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Iodine induced 1-D lamellar self assembly in organic ionic crystals for solid state dye sensitized solar cells

Abstract : A novel saturated heterocyclic organic ionic crystal, piperidinium iodide (PiHI), is synthesized by a facile route and applied as a solid electrolyte in Dye Sensitized Solar Cells (ss-DSSCs). Upon addition of a small quantity of iodine, PiHI self-assembles into a 1D lamellar micro crystalline structure that shows anisotropic conductivity. The two-component PiHI was characterized by using electrochemical impedance spectroscopy, cyclic voltammetry, steady state voltammetry, FT-IR, and Raman spectroscopy. Wide angle X-ray diffraction (XRD) measurement confirms the presence of long range 1D lamellar channels that pave the way for the diffusion of the redox couple I−/I3− and exhibit high anisotropic conductivity. The ionic conductivity of 1D PiHI (with I2) aligned perpendicular to the electrode, σ⊥ (15.46 mS cm−1), is 1.5 times higher than that aligned parallel to the electrode σ∥ = 10.32 mS cm−1. The ss-DSSC devices with these self-assembled ordered ionic crystals with a carbazole based sensitizer (SK1) achieved a power conversion efficiency (PCE) of 4.2% and 5.2% for ∥al and ⊥ar arrangement, respectively. The reported PCEs are better than that obtained from a classical liquid electrolyte with SK1 sensitizers. The electron kinetics at various interfaces of ss-DSSC devices was evaluated using Electrochemical Impedance Spectroscopy (EIS) measurements. The presence of a saturated cyclic structure promotes close packing through H-bonding and electrostatic interactions, which make ss-DSSC devices more stable up to 600 h under illumination of 1 sun.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-01904923
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Soumis le : jeudi 25 octobre 2018 - 14:18:53
Dernière modification le : jeudi 9 juin 2022 - 10:15:19

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Jayraj Vaghasiya, Keval Soni, Thomas Beuvier, Alain Gibaud, Saurabh Soni. Iodine induced 1-D lamellar self assembly in organic ionic crystals for solid state dye sensitized solar cells. Nanoscale, Royal Society of Chemistry, 2017, 9 (41), pp.15949 - 15957. ⟨10.1039/C7NR06128E⟩. ⟨hal-01904923⟩

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