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Showing 1–6 of 6 results
Advanced filters: Author: Lakshminarayana Polavarapu Clear advanced filters

  • The effects of the combined interplay of below-band-gap multi-photon absorption and multiple exciton generation have not been investigated. Here, the authors show the combined interaction of these processes in perovskite nanocrystals, leading to an enhanced interband photoluminescence emission under resonant conditions.

    • Aurora Manzi
    • Yu Tong
    • Jochen Feldmann
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-6

  • Using a combination of femtosecond pump-probe spectroscopy and first-principles calculations, Debnath et al. elucidated the halide-dependence of the excited state vibrational coherences in hybrid organic-inorganic perovskite nanocrystals. The study revealed an intrinsic anharmonicity of lead-halide framework, which correlates with perovskite stability and is influenced by the interaction between the framework and the organic molecules.

    • Tushar Debnath
    • Debalaya Sarker
    • Jochen Feldmann
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-9

  • Perovskite solar cells must overcome the long-term stability problem in order to be put into practical use. Materials science, through the development of synthetic chemistry, materials characterization and device engineering can contribute to improvements in stability and scalability towards enabling large scale production. This Collection presents recent research efforts in stabilizing perovskite solar cells with three interconnected themes: characterizing instability, synthesizing stable perovskites and curing the interfaces.

    • Shuxia Tao
    • Lakshminarayana Polavarapu
    • Paola Vivo
    EditorialOpen Access
    Scientific Reports
    Volume: 13, P: 1-3

  • This review summarizes recent developments in the direct synthesis and ion exchange-based reactions leading to hybrid organic–inorganic and all-inorganic lead halide perovskite nanocrystals. Optical properties related to quantum confinement effects, single emission spectroscopy and lasing are considered. Perovskite nanocrystals have been employed as an active material in several applications such as light-emitting devices, solar cells and photodetectors.

    • He Huang
    • Lakshminarayana Polavarapu
    • Andrey L Rogach
    ReviewsOpen Access
    NPG Asia Materials
    Volume: 8, P: e328