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Polyiodide Hybrid Perovskites: A strategy to convert intrinsic 2D systems into 3D photovoltaic materials
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation. KTH Royal Institute of Technology, Sweden.
2019 (English)In: ACS Applied Energy Materials, ISSN 2574-0962, Vol. 2, no 1, p. 477-485Article in journal (Refereed) Published
Abstract [en]

Two new organic–inorganic hybrid perovskite compounds, (Me3S)2Pb5I14*2I2 (1) and (C8H11S)2Pb2I6*I2 (2), have been synthesized and subsequently characterized in this study. The materials were synthesized from facile one-pot, one-step reactions of lead iodide, corresponding sulfide, methanol, iodine, and hydroiodic acid in the case of 2. Structural analysis reveals the presence of polyiodide entities in both compounds. Compound 1 contains triiodide anions, I3, that are uniquely shared between the 2D inorganic slabs, forming a 3D network. Both 1 and 2 have I2 molecules that are bridging the inorganic slabs through a structural motif that can be regarded as a tetraiodide anion, I42–. Optical spectroscopy shows band gaps of 1.86 eV for 1 and 1.89 eV for 2. The optoelectronic properties were further investigated with band structure calculations. Single-crystal IV-characteristics of 1 show that the compound is photoactive confirming it as a promising photovoltaic candidate. Compound 1 highlights a novel strategy of designing 3D semiconducting hybrid materials by incorporating polyiodides to provide direct geometric and electronic connections between the semiconducting inorganic perovskite sheets.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 2, no 1, p. 477-485
Keywords [en]
organic inorganic hybrid materials, perovskites, polyiodide, solar cells, iodine
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:ri:diva-36987DOI: 10.1021/acsaem.8b01507OAI: oai:DiVA.org:ri-36987DiVA, id: diva2:1276427
Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-07-01Bibliographically approved

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