Two-Step Hybrid Passivation Strategy for Ultrastable Photoluminescence Perovskite Nanocrystals

Jing, Yao; Cao, Kun; Zhou, Beitong; Geng, Shicai; Wen, Yanwei; Shan, Bin; Chen, Rong

doi:10.1021/acs.chemmater.0c03831

Cited by 44 publications

(51 citation statements)

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“…5 (b)The photo stability of CsPbBr3 NCs by two-step hybrid passivation strategy. 6 Reprinted (adapted) with permission from (COMPLETE REFERENCE CITATION). Copyright (YEAR) American Chemical Society.…”

Section: Figure 1 (A)mentioning

confidence: 99%

“…Copyright (YEAR) American Chemical Society. 5,6 At present, researches on quantum dot materials based on atomic layer deposition technology are mainly divided into three categories: 1. ALD technology was used to coat and modify the surface to obtain high quality photoluminescence and electroluminescence thin film luminescence layer.…”

Section: Figure 1 (A)mentioning

confidence: 99%

“…To simultaneously enhance the photoluminescence quantum yield and the stability of perovskite QDs, a hybrid passivation strategy was developed by two-step modification with surface halogen replenishment and ALD. 6 Initially, the organic ligands density of CsPbBr3 QDs was reduced through increasing the purification times and then treated with ZnBr2/hexane solution to compensate the surface halogen, which was vital to subsequent ALD process. Subsequently, a low-temperature ALD method was exploited to encapsulate the CsPbBr3 QDs film with AlOx.…”

Section: Introductionmentioning

confidence: 99%

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28.3: Stabilization of photoluminescence perovskite nanocrystals via atomic layer deposition and the process influences

Lei

Jing

Zhou

et al. 2021

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We report the effects of low temperature atomic layer deposition (ALD) environment treatment on the photoluminescence properties and stability of perovskite quantum dot films. Compared with conventional chemical centrifugation, the loss of photoluminscence can be reduced by physical pressure and temperature control. The photoluminescence properties and long‐term stability of the films can be improved by vacuum heating and washing with weak polar solvents to reduce the content of organic matter on the surface. It also suggests that the colloidal environment of organic solvent and the air environment of device structure should be separated to explain the mechanism of stability during the preparation of QDs films by solution method. Besides, it provides a vision for further interpretation of the luminescence properties of quantum dot thin film materials by using ALD to accurately control the atmosphere, temperature and pressure.

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Section: Figure 1 (A)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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28.3: Stabilization of photoluminescence perovskite nanocrystals via atomic layer deposition and the process influences

Lei

Jing

Zhou

et al. 2021

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“…Despite these developments, little research has investigated the complex interplay between macro and micro‐scale optoelectronic behavior of perovskite‐PV devices for indoor applications, which is crucial to enhance their performance. This understanding can be achieved by performing macroscopic optical measurements, e.g., current‐voltage [ 5 ] and photoluminance, [ 6 ] in conjunction with scanning probe microscopy (SPM) with high spatial resolution, [ 7 ] such as conductive atomic force microscopy (c‐AFM), [ 8 ] which maps electronic transport capability, [ 9 ] ion migration, [ 10 ] surface hysteresis, [ 11 ] ferroelectric polarization, [ 12 ] and face orientation of PSCs. [ 11,13 ] In addition to c‐AFM, Kelvin probe force microscopy (KPFM) has been implemented to evaluate the device performance [ 14 ] and to gain an improved understanding of the local charge carrier movement mechanism, which includes charge carrier generation, [ 15 ] accumulation, [ 16 ] recombination, [ 17 ] transport, [ 18 ] relaxation, [ 19 ] and extraction at the electrode.…”

Section: Introductionmentioning

confidence: 99%

Probing Charge Carrier Properties and Ion Migration Dynamics of Indoor Halide Perovskite PV Devices Using Top‐ and Bottom‐Illumination SPM Studies

Alosaimi

Shin

Chin

et al. 2021

Advanced Energy Materials

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Recently, perovskite solar cells have shown excellent performance under indoor light conditions. In a new approach using directional illumination combined with nanoscale scanning probe microscopy (SPM) characterization, morphology dependent‐charge transport measurements are performed to provide a comprehensive understanding of the optoelectronic behavior of (FAPbI3)0.85(MAPbBr3)0.15 containing 5 vol% cesium (Cs5vol%) with various electron transport layers (ETLs), i.e., SnO2, c‐TiO2, and [6,6]‐phenyl‐C61‐butyric acid methyl ester/SnO2 under indoor light. This approach allows the identification of the charge transport properties of the perovskite film and the perovskite/ETL interface separately. The light is applied from the top of the perovskite film to study the electronic properties of the surface. Lower photocurrent and lower surface photovoltage (SPV) are observed under top‐illumination conditions. The electronic interface behavior is investigated using bottom‐illumination and short excitation wavelengths, such as blue LED light. Higher photocurrent and higher SPV are observed under blue light illumination from the bottom. These results suggest that the charge transport capability is enhanced near the p–n junction. Conductive atomic force microscopy results show that SnO2 enhances the charge collection properties of the perovskite's grain boundaries (GBs). Kelvin probe force microscopy results confirm that SnO2 exhibits homogeneous and high surface potential because of the lowest trap states at GBs.

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“…[16][17][18] Besides, the pinhole-free films with high densification could be obtained with low-temperature ALD process. [19] Thus, ALD-based encapsulation structures have been developed to be applied to the flexible displays. [20][21][22] As for the inorganic barriers, Choi et al revealed that with the thickening of the barrier layer, the WVTR value would decrease and saturate at a specific thickness.…”

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Flexible PDMS/Al₂O₃ Nanolaminates for the Encapsulation of Blue OLEDs

Liu

Xiong

Cao

et al. 2021

Adv Materials Inter

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senstive to the permeated moisture or oxygen due to the simultaneous intrinstic instability and the broad bandgap energies, which has become the bottleneck of the next-generation display technologies. [6,7] The reliable encapsulation structures would be necessary for the flexible displays to reach the designed lifespan, and the water vapor transmission rate (WVTR) of which ought to be below 10 -5 g m −2 day −1 in the ambient. [8,9] Although the glass/metal lids could meet the requirement of the barrier property, they are not compatible with the flexible display when the external strain was applied. Thus, thin film encapsulation (TFE) has become an attractive method which could provide the flexible encapsulation layer over the large-area displays. [10][11][12] Various inorganic films (such as SiN x , SiO 2 , SiO x N y ) have been applied to the encapsulation of flexible displays via thermal evaporation, [13] plasma-enhanced chemical vapor deposition, [14,15] etc. However, the low-temperature process is needed to protect the organic materials from the thermal damage, which leads to the decreasing film density. Among the various thin film deposition methods, atomic layer deposition (ALD) possesses the advantages of precise thickness control at atomic level, excellent uniformity, and conformality over large areas. [16][17][18] Besides, the pinhole-free films with high densification could be obtained with low-temperature ALD process. [19] Thus, ALD-based encapsulation structures have been developed to be applied to the flexible displays. [20][21][22] As for the inorganic barriers, Choi et al. revealed that with the thickening of the barrier layer, the WVTR value would decrease and saturate at a specific thickness. [23] However, the barrier property would degrade with the further increase of the film thickness. Behrendt et al. found that as for the inorganic barriers with several hundred nanometers, the delamination or cracking behavior occurred around the particle contamination when stored in the damp heat condition. [24] Chen et al. revealed that the increasing stored elastic energy aroused by the increasing film thickness and residual stress led to mechanical instability and degraded barrier property. [25,26] Besides, George et al. demonstrated that the thicker inorganic films possessed the significantly decreased critical tensile or compressive strain, which was not beneficial for them to be applied to the encapsulation of flexible displays. [27] The inorganic/organic multilayers have been proposed to improve the flexibility as well as maintain the barrier property In this work, the polydimethylsiloxane (PDMS)/Al 2 O 3 nanolaminates with optimized sublayer thickness and interfaces have been developed to protect the organic light-emitting didoes (OLEDs) from the erosion of the moisture in the ambient. The O 2 plasma pretreatment is used to tune the wettability of the ultrathin PDMS sublayers with nanoscale thickness, and the distinct interfaces between the Al 2 O 3 and PDMS sublayers are obtained. The electrical cal...

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Two-Step Hybrid Passivation Strategy for Ultrastable Photoluminescence Perovskite Nanocrystals

Cited by 44 publications

References 61 publications

28.3: Stabilization of photoluminescence perovskite nanocrystals via atomic layer deposition and the process influences

28.3: Stabilization of photoluminescence perovskite nanocrystals via atomic layer deposition and the process influences

Probing Charge Carrier Properties and Ion Migration Dynamics of Indoor Halide Perovskite PV Devices Using Top‐ and Bottom‐Illumination SPM Studies

Flexible PDMS/Al₂O₃ Nanolaminates for the Encapsulation of Blue OLEDs

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Two-Step Hybrid Passivation Strategy for Ultrastable Photoluminescence Perovskite Nanocrystals

Cited by 44 publications

References 61 publications

28.3: Stabilization of photoluminescence perovskite nanocrystals via atomic layer deposition and the process influences

28.3: Stabilization of photoluminescence perovskite nanocrystals via atomic layer deposition and the process influences

Probing Charge Carrier Properties and Ion Migration Dynamics of Indoor Halide Perovskite PV Devices Using Top‐ and Bottom‐Illumination SPM Studies

Flexible PDMS/Al2O3 Nanolaminates for the Encapsulation of Blue OLEDs

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Product

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Flexible PDMS/Al₂O₃ Nanolaminates for the Encapsulation of Blue OLEDs