High-Speed Ultraviolet-C Photodetector Based on Frequency Down-Converting CsPbBr3 Perovskite Nanocrystals on Silicon Platform

Kang, Chun Hong; Ng, Tien Khee; Mohammed, Omar F.; Bakr, Osman M.; Ooi, Boon S.; Dursun, İbrahim; Li, Guangyu; Sinatra, Lutfan; Sun, Xiaobin; Kong, Meiwei; Pan, Jun; Ooi, Ee-Ning

doi:10.1109/ipcon.2019.8908415

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…[3][4][5][6][7][8][9] With emission wavelengths tunable throughout the visible range, quantum yields approaching unity, cheap and facile syntheses, and abundant precursor materials, potential applications range from light emission (light-emitting diodes (LEDs), lasers, and displays) to solar cells, photodetectors, field-effect transistors, and even photocatalysis. [10][11][12][13][14] Despite sounding like the perfect material, halide perovskites also (currently) exhibit limitations that have been impeding their widespread commercialization. Perhaps the most critical property in this regard is stability, as incorporated NCs need to survive for the intended lifespan of the device.…”

Section: Introductionmentioning

confidence: 99%

Energy Transfer in Stability-Optimized Perovskite Nanocrystals

et al. 2022

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Outstanding optoelectronic properties and a facile synthesis render halide perovskite nanocrystals (NCs) a promising material for nanostructure-based devices. However, the commercialization is hindered mainly by the lack of NC stability under ambient conditions and inefficient charge carrier injection. Here, we investigate solutions to both problems, employing methylammonium lead bromide (MAPbBr 3 ) NCs encapsulated in diblock copolymer core-shell micelles of tunable size.We confirm that the shell does not prohibit energy transfer, as FRET efficiencies between these NCs and 2D CsPbBr 3 nanoplatelets (NPLs) reach 73.6%. This value strongly correlates to the micelle size, with thicker shells displaying significantly reduced FRET efficiencies. Those high 2 efficiencies come with a price, as the thinnest shells protect the encapsulated NCs less from environmentally induced degradation. Finding the sweet spot between efficiency and protection could lead to the realization of tailored energy funnels with enhanced carrier densities for highpower perovskite NC-based optoelectronic applications.

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Section: Introductionmentioning

confidence: 99%

Energy Transfer in Stability-Optimized Perovskite Nanocrystals

et al. 2022

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“…While these EQEs are far from those offered by InGaN-based LEDs, easy solution-processability makes these materials attractive for applications in solid-state lighting and nextgeneration display technologies [164,[173][174][175][176][177]. In addition, various perovskite-based photodetectors with high responsivities [178][179][180], flexibility [181][182][183][184], and fast response speeds [150,178,[185][186][187] have also been demonstrated widely [188].…”

Section: State-of-the-art Devicesmentioning

confidence: 99%

Group-III-nitride and halide-perovskite semiconductor gain media for amplified spontaneous emission and lasing applications

Ng¹,

Holguín‐Lerma²,

Kang³

et al. 2021

J. Phys. D: Appl. Phys.

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Group-III-nitride optical devices are conventionally important for displays and solid-state lighting, and recently have garnered much interest in the field of visible-light communication. While visible-light laser technology has become mature, developing a range of compact, small footprint, high optical power components for the green-yellow gap wavelengths still requires material development and device design breakthroughs, as well as hybrid integration of materials to overcome the limitations of conventional approaches. The present review focuses on the development of laser and amplified spontaneous emission (ASE) devices in the visible wavelength regime using primarily group-III-nitride and halide-perovskite semiconductors, which are at disparate stages of maturity. While the former is well established in the violet-blue-green operating wavelength regime, the latter, which is capable of solution-based processing and wavelength-tunability in the green-yellow-red regime, promises easy heterogeneous integration to form a new class of hybrid semiconductor light emitters. Prospects for the use of perovskite in ASE and lasing applications are discussed in the context of facile fabrication techniques and promising wavelength-tunable light-emitting device applications, as well as the potential integration with group-III-nitride contact and distributed Bragg reflector layers, which is promising as a future research direction. The absence of lattice-matching limitations, and the presence of direct bandgaps and excellent carrier transport in halide-perovskite semiconductors, are both encouraging and thought-provoking for device researchers who seek to explore new possibilities either experimentally or theoretically. These

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“…Their narrow absorption and emission line widths, tunable bandgaps, high exciton binding energies, easy of synthesis, high defect tolerance, and highly localized energy levels make them a great candidate for the state of the art electronic, optoelectronic, and photonic technologies. [1][2][3][4][5][6][7] Generally, colloidal 2D LHP NPLs have been synthesized using LARP or hot-injection techniques. 1,5,[8][9][10][11][12] In the LARP technique, LX, lead halide (PbX2), and AX salts are dissolved in a polar solvent such as dimethylformamide (DMF) or dimethyl sulfoxide (DMSO) and subsequently, proper amounts of these solutions are directly injected into nonsolvents such as toluene or hexane.…”

Section: Introductionmentioning

confidence: 99%

Seed Mediated Synthesis of Colloidal Halide Perovskite Nanoplatelets

Guvenc¹,

Balci

2021

Preprint

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Two-dimensional lead halide perovskite nanoplatelets (2D LHP NPLs) have been emerging as one of the most promising semiconductor nanomaterials due to their narrow absorption and emission line widths, tunable bandgaps, high exciton binding energies, high defect tolerance as well as highly localized energy states. Colloidal synthesis of 2D LHP NPLs is generally performed using hot-injection or ligand assisted precipitation techniques (LARP). In the LARP method, perovskites are synthesized in polar solvents, which decrease the stability of the 2D LHP NPLs due to their weakly bonded nature. In fact, the presence of residual polar solvent in the LHP NPL colloid can cause deterioration of thickness uniformity, degradation of NPLs to parent precursors, and undesired phase transformations. Herein, for the first time, we report facile seed-mediated synthesis route of monolayer, 2-monolayers, and thicker lead halide perovskite nanoplatelets without using A site cation halide salt (AX; A = Cesium, methylammonium, formamidinium and, X = Cl, Br, I) and long chain alkylammonium halide salts (LX; L = oleylammonium, octylammonium, butylammonium and, X = Cl, Br, I). The seed solution has been synthesized by reacting lead (II) halide salt and coordinating ligands (oleylamine or octylamine and oleic acid) in nonpolar high boiling solvent (1-octadecene). The seed mediated synthesis has been carried out in hexane by reacting seed solution with A-site cation precursors (Cs-oleate, FA-oleate, or diluted MA solution in hexane) under ambient conditions. More importantly, the seed mediated growth of NPLs has been tracked for the first time by performing in-situ optical measurements. Furthermore, the optical properties and morphologies of the seeds have been extensively studied. We find that our facile synthesis route provides highly stable, monodisperse NPLs with narrow absorption, and photoluminescence line widths (68-201 meV), and high PLQY (37.6-1.66% for 2ML NPLs). Furthermore, anion exchange reactions have been performed by mixing pre-synthesized LHP NPLs with counter halide seeds. The optical properties of NPLs have been affectively tuned by postsynthetic chemical reactions without changing the thickness of the NPLs. We anticipate that our new synthetic route provides further understanding of growth dynamics of LHP NPLs.

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High-Speed Ultraviolet-C Photodetector Based on Frequency Down-Converting CsPbBr₃ Perovskite Nanocrystals on Silicon Platform

Cited by 5 publications

References 3 publications

Energy Transfer in Stability-Optimized Perovskite Nanocrystals

Energy Transfer in Stability-Optimized Perovskite Nanocrystals

Group-III-nitride and halide-perovskite semiconductor gain media for amplified spontaneous emission and lasing applications

Seed Mediated Synthesis of Colloidal Halide Perovskite Nanoplatelets

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