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Showing 1–12 of 12 results
Advanced filters: Author: Sergii Yakunin Clear advanced filters

  • Solid-state X-ray detectors have enabled real-time diagnostics as well as reduced patient dose. Now researchers have shown that potentially inexpensive perovskites can be used for efficient X-ray imaging.

    • Sergii Yakunin
    • Mykhailo Sytnyk
    • Wolfgang Heiss
    Research
    Nature Photonics
    Volume: 9, P: 444-449

  • Lead halide perovskite colloidal nanocrystals have promising optoelectronic properties, such as high photoluminescence quantum yields and narrow emission linewidths. Here, the authors report low-threshold amplified spontaneous emission and two kinds of lasing in nanostructured caesium lead halide perovskites.

    • Sergii Yakunin
    • Loredana Protesescu
    • Maksym V. Kovalenko
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-9

  • Designing effective covert security features is highly regarded to deter counterfeit of goods and currency in the global markets. Here, the authors present an electrohydrodynamically printed unicolour multifluorescent-lifetime security tag system based on perovskite to provide an alternative yet affordable solution.

    • Sergii Yakunin
    • Jana Chaaban
    • Maksym V. Kovalenko
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-8

  • A colour sensor array based on multilayer monolithically stacked lead halide perovskite thin-film photodetectors achieves higher quantum efficiency and superior colour accuracy compared to conventional filter-based image sensors.

    • Sergey Tsarev
    • Daria Proniakova
    • Maksym V. Kovalenko
    ResearchOpen Access
    Nature
    Volume: 642, P: 592-598

  • The high polarity of colloidal inorganic-ligand-functionalized nanocrystals can be problematic for their processing, limiting their optoelectronic applications. Here, by complexation with macrocycles, the authors enabled broad amphiphilicity of such nanocrystals and processing from a variety of solvents.

    • Maryna I. Bodnarchuk
    • Sergii Yakunin
    • Maksym V. Kovalenko
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-8

  • A Fourier-transform waveguide spectrometer is demonstrated by using HgTe-quantum-dot-based photoconductors with a spectral response up to a wavelength of 2 μm. The spectral resolution is 50 cm–1. The total active spectrometer volume is below 100 μm × 100 μm × 100 μm.

    • Matthias J. Grotevent
    • Sergii Yakunin
    • Ivan Shorubalko
    ResearchOpen Access
    Nature Photonics
    Volume: 17, P: 59-64

  • We show perovskite X-ray detection at zero-voltage bias with operational device stability exceeding one year. Detection efficiency of 88% and noise-equivalent dose of 90 pGyair are obtained with 18 keV X-rays, allowing single-photon-sensitive, low-dose and energy-resolved X-ray imaging.

    • Kostiantyn Sakhatskyi
    • Bekir Turedi
    • Maksym V. Kovalenko
    ResearchOpen Access
    Nature Photonics
    Volume: 17, P: 510-517

  • Here we report an inexpensive, solution-phase growth of cm-scale single crystals of variable composition CsxFA1−xPbI3−yBry (FA=formamidinium, x=0–0.1, y=0–0.6), which exhibit improved phase stability compared to the parent α-FAPbI3 compound. High-carrier mobility–lifetime product of up to 1.2 × 10−1 cm2 V−1 and a low dark carrier density, combined with the high absorptivity of high-energy photons by Pb and I, allow the sensitive detection of gamma radiation. With stable operation up to 30 V, these novel perovskite materials have been used in a prototype of a gamma-counting dosimeter.

    • Olga Nazarenko
    • Sergii Yakunin
    • Maksym V Kovalenko
    ResearchOpen Access
    NPG Asia Materials
    Volume: 9, P: e373

  • Solution-grown single crystals (SCs) of semiconducting methylammonium lead halide perovskites are promising materials for full-colour imaging. Here we show one-pixel photodetector prototype, constructed by stacking three layers of blue-, green- and red-sensitive MAPbCl3, MAPbBr3 and MAPb(Br/I)3 crystals, respectively. This layered structure concept has several advantages: imparting a two- to three-fold reduction in the number of required pixels, three times more efficient light utilization (and thus higher sensitivity) than common Bayer filters scheme, colour moiré suppression and no need for de-mosaic image processing. In addition, the direct band gap structure of perovskites results in optical absorption that is several orders of magnitude greater than silicon.

    • Sergii Yakunin
    • Yevhen Shynkarenko
    • Maksym V Kovalenko
    ResearchOpen Access
    NPG Asia Materials
    Volume: 9, P: e431