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<p>Sublimable organic pigments, such as phthalocyanines, find wide application in thin-film electronic devices for solar energy conversion, current rectification, or gas sensing. The morphology, optical absorption, and conductivity of these films can be adjusted by setting the vacuum deposition conditions, primarily a substrate temperature. In this work, amorphous films of two model phthalocyanines (metal-free phthalocyanine H<sub>2</sub>Pc and its complex with manganese MnPc) were obtained by lowering the substrate temperature to 273 К during vacuum deposition without using a liquid nitrogen cooling facility. For paramagnetic MnPc molecules, the introduction of a weak permanent magnetic field into the growth zone makes the films denser, although they remain X-ray amorphous. Comparison with the samples grown at room and elevated temperatures reveals that the intermolecular interactions in MnPc films manifest themselves mainly in the 410–630&#xa0;nm range of the electronic absorption spectrum, i.e., between the Soret and Q bands. The spectra of H<sub>2</sub>Pc films are less dependent on deposition temperature and field-insensitive. The specific resistance of H<sub>2</sub>Pc films decreases with a lower substrate temperature, while MnPc films deposited under identical conditions become more resistive.</p>

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Growth of molecular films on a cooled substrate

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • A. I. Koptyaev,
  • V. V. Travkin,
  • P. A. Yunin,
  • K. M. Gordeev,
  • G. L. Pakhomov

摘要

Sublimable organic pigments, such as phthalocyanines, find wide application in thin-film electronic devices for solar energy conversion, current rectification, or gas sensing. The morphology, optical absorption, and conductivity of these films can be adjusted by setting the vacuum deposition conditions, primarily a substrate temperature. In this work, amorphous films of two model phthalocyanines (metal-free phthalocyanine H2Pc and its complex with manganese MnPc) were obtained by lowering the substrate temperature to 273 К during vacuum deposition without using a liquid nitrogen cooling facility. For paramagnetic MnPc molecules, the introduction of a weak permanent magnetic field into the growth zone makes the films denser, although they remain X-ray amorphous. Comparison with the samples grown at room and elevated temperatures reveals that the intermolecular interactions in MnPc films manifest themselves mainly in the 410–630 nm range of the electronic absorption spectrum, i.e., between the Soret and Q bands. The spectra of H2Pc films are less dependent on deposition temperature and field-insensitive. The specific resistance of H2Pc films decreases with a lower substrate temperature, while MnPc films deposited under identical conditions become more resistive.