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Impact of synthetic routes on the structural and physical properties of butyl-1,4-diammonium lead iodide semiconductors
KTH Royal Institute of Technology, Stockholm, Sweden .
Uppsala Univiversity, Uppsala, Sweden.
Uppsala Univiversity, Uppsala, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Process och Pharmaceuticals Development. KTH Royal Institute of Technology, Stockholm, Sweden . (Analys och fastfas)
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2017 (English)In: Journals of materials chemistry AArticle in journal (Refereed) Published
Abstract [en]

 We report the significant role of synthetic routes and the importance of     solvents in the synthesis of org.-inorg. lead iodide materials.  Through     one route, the intercalation of DMF in the crystal structure was obsd.     leading to a one--dimensional (1D) [NH3(CH2)4NH3]Pb2I6 structure of the     product.  This product was compared with the two-dimensional (2D)     [NH3(CH2)4NH3]PbI4 recovered from aq. solvent based synthesis with the     same precursors.  UV-visible absorption spectroscopy showed a red-shift of     0.1 eV for the band gap of the 1D network in relation to the 2D system.     This shift primarily originates from a shift in the valence band edge as     detd. from photoelectron- and X-ray spectroscopy results.  These findings     also suggest the iodide 5p orbital as the principal component in the d. of     states in the valence band edge.  Single crystal data show a change in the     local coordination around iodide, while in both materials, lead atoms are     surrounded by iodide atoms in octahedral units.  The cond. of the     one-dimensional material ([NH3(CH2)4NH3]Pb2I6) was 50% of the     two-dimensional material ([NH3(CH2)4NH3]PbI4).  The fabricated solar cells     reflect these changes in the chem. and electronic structure of both     materials, although the total light conversion efficiencies of solar cells based on both products were similar.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017.
Keyword [en]
lead iodide, synthesis, solar cells, photoelectron, crystal structure
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:ri:diva-28168DOI: 10.1039/c6ta10123bOAI: oai:DiVA.org:ri-28168DiVA: diva2:1073848
Available from: 2017-02-13 Created: 2017-02-13 Last updated: 2017-03-08Bibliographically approved

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CiteExportLink to record
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