Filters

2019 - 201912020 - 20241

More filters

2020 - 20242
Reset filters

Settings

Subject: Direct synthesis ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Cation exchange synthesis of AgBiS2 quantum dots for highly efficient solar cells
    (Cambridge : RSC Publ., 2024) Senina, Alina; Prudnikau, Anatol; Wrzesińska-Lashkova, Angelika; Vaynzof, Yana; Paulus, Fabian
    Silver bismuth sulfide (AgBiS2) nanocrystals have emerged as a promising eco-friendly, low-cost solar cell absorber material. Their direct synthesis often relies on the hot-injection method, requiring the application of high temperatures and vacuum for prolonged times. Here, we demonstrate an alternative synthetic approach via a cation exchange reaction. In the first-step, bis(stearoyl)sulfide is used as an air-stable sulfur precursor for the synthesis of small, monodisperse Ag2S nanocrystals at room-temperature. In a second step, bismuth cations are incorporated into the nanocrystal lattice to form ternary AgBiS2 nanocrystals, without altering their size and shape. When implemented into photovoltaic devices, AgBiS2 nanocrystals obtained by cation exchange reach power conversion efficiencies of up to 7.35%, demonstrating the efficacy of the new synthetic approach for the formation of high-quality, ternary semiconducting nanocrystals.
  • Thumbnail Image
    Item
    Direct chemical vapor deposition synthesis of large area single-layer brominated graphene
    (Cambridge : Royal Society of Chemistry, 2019) Hasan, M.; Meiou, W.; Yulian, L.; Ullah, S.; Ta, H.Q.; Zhao, L.; Mendes, R.G.; Malik, Z.P.; Ahmad, N.M.; Liu, Z.; Rümmeli, M.H.
    Graphene and its derivatives such as functionalized graphene are considered to hold significant promise in numerous applications. Within that context, halogen functionalization is exciting for radical and nucleophilic substitution reactions as well as for the grafting of organic moieties. Historically, the successful covalent doping of sp2 carbon with halogens, such as bromine, was demonstrated with carbon nanotubes. However, the direct synthesis of brominated graphene has thus far remained elusive. In this study we show how large area brominated graphene with C-Br bonds can be achieved directly (i.e. a single step) using hydrogen rich low pressure chemical vapor deposition. The direct synthesis of brominated graphene could lead to practical developments. © The Royal Society of Chemistry.