Surface stability of ionic-liquid-passivated mixed-cation perovskite probed with<i>in situ</i>photoelectron spectroscopy

Maniyarasu, Suresh; Spencer, Ben F.; Mo, Hongbo; Walton, Alex S.; Thomas, Andrew G.; Flavell, Wendy R.

doi:10.1039/d2ta03748c

Cited by 17 publications

(4 citation statements)

References 56 publications

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Section: Grain Size Enlargementmentioning

confidence: 99%

“…Another precursor additive OMIMCl with a similar structure was adopted to slow down the crystallization, which was ascribed to the higher boiling point of the IL than DMF and DMSO. 107 Zheng et al reported that with an IL additive TBAPF 6 , PF 6 − anions could partially substitute the halide ions and chelate Pb 2+ cations, which was beneficial to slow down the crystal growth. 108 In addition, the alkyl chain in TBA + may also alter the crystallization, enabling an enlarged perovskite grain size with improved surface coverage.…”

Section: Improvement Of Crystalline Propertymentioning

confidence: 99%

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Recent advances in ionic molecules applied in perovskite solar cells

Xie,

Wu,

Gao

2024

J. Mater. Chem. C

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Section: Grain Size Enlargementmentioning

confidence: 99%

Section: Improvement Of Crystalline Propertymentioning

confidence: 99%

Recent advances in ionic molecules applied in perovskite solar cells

Xie,

Wu,

Gao

2024

J. Mater. Chem. C

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“…The use of ionic liquids (ILs) seems to be one of the potential solutions to some of the perovskite solar cells problems, due to their high conductivity, potential for chemical “tuning” of the structure, and relatively smaller environmental impact. , Maniyarasu et al studied the role of IL additives in improving the stability of perovskite is investigated by in situ photoemission spectroscopy while increasing the temperature. A small amount (0.3 mol %) of 1-octyl-3-methylimidazolium chloride was incorporated into FA 0.9 Cs 0.1 PbI 3 perovskites.…”

Section: In Situ Characterization Of Metal Halide Perovskitesmentioning

confidence: 99%

In Situ and Operando Characterizations of Metal Halide Perovskite and Solar Cells: Insights from Lab-Sized Devices to Upscaling Processes

et al. 2023

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The performance and stability of metal halide perovskite solar cells strongly depend on precursor materials and deposition methods adopted during the perovskite layer preparation. There are often a number of different formation pathways available when preparing perovskite films. Since the precise pathway and intermediary mechanisms affect the resulting properties of the cells, in situ studies have been conducted to unravel the mechanisms involved in the formation and evolution of perovskite phases. These studies contributed to the development of procedures to improve the structural, morphological, and optoelectronic properties of the films and to move beyond spin-coating, with the use of scalable techniques. To explore the performance and degradation of devices, operando studies have been conducted on solar cells subjected to normal operating conditions, or stressed with humidity, high temperatures, and light radiation. This review presents an update of studies conducted in situ using a wide range of structural, imaging, and spectroscopic techniques, involving the formation/ degradation of halide perovskites. Operando studies are also addressed, emphasizing the latest degradation results for perovskite solar cells. These works demonstrate the importance of in situ and operando studies to achieve the level of stability required for scale-up and consequent commercial deployment of these cells.

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“…Control of the composition and morphology of perovskite thin films is key to enhancing both the stability and performance of devices. Defects are known to accelerate the decomposition of perovskites on exposure to atmospheric conditions, as well as through ion migration during device operation. − Grain size has also been shown to influence perovskite degradation, with larger grains proving to be more robust when exposed to moisture …”

Section: Introductionmentioning

confidence: 99%

Elucidating the Mechanism of Self-Healing in Hydrogel-Lead Halide Perovskite Composites for Use in Photovoltaic Devices

Zhao,

Flavell,

Aljuaid

et al. 2023

ACS Appl. Mater. Interfaces

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Since the emergence of organometal halide perovskite (OMP) solar cells, there has been growing interest in the benefits of incorporating polymer additives into the perovskite precursor, in terms of both photovoltaic device performance and perovskite stability. In addition, there is interest in the self-healing properties of polymer-incorporated OMPs, but the mechanisms behind these enhanced characteristics are still not fully understood. Here, we study the role of poly(2-hydroxyethyl methacrylate) (pHEMA) in improving the stability of methylammonium lead iodide (MAPI, CH3NH3PbI3) and determine a mechanism for the self-healing of the perovskite–polymer composite following exposure to atmospheres of differing relative humidity, using photoelectron spectroscopy. Varying concentrations of pHEMA (0–10 wt %) are incorporated into a PbI2 precursor solution during the conventional two-step fabrication method for producing MAPI. It is shown that the introduction of pHEMA results in high-quality MAPI films with increased grain size and reduced PbI2 concentration compared with pure MAPI films. Devices based on pHEMA-MAPI composites exhibit an improved photoelectric conversion efficiency of 17.8%, compared with 16.5% for a pure MAPI device. pHEMA-incorporated devices are found to retain 95.4% of the best efficiency after ageing for 1500 h in 35% RH, compared with 68.5% achieved from the pure MAPI device. The thermal and moisture tolerance of the resulting films is investigated using X-ray diffraction, in situ X-ray photoelectron spectroscopy (XPS), and hard XPS (HAXPES). It is found that exposing the pHEMA films to cycles of 70 and 20% relative humidity leads to a reversible degradation, via a self-healing process. Angle-resolved HAXPES depth-profiling using a non-destructive Ga Kα source shows that pHEMA is predominantly present at the surface with an effective thickness of ca. 3 nm. It is shown using XPS that this effective thickness reduces with increasing temperature. It is found that N is trapped in this surface layer of pHEMA, suggesting that N-containing moieties, produced during reaction with water at high humidity, are trapped in the pHEMA film and can be reincorporated into the perovskite when the humidity is reduced. XPS results also show that the inclusion of pHEMA enhances the thermal stability of MAPI under both UHV and 9 mbar water vapor pressure.

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Surface stability of ionic-liquid-passivated mixed-cation perovskite probed within situphotoelectron spectroscopy

Abstract: A passivation treatment is proposed that improves perovskite photovoltaic device performance and stability to annealing in dry environments. A rationale is presented for the observed loss of stability on heating in wet environments.

Cited by 17 publications

References 56 publications

Recent advances in ionic molecules applied in perovskite solar cells

Recent advances in ionic molecules applied in perovskite solar cells

In Situ and Operando Characterizations of Metal Halide Perovskite and Solar Cells: Insights from Lab-Sized Devices to Upscaling Processes

Elucidating the Mechanism of Self-Healing in Hydrogel-Lead Halide Perovskite Composites for Use in Photovoltaic Devices

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