Achieving long carrier lifetime and high optical gain in all-inorganic CsPbBr<sub>3</sub> perovskite films <i>via</i> top and bottom surface modification

Jiang, Li; Fang, Zhishan; Lou, Hans Olav Christensen; Lin, Chen; Chen, Zhanhang; Li, Jing; He, Haiping; Ye, Zhizhen

doi:10.1039/c9cp04033a

Cited by 26 publications

(35 citation statements)

References 44 publications

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“…All-inorganic cesium lead halide perovskite (CsPbX3, X = Cl, Br, I) nanocrystals (NCs) could offer significant advantages for applications in optoelectronic devices due to their narrow photoluminescence lines, high optical quantum efficiency and higher stability, compared with hybrid organic-inorganic perovskites. [1][2][3][4] However, their ionic nature, surface instability and the metastable structure leads to phase transition from cubic phase (α-phase) to orthorhombic phase (δ-phase) and degradation, [5][6][7][8] making them sensitive to environmental factors such as temperature, exposure to light and moisture.…”

Section: Introductionmentioning

confidence: 99%

DDAB-assisted synthesis of iodine-rich CsPbI₃ perovskite nanocrystals with improved stability in multiple environments

et al. 2020

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Section: Introductionmentioning

confidence: 99%

DDAB-assisted synthesis of iodine-rich CsPbI₃ perovskite nanocrystals with improved stability in multiple environments

et al. 2020

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“…This observation is compatible with previous studies which utilise higher carrier densities, and therefore observe longer carrier lifetimes to those reported here. 7,23 The threshold and the rate of change of the lifetime differ for the bulk and the surface -which likely reflects differences in the carrier traps in these regions.…”

Section: Resultsmentioning

confidence: 99%

Holistic Determination of Optoelectronic Properties using High-Throughput Spectroscopy of Surface-Guided CsPbBr$_3$ Nanowires

Church¹,

Choi²,

Al-Amairi³

et al. 2022

Preprint

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Optoelectronic micro-and nanostructures have a vast parameter space to explore for modification and optimisation of their functional performance. This paper reports on a data-led approach using high-throughput single nanostructure spectroscopy to probe > 8,000 structures, allowing for holistic analysis of multiple material and optoelectronic parameters with statistical confidence. The methodology is applied to surface-guided CsPbBr 3 nanowires, which have complex and interrelated geometric, structural and electronic properties. Photoluminescence-based measurements, studying both the surface and embedded interfaces, exploits the natural inter-nanowire geometric variation 1 to show that increasing the nanowire width reduces the optical bandgap, increases the recombination rate in the nanowire bulk and reduces the rate at the surface interface.A model of carrier recombination and diffusion is developed which ascribes these trends to carrier density and strain effects at the interfaces and self-consistently retrieves values for carrier mobility, trap densities, bandgap, diffusion length and internal quantum efficiency. The model predicts parameter trends, such as the variation of internal quantum efficiency with width, which is confirmed by experimental verification. As this approach requires minimal a-priori information, it is widely applicable to nano-and micro-scale materials.

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“…The aforementioned stratified morphology could lower the trap density and decrease the non-radiative recombination losses (Figure 3B). [22][23]…”

Section: Morphologies and Role Of Peo In The Two-step Methodsmentioning

confidence: 99%

Low‐Threshold Amplified Spontaneous Emission from Air‐Stable CsPbBr₃ Perovskite Films Containing Trace Amounts of Polyethylene Oxide

Tian

Liu

et al. 2021

ChemPlusChem

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Organic additives can enhance the amplified spontaneous emission (ASE) performance of inorganic cesium lead halide perovskites (CsPbBr3) but volatility, potential hygroscopicity and oxidative degradation of these additives jeopardizes the thermal stability and shelf‐life of blended CsPbBr3 films. To address this problem, we have fabricated perovskite films in a two‐step solution protocol involving as little added polyethylene oxide (PEO) as possible. These films exhibited enhanced crystallization, improved photoluminescence (PL) intensity and prolonged lifetimes. Their hierarchical morphology and surface passivation lowered the ASE threshold from 278 to 176 μЈ/cm2 under one‐photon nanosecond laser excitation. The proportion of added PEO was 0.3 wt% and was subsequently almost fully removed, thereby reducing its adverse influence on the stability of resulting films under continuous pulsed laser excitation. Stable ASE spectra could be stimulated after storage in air for 10 months.

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Achieving long carrier lifetime and high optical gain in all-inorganic CsPbBr₃ perovskite films via top and bottom surface modification

Abstract: Modifying both the top and bottom surfaces of CsPbBr3 perovskite films enhances carrier lifetime and optical gain remarkably.

Cited by 26 publications

References 44 publications

DDAB-assisted synthesis of iodine-rich CsPbI₃ perovskite nanocrystals with improved stability in multiple environments

DDAB-assisted synthesis of iodine-rich CsPbI₃ perovskite nanocrystals with improved stability in multiple environments

Holistic Determination of Optoelectronic Properties using High-Throughput Spectroscopy of Surface-Guided CsPbBr$_3$ Nanowires

Low‐Threshold Amplified Spontaneous Emission from Air‐Stable CsPbBr₃ Perovskite Films Containing Trace Amounts of Polyethylene Oxide

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Achieving long carrier lifetime and high optical gain in all-inorganic CsPbBr3 perovskite films via top and bottom surface modification

Abstract: Modifying both the top and bottom surfaces of CsPbBr3 perovskite films enhances carrier lifetime and optical gain remarkably.

Cited by 26 publications

References 44 publications

DDAB-assisted synthesis of iodine-rich CsPbI3 perovskite nanocrystals with improved stability in multiple environments

DDAB-assisted synthesis of iodine-rich CsPbI3 perovskite nanocrystals with improved stability in multiple environments

Holistic Determination of Optoelectronic Properties using High-Throughput Spectroscopy of Surface-Guided CsPbBr$_3$ Nanowires

Low‐Threshold Amplified Spontaneous Emission from Air‐Stable CsPbBr3 Perovskite Films Containing Trace Amounts of Polyethylene Oxide

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Product

Resources

About

Achieving long carrier lifetime and high optical gain in all-inorganic CsPbBr₃ perovskite films via top and bottom surface modification

DDAB-assisted synthesis of iodine-rich CsPbI₃ perovskite nanocrystals with improved stability in multiple environments

DDAB-assisted synthesis of iodine-rich CsPbI₃ perovskite nanocrystals with improved stability in multiple environments

Low‐Threshold Amplified Spontaneous Emission from Air‐Stable CsPbBr₃ Perovskite Films Containing Trace Amounts of Polyethylene Oxide