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• W2066703726 abstract "This study focuses on the correlation existing between the structure and the continuous dark conductivity in single crystals, compacted powders and thin films of the lithium phthalocyanine radical (PcLi). The dc conductivity at room temperature measured in PcLi compacted powders is of about 2–4·10−5 (Ω cm)−1 for the x structure and 1–2·10−4 (Ω cm)−1 for the α structure. The temperature dependence of the conductivity measured in the range 130–300 K hints at an activated-like behaviour with activation energies in the range 0.1–0.2 eV depending on the structure. PcLi thin films grow either in the x or the α structure depending on the substrate temperature (Ts) during deposition on the glass substrate. The conductivity shows a clear and strong dependence on the substrate temperature Ts and increases between 1·10−6 (Ω cm)−1 for Ts=25°C and 5·10−4 (Ω cm)−1 for Ts=200°C. Annealing of the PcLi thin films obtained for Ts=25°C at 200°C under vacuum results in a clear increase of the conductivity by more than one order of magnitude. The conductivity is independent on the presence of oxygen in powdered samples and single crystals, indicating the intrinsic nature of the semiconducting behaviour. Contrary to α-PcLi thin films (Ts∼200°C), the conductivity in PcLi x-form thin films (25°C<Ts<125°C) is sensitive to the presence of ambient atmosphere (σairσvac.∼2.3 at 300 K for Ts=24°C). This weak variation of the conductivity cannot be attributed to extrinsic charge carrier generation as observed for other metallophthalocyanines." @default.
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• W2066703726 date "1998-07-01" @default.
• W2066703726 modified "2023-10-16" @default.
• W2066703726 title "Dark conductivity in the x and alpha polymorphs of lithium phthalocyanine" @default.
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• W2066703726 doi "https://doi.org/10.1016/s0040-6090(97)01208-x" @default.
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