How Stable Is the 2D/3D Interface of Metal Halide Perovskite under Light and Heat?

Chakkamalayath, Jishnudas; Hiott, Nathaniel; Kamat, Prashant V.

doi:10.1021/acsenergylett.2c02408

Cited by 30 publications

(42 citation statements)

References 23 publications

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“…There is interest in raising the standard to 85°C ISOS-L-3 (MPP tracking at 85°C and 50% RH). However, the reactivity of ammonium ligands with 3D perovskites may lead to further penetration into the bulk perovskite film ( 28 , 31 , 32 ) and may contribute to deterioration in device performance under these very demanding stress conditions ( 27 , 28 , 31 – 33 ). Thus, we explored noninvasive surface-passivating ligands, but we did note that in prior studies, these have yet to achieve the remarkable benefits of the 2D/3D strategy.…”

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confidence: 99%

“…There is a diversity of findings in reports on the stability of 2D overlayers under stress. Some studies have indicated limited stability of the 2D/3D interface under thermal stress (27)(28)(29). Progress has been made, with a recent study demonstrating 500-hour operating stability under conditions of 65°C, 50% relative humidity (RH), and maximum power point (MPP) tracking [International Summit on Organic Photovoltaic Stability (ISOS)-L-3-65°C], enhanced by the incorporation of 3-fluorophenethylammonium (3FPEA) intercalation (23).…”

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confidence: 99%

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Engineering ligand reactivity enables high-temperature operation of stable perovskite solar cells

Park

Wei

et al. 2023

Science

131

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Perovskite solar cells (PSCs) consisting of interfacial two- and three-dimensional heterostructures that incorporate ammonium ligand intercalation have enabled rapid progress toward the goal of uniting performance with stability. However, as the field continues to seek ever-higher durability, additional tools that avoid progressive ligand intercalation are needed to minimize degradation at high temperatures. We used ammonium ligands that are nonreactive with the bulk of perovskites and investigated a library that varies ligand molecular structure systematically. We found that fluorinated aniliniums offer interfacial passivation and simultaneously minimize reactivity with perovskites. Using this approach, we report a certified quasi–steady-state power-conversion efficiency of 24.09% for inverted-structure PSCs. In an encapsulated device operating at 85°C and 50% relative humidity, we document a 1560-hour T 85 at maximum power point under 1-sun illumination.

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confidence: 99%

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confidence: 99%

Engineering ligand reactivity enables high-temperature operation of stable perovskite solar cells

Park

Wei

et al. 2023

Science

131

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“…33 Interestingly, the S−S interaction within MTEA 2 PbI 4 provides no substantial advantage in terms of stability despite showing enhanced electronic properties, as recently proposed, 4 in line with previous reports. 34 Dispersion interactions, such as for PEA 2 PbI 4 , show a weak coupling of the organic framework, which may cause observed instabilities under elevated temperatures and permit percolation of bulky PEA cations into the 3D layer at the 2D/3D MHP interface 35,36 while the introduction of the halogen in aromatic cation such as I-PMA does not provide a substantial stabilization against PEA (see Table 1). We further emphasize that PEA 2 PbI 4 represents a lower limit of π−π interactions due to limited π-orbital overlap, which may be enhanced by tuning the aromatic cations.…”

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confidence: 99%

Intermolecular Interactions of A-Site Cations Modulate Stability of 2D Metal Halide Perovskites

et al. 2022

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Controlling the chemical properties of A-site cations in 2D metal halide perovskites (MHPs) and in 2D/3D assemblies is key to stable and efficient optoelectronic devices. Here, we rationalize the chemical interactions of different classes of organic cations in 2D MHPs, which are responsible for material stability in 2D and 2D/3D heterojunctions. Our results emphasize potential enhancement in stability by hydrogen bonding within the organic framework, showing substantially stronger intermolecular interaction compared to aromatic π−π stacking and aliphatic chains. This observation may lead to the design of organic cations with enhanced intermolecular interactions for increased stability in MHP-based devices.

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“…Note that an RP‐3D interface is reported to be kinetically unstable under thermal or light stresses, [ 36,37 ] with an activation energy as low as 0.38 eV. [ 38 ] Based on the above analysis, we believe the presented ACI phase can be considered as a final stable stage of an RP‐3D interface.…”

Section: Resultsmentioning

confidence: 93%

Passivating Perovskites in Air Via an Alternating Cation Interlayer Phase Formed by Benzylamine Vapor Fumigation

Qian

Cao

et al. 2023

Adv Funct Materials

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2D perovskites are widely employed to improve efficiency and stability of perovskite solar cells (PSCs), but the processes are rarely accomplished in air due to the difficulty of controlling the formation processes. An ultra-thin 2D capping layer with an alternating cation interlayer (ACI) structure is in situ formed by fumigating 3D perovskites with benzylamine vapor. The whole process is finished in air within 10 s regardless of the humidity, after which both defects and tensile strain are reduced and the interfacial energy band gets benignly aligned to a type-I heterojunction, avoiding direct charge recombination at the interface. Theoretical analysis reveals that the ACI phase is thermodynamically more stable than an analogous Ruddlesden-Popper phase. The strategy can passivate various perovskites, including methylammonium (or multi-cation) lead (or lead/tin mixed) halide perovskites, prepared via either vapor or solution approaches, increasing the absolute power conversion efficiency by up to 2.5%. It can uniformly passivate PSCs without area limitation, and provide a repeatable methodology for passivating perovskites.

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How Stable Is the 2D/3D Interface of Metal Halide Perovskite under Light and Heat?

Cited by 30 publications

References 23 publications

Engineering ligand reactivity enables high-temperature operation of stable perovskite solar cells

Engineering ligand reactivity enables high-temperature operation of stable perovskite solar cells

Intermolecular Interactions of A-Site Cations Modulate Stability of 2D Metal Halide Perovskites

Passivating Perovskites in Air Via an Alternating Cation Interlayer Phase Formed by Benzylamine Vapor Fumigation

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