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Sökning: WFRF:(Widmer Cooper Asaph)

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1.
  • Bassani, Carlos L., et al. (författare)
  • Nanocrystal Assemblies : Current Advances and Open Problems
  • 2024
  • Ingår i: ACS Nano. - 1936-0851. ; 18:23, s. 14791-14840
  • Forskningsöversikt (refereegranskat)abstract
    • We explore the potential of nanocrystals (a term used equivalently to nanoparticles) as building blocks for nanomaterials, and the current advances and open challenges for fundamental science developments and applications. Nanocrystal assemblies are inherently multiscale, and the generation of revolutionary material properties requires a precise understanding of the relationship between structure and function, the former being determined by classical effects and the latter often by quantum effects. With an emphasis on theory and computation, we discuss challenges that hamper current assembly strategies and to what extent nanocrystal assemblies represent thermodynamic equilibrium or kinetically trapped metastable states. We also examine dynamic effects and optimization of assembly protocols. Finally, we discuss promising material functions and examples of their realization with nanocrystal assemblies.
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2.
  • Shen, Xinyi, et al. (författare)
  • Chloride-Based Additive Engineering for Efficient and Stable Wide-Bandgap Perovskite Solar Cells
  • 2023
  • Ingår i: Advanced Materials. - 0935-9648. ; 35:30
  • Tidskriftsartikel (refereegranskat)abstract
    • Metal halide perovskite based tandem solar cells are promising to achieve power conversion efficiency beyond the theoretical limit of their single-junction counterparts. However, overcoming the significant open-circuit voltage deficit present in wide-bandgap perovskite solar cells remains a major hurdle for realizing efficient and stable perovskite tandem cells. Here, a holistic approach to overcoming challenges in 1.8 eV perovskite solar cells is reported by engineering the perovskite crystallization pathway by means of chloride additives. In conjunction with employing a self-assembled monolayer as the hole-transport layer, an open-circuit voltage of 1.25 V and a power conversion efficiency of 17.0% are achieved. The key role of methylammonium chloride addition is elucidated in facilitating the growth of a chloride-rich intermediate phase that directs crystallization of the desired cubic perovskite phase and induces more effective halide homogenization. The as-formed 1.8 eV perovskite demonstrates suppressed halide segregation and improved optoelectronic properties.
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