Thin Films: From Nucleation, Intermediate to Crystal Growth

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