Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

Solari, Simon F.; Kumar, Sudhir; Jagielski, Jakub; Shih, Chih‐Jen

doi:10.1002/jsid.834

Cited by 12 publications

(7 citation statements)

References 73 publications

(190 reference statements)

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“…Using the colloidal 2D FAPbBr 3 NCs with a fwhm of 22.8 nm peaking at 529 nm, a coverage of >98% Rec. 2020 has been reported (Figure a,b). ,, We consider that the perovskite NC emitters would be the most promising candidate reaching 100% of the Rec. 2020 color gamut among all semiconductor systems.…”

Section: Applicationsmentioning

confidence: 76%

State of the Art and Prospects for Halide Perovskite Nanocrystals

et al. 2021

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Metal-halide perovskites have rapidly emerged as one of the most promising materials of the 21st century, with many exciting properties and great potential for a broad range of applications, from photovoltaics to optoelectronics and photocatalysis. The ease with which metal-halide perovskites can be synthesized in the form of brightly luminescent colloidal nanocrystals, as well as their tunable and intriguing optical and electronic properties, has attracted researchers from different disciplines of science and technology. In the last few years, there has been a significant progress in the shape-controlled synthesis of perovskite nanocrystals and understanding of their properties and applications. In this comprehensive review, researchers having expertise in different fields (chemistry, physics, and device engineering) of metal-halide perovskite nanocrystals have joined together to provide a state of the art overview and future prospects of metal-halide perovskite nanocrystal research.

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Section: Applicationsmentioning

confidence: 76%

State of the Art and Prospects for Halide Perovskite Nanocrystals

et al. 2021

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“…Inarguably, the greatest one is about the toxicity of lead. 11 Following the development of lead-free MHP PVs, divalent cations with similar ionic radii, such as Sn 2+ or Eu 2+ , were examined. 12,13 However, most lead-free perovskite NCs either compromised their optical properties or colloidal stability.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The actual implementation of APbX 3 NCs in photonic devices toward commercialization, however, has faced a number of challenges. Inarguably, the greatest one is about the toxicity of lead . Following the development of lead-free MHP PVs, divalent cations with similar ionic radii, such as Sn 2+ or Eu 2+ , were examined. , However, most lead-free perovskite NCs either compromised their optical properties or colloidal stability. − Accordingly, lead-reduced MHPs, − in which the B-site lead ions are partially replaced, have become increasingly attractive. , Lead-reduced MHP NCs have been synthesized using the hot-injection (HI) method, ,− where a complex reaction setup is required, as well as the postsynthetic approaches by doping with Mg 2+ , Mn 2+ , Sn 2+ , Cd 2+ , and Zn 2+ . ,− It is noted that the latter approach had rather limited success as compared to the postsynthetic A- and X-site mixing owing to the structural rigidity of PbX 6 4– octahedron .…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Lead-Reduced Metal Halide Perovskite Nanocrystals by High-Entropy Alloying

et al. 2022

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Colloidal metal halide perovskite (MHP) nanocrystals (NCs) are an emerging class of fluorescent quantum dots (QDs) for next-generation optoelectronics. A great hurdle hindering practical applications, however, is their high lead content, where most attempts addressing the challenge in the literature compromised the material's optical performance or colloidal stability. Here, we present a postsynthetic approach that stabilizes the lead-reduced MHP NCs through high-entropy alloying. Upon doping the NCs with multiple elements in considerably high concentrations, the resulting high-entropy perovskite (HEP) NCs remain to possess excellent colloidal stability and narrowband emission, with even higher photoluminescence (PL) quantum yields, η PL , and shorter fluorescence lifetimes, τ PL . The formation of multiple phases containing mixed interstitial and doping phases is suggested by X-ray crystallography. Importantly, the crystalline phases with higher degrees of lattice expansion and lattice contraction can be stabilized upon high-entropy alloying. We show that the lead content can be approximately reduced by up to 55% upon high-entropy alloying. The findings reported here make one big step closer to the commercialization of perovskite NCs.

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“…[1][2][3] These properties are well suited for electrical and optical applications such as photovoltaics, light-emitting diodes, resistive-switching memory devices, and eld-effect transistors. [4][5][6][7] Among various applications, perovskite-based solar cells (PSCs) conspicuously have achieved a certi ed power conversion e ciency (PCE) of 25.5 % within ten years of development, comparable to that of monocrystalline silicon based solar cells. [8] However, one of the challenging issues that hinders successful commercialization of PSCs is still low operational stability.…”

Section: Introductionmentioning

confidence: 99%

Soft X-ray Characterization of Halide Perovskite Film by Scanning Transmission X-ray Microscopy

Jun

Lee

Tondelier

et al. 2022

Preprint

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Organic-inorganic metal halide perovskites (MHPs) have recently been receiving a lot of attention due to their newfound application in optoelectronic devices, including perovskite solar cells (PSCs) which has reached power conversion efficiencies as high as 25.5%. However, the fundamental mechanisms in PSCs, including the correlation of degradation with the excellent optoelectrical properties of the perovskite absorbers, are poorly understood. In this paper, we have explored synchrotron-based soft X-ray characterization as an effective technique for the compositional analysis of MHP thin films. Most synchrotron-based studies used for investigating MHP so far are based on hard X-rays (5–10 keV) which includes various absorption edges (Pb L-edge, I L-edge, Br K-edge, etc.) but are not suited for the analysis of the organic component in MHPs. In order to be sensitive to a maximum number of elements, we have employed soft X-ray-based scanning transmission X-ray microscopy (STXM) as a spectro-microscopy technique for the characterization of MHPs. We examined its sensitivity to iodine and organic components, aging, or oxidation by-products in MHPs to make sure that our suggested method is suitable for studying MHPs. Furthermore, methylammonium triiodide with different deposition ratios of PbI2 and CH3NH3I (MAI), and different thicknesses, were characterized for chemical inhomogeneity at the nanoscale by STXM. Through these measurements, we demonstrate that STXM is very sensitive to MHP chemical composition and homogeneity. Thus, we highlight the utility of STXM for an in-depth analysis of physical and chemical phenomena in PSCs.

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Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

Cited by 12 publications

References 73 publications

State of the Art and Prospects for Halide Perovskite Nanocrystals

State of the Art and Prospects for Halide Perovskite Nanocrystals

Stabilization of Lead-Reduced Metal Halide Perovskite Nanocrystals by High-Entropy Alloying

Soft X-ray Characterization of Halide Perovskite Film by Scanning Transmission X-ray Microscopy

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