Reactive Inhibition Strategy for Triple‐cation Mixed‐halide Perovskite Ink with Prolonged Shelf‐life

Li, Zongcai; Xing, Zhi; Peng, Haibin; Li, Dengxue; Huang, Lu; Hu, Xiaotian; Hu, Ting; Chen, Yiwang

doi:10.1002/aenm.202200650

Cited by 18 publications

(27 citation statements)

References 43 publications

(60 reference statements)

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“…On the contrary, there was no peak that represents α-FAPbI 3 detected in pure MP intermediate phase films (sample 1), but the solvent phase which represents the intermediate phases of perovskite that contain DMSO and DMF and δ-FAPbI 3 was detected. 10 This proved that MP solutions are only composed of isolated monomers. The isolated monomers easily transform into a wide band gap δ-FAPbI 3 under ambient conditions because the large size of FA + induces lattice distortion.…”

Section: Ma Hx +mentioning

confidence: 85%

“…If MA was not consumed, the formed MA could react with HX again to form MAX in the solution. But in MP solution, FA + could constantly consume the produced MA to form MFA + and DMFA + (eq ), which leads to the continuous deprotonation reaction of MAX. , MAX ⇋ MA + HX FA + → MA normalM FA + → MA DM FA + …”

Section: Resultsmentioning

confidence: 99%

“…But in MP solution, FA + could constantly consume the produced MA to form MFA + and DMFA + (eq 2), which leads to the continuous deprotonation reaction of MAX. 10,27…”

Section: Characterization Of Perovskite Precursor Solutionsmentioning

confidence: 99%

“…The generated MA molecule immediately condensates with FAI to form byproducts, N -methyl FAI (MFAI) and N , N ′-dimethyl FAI (DMFAI), which results in the formation of the impurity phase in the perovskite film. Meanwhile, the continuous consumption and reaction of MA further aggravate the irreversible degradation of perovskite precursor solution. − To improve the stability of precursor solution, researchers have proposed various relevant stability strategies to restrict the deprotonation of MA + , like the addition of triethyl borate and phenylboric acid (PBA) as an electron-withdrawing stabilizer, benzylhydrazine hydrochloride as a reductant, and 3-hydrazinobenzoic acid (3-HBA) and diethyl (hydroxymethyl) phosphonate (DHP) as hybrid stabilizers. In addition, Pang and co-workers had developed a method that combined room temperature aging and vacuum treatment in the annealing process of perovskite layers to eliminate the side reactions .…”

Section: Introductionmentioning

confidence: 99%

“…10.1021/acsami.2c16242. TEM images of MPs and MCs solutions,1 H NMR results of MP and MC solutions for aging 1 day and 3 weeks, XRD of intermediate phase films with MCs after continuous aging for 3 weeks, XRD results for the final phases made by using MP and MC solutions for aging 1 day, statistical analysis of grain size, XRD of the finalphase film after aging under different conditions, SCLC results, statistics of the photovoltaic parameters, EQE spectra, long-term operational stability under ∼1 sun illumination, and thermal stability measurements (Figures S1−S12); the calculated results of V TFL , μ e , and N trap with dark I−V curves, statistical photovoltaic parameters, and the photovoltaic parameters by forward scan and reverse scan (Tables S1−S3) (PDF)…”

mentioning

confidence: 99%

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Method to Inhibit Perovskite Solution Aging: Induced by Perovskite Microcrystals

Fei

et al. 2022

ACS Appl. Mater. Interfaces

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The main feature of perovskite solar cells (PSCs) is that the perovskite layer can be fabricated by the solution method, while the long-time stability of the precursor solution is critical. During the fabrication of formamidinium (FA)-based PSCs, the introduction of methylammonium cations (MA+) in the precursor solution can accelerate the crystallization process of the perovskite layer, stabilize the perovskite structure, and passivate defects. However, MA+ is easy to deprotonate to generate MA molecules, and it then condensates with formamidinium iodide (FAI) to form adverse byproducts. Herein, perovskite microcrystals (MCs) for preparing perovskite precursor solution were investigated in details, which can improve the long-term stability of the precursor solution and the perovskite film. We found that FA+ in MC solution was confined in the three-dimensional scaffold, preventing it from reacting with MA+. Meanwhile, MCs can effectively promote nucleation to form large grains in perovskite films. The photoelectric conversion efficiency (PCE) of the device with 3 week-aged MC solution remains at 90% and is only reduced by 10% after 160 h of continuous operation, which far exceeds the performance of the PCE of those based on mixed monomer powder (MP) solution. Therefore, perovskite MCs, an effective reactive inhibitor to improve the stability of perovskite precursor solutions, are of great significance for large-scale commercial fabrication.

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Section: Ma Hx +mentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

“…But in MP solution, FA + could constantly consume the produced MA to form MFA + and DMFA + (eq 2), which leads to the continuous deprotonation reaction of MAX. 10,27…”

Section: Characterization Of Perovskite Precursor Solutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Method to Inhibit Perovskite Solution Aging: Induced by Perovskite Microcrystals

Fei

et al. 2022

ACS Appl. Mater. Interfaces

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Light‐Triggered Sustainable Defect‐Passivation for Stable Perovskite Photovoltaics

et al. 2022

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The generation of photoinduced defects and freely moving halogen ions is dynamically updated in real time. Accordingly, most reported strategies are static and short‐term, which make their improvements in photostability very limited. Therefore, seeking new passivation strategies to match the dynamic characteristics of defect generation is very urgent. Without newly generated defects, a passivation molecule should exist in the configuration that would not become the initiation sites for defect generation. With newly generated defects, the passivation molecule should transfer into the other configuration that possesses the passivation sites. Herein, a classical photoisomeric molecule, spiropyran, is adopted, whose pre‐ and post‐isomeric forms meet the requirements for two different configurations, to realize the state transition once the photoinduced defects appear during subsequent operation and dynamic capture for continuous renewal of defects. Consequently, spiropyrans work as light‐triggered and self‐healing sustainable passivation sites to realize continuous defect repair. The target devices retain 93% and 99% of their initial power conversion efficiencies after 456 h aging under ultraviolet illumination and 1200 h aging under full‐spectrum illumination, respectively. This work provides a novel concept of sustainable passivation strategy to realize continuous defect‐passivation and film‐healing in perovskite photovoltaics.

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Synergistic Full‐Scale Defect Passivation Enables High‐Efficiency and Stable Perovskite Solar Cells

Wen,

Zhang,

Guo

et al. 2023

Advanced Energy Materials

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Despite remarkable progress in perovskite solar cells (PSCs), the unsatisfying stability strongly interrelated with the defect density remains the main obstacle for commercialization. Herein, a synergetic defect passivation method is judiciously designed that consists of a precursor engineering strategy based on an ionic liquid 1‐butylsulfonate‐3‐methylimidazolium dihydrogen phosphate (BMDP), and two‐stage annealing (TSA) treatment to sufficiently passivate defects and enhance performance further. It is found that the multifunctional groups from BMDP have strong chemical interactions and form chelated complexes with perovskite components thus effectively passivating the intrinsic defects. Synergized by the sequential TSA treatment, the formed hydrophobic complexes can be precisely controlled with filling along grain boundaries (GBs) and on surfaces, leading to a wrapping of perovskite grains and significant passivation of GBs. Consequently, both deep‐ and shallow‐level defects in the bulk, at GBs and surface are sufficiently passivated, resulting in a champion efficiency of 24.20%. Impressively, the resultant unencapsulated films and corresponding devices exhibit admirable stability with maintaining 83.9% of initial composition for 4000 h of aging in moist air, 81.7% original structure after continuous heating for 1600 h, and 97% initial power conversion efficiency for 1000 h under continuous illumination. This work provides an efficient strategy toward improved efficiency and stability PSCs.

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Reactive Inhibition Strategy for Triple‐cation Mixed‐halide Perovskite Ink with Prolonged Shelf‐life

Cited by 18 publications

References 43 publications

Method to Inhibit Perovskite Solution Aging: Induced by Perovskite Microcrystals

Method to Inhibit Perovskite Solution Aging: Induced by Perovskite Microcrystals

Light‐Triggered Sustainable Defect‐Passivation for Stable Perovskite Photovoltaics

Synergistic Full‐Scale Defect Passivation Enables High‐Efficiency and Stable Perovskite Solar Cells

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