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Abstract <p>Thin films of tin(II) phthalocyanine (SnPc) were thermally evaporated in vacuum onto substrates at different temperatures (<i>T</i><sub>g</sub>). Their transmission spectra in the UV, visible, and near-IR ranges were measured. A 100 nm thick SnPc film was found to become an almost panchromatic photoabsorber: the “green gap” characteristic of porphyrinoids narrowed to the range 410–490 nm, and the long-wavelength edge of the <i>Q</i> band extended to 1100–1200 nm, depending on the growth conditions. At <i>T</i><sub>g</sub> below room temperature, the films were X-ray amorphous, and at <i>T</i><sub>g</sub> &gt; 25°C, the triclinic polymorph accumulated. The structure of the films was always granular, but the size, shape, and packing of grains strongly depended on <i>T</i><sub>g</sub>. The specific conductivity of SnPc thin films was measured in the dark and under continuous white light (solar simulator) or filtered near-infrared light. For SnPc films grown at elevated <i>T</i><sub>g</sub>, the photo-to-dark current ratio exceeded an order of magnitude under residual illumination at wavelengths longer than 1 µm.</p>

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Optical Spectra, Morphology, and Photoconductivity of SnPc Thin Films Deposited at Different Temperatures

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • V. V. Travkin,
  • A. I. Koptyaev,
  • A. Yu. Luk’yanov,
  • G. L. Pakhomov

摘要

Abstract

Thin films of tin(II) phthalocyanine (SnPc) were thermally evaporated in vacuum onto substrates at different temperatures (Tg). Their transmission spectra in the UV, visible, and near-IR ranges were measured. A 100 nm thick SnPc film was found to become an almost panchromatic photoabsorber: the “green gap” characteristic of porphyrinoids narrowed to the range 410–490 nm, and the long-wavelength edge of the Q band extended to 1100–1200 nm, depending on the growth conditions. At Tg below room temperature, the films were X-ray amorphous, and at Tg > 25°C, the triclinic polymorph accumulated. The structure of the films was always granular, but the size, shape, and packing of grains strongly depended on Tg. The specific conductivity of SnPc thin films was measured in the dark and under continuous white light (solar simulator) or filtered near-infrared light. For SnPc films grown at elevated Tg, the photo-to-dark current ratio exceeded an order of magnitude under residual illumination at wavelengths longer than 1 µm.