1 Ocak 2022 Dergi makalesi Açık Erişim

Guvenc, C. Meric; Tunc, Ilknur; Balci, Sinan

JSON-LD (schema.org)

{
  "@context": "https://schema.org/", 
  "@id": 231946, 
  "@type": "ScholarlyArticle", 
  "creator": [
    {
      "@type": "Person", 
      "affiliation": "Izmir Inst Technol, Dept Mat Sci & Engn, TR-35430 Izmir, Turkey", 
      "name": "Guvenc, C. Meric"
    }, 
    {
      "@type": "Person", 
      "affiliation": "Univ Turkish Aeronaut Assoc, Dept Mech Engn, TR-06790 Ankara, Turkey", 
      "name": "Tunc, Ilknur"
    }, 
    {
      "@type": "Person", 
      "affiliation": "Izmir Inst Technol, Dept Photon, TR-35430 Izmir, Turkey", 
      "name": "Balci, Sinan"
    }
  ], 
  "datePublished": "2022-01-01", 
  "description": "The main challenges to overcome for colloidal 2D Ruddlesden-Popper (RP) organo-lead iodide perovskite nanocrystals (NCs) are phase instability and low photo-luminescence quantum yield (PLQY). Herein, we demonstrate colloidal synthesis of guanidinium (GA)-L-2[GAPbI(3)]PbI4, formamidinium (FA)-L-2[FAPbI(3)]PbI4, and GA and FA alloyed L-2[GA(0.5)FA(0.5)PbI(3)]PbI4 NCs without using polar or high boiling point nonpolar solvents. Importantly, we show that optical properties and phase stability of L-2[APbI(3)]PbI4 NCs can be affectively tuned by alloying with guanidinium and formamidinium cations. Additionally, the band gap of NCs can be rapidly engineered by bromide ion exchange in L-2[GA(x)FA(1-x)PbI(3)]PbI4 (0 = x = 1) NCs. Our approach produces a stable dispersion of L-2[FAPbI(3)]PbI4 NCs with 12.6% PLQY that is at least three times higher than the previously reported PLQY in the nanocrystals. Furthermore, L-2[GAPbI(3)]PbI4 and L-2[GA(0.5)FA(0.5)PbI(3)]PbI4 NC films exhibit improved ambient stability over 10 days, which is significantly higher than L-2[FAPbI(3)]PbI4 NC films, which transform to an undesired 1D phase within 6 days. The colloidally synthesized guanidinium- and formamidinium-based 2D RP organo-lead iodide perovskite NCs with improved stability and high PLQY demonstrated in this study may find applications in solar cells and light-emitting diodes. Therefore, large A-site cation-alloyed 2D RP perovskite NCs may provide a new way to rationalize high-performance and stable perovskite solar cells and light-emitting diodes.", 
  "headline": "L-2[GA(x)FA(1-x)PbI(3)]PbI4 (0 <= x <= 1) Ruddlesden-Popper Perovskite Nanocrystals for Solar Cells and Light-Emitting Diodes", 
  "identifier": 231946, 
  "image": "https://aperta.ulakbim.gov.tr/static/img/logo/aperta_logo_with_icon.svg", 
  "license": "http://www.opendefinition.org/licenses/cc-by", 
  "name": "L-2[GA(x)FA(1-x)PbI(3)]PbI4 (0 <= x <= 1) Ruddlesden-Popper Perovskite Nanocrystals for Solar Cells and Light-Emitting Diodes", 
  "url": "https://aperta.ulakbim.gov.tr/record/231946"
}