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Showing 1–6 of 6 results
Advanced filters: Author: Namyoung Ahn Clear advanced filters

  • Improving the stability of perovskite solar cells remains crucial. Here, Ahn et al. show that trapped charges at grain boundaries induce the dissociation of the perovskite compound in the presence of moisture, and explain why degradation is irreversible under illumination and reversible in the dark.

    • Namyoung Ahn
    • Kwisung Kwak
    • Mansoo Choi
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-9

  • Liquid lasers based on solutions of colloidal quantum dots exhibit a trion-like optical gain state with suppressed Auger recombination, which combined with a Littrow optical cavity enables stable and tunable liquid-state lasing.

    • Donghyo Hahm
    • Valerio Pinchetti
    • Victor I. Klimov
    ResearchOpen Access
    Nature Materials
    Volume: 24, P: 48-55

  • Colloidal quantum dot devices demonstrating electrically pumped amplified spontaneous emission are described, showing strong, broadband optical gain and bright edge emission, opening the path to solution-processable laser diodes.

    • Namyoung Ahn
    • Clément Livache
    • Victor I. Klimov
    ResearchOpen Access
    Nature
    Volume: 617, P: 79-85

  • Nonradiative Auger recombination and poor stability of colloidal-quantum-dot solids at high current densities are primary obstacles to the realization of laser diodes based on these materials. Jung et al. achieve the current densities in excess of 1,000 A cm−2, which allows them to boost brightness to ~10 million cd m−2 and to produce strong, two-band optical gain.

    • Heeyoung Jung
    • Young-Shin Park
    • Victor I. Klimov
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-8

  • The grain boundaries in thin-film perovskite solar cells are responsible for non-radiative carrier recombination, which is deleterious for the optoelectronic performance. Son et al. show how to passivate the grain boundaries by using excess CH3NH3I in the precursor solution, achieving efficiencies of 20.4%.

    • Dae-Yong Son
    • Jin-Wook Lee
    • Nam-Gyu Park
    Research
    Nature Energy
    Volume: 1, P: 1-8

  • Colloidal quantum dots may offer solution-processable lasers, with a wide range of colours available. Technical hurdles and progress towards realization of useful quantum dot laser diodes is reviewed.

    • Heeyoung Jung
    • Namyoung Ahn
    • Victor I. Klimov
    Reviews
    Nature Photonics
    Volume: 15, P: 643-655