Thin films of various organic materials have been deposited by Matrix Assisted Pulsed Laser Evaporation (MAPLE)
technique. The principles, advantages, and difficulties of deposition technology are discussed. The focus is on target
preparation, solvents, studied materials, growth rate and films properties characterization.
We report the obtaining of thin organic films based on poly(methyl methacrylate) polymer by Pulsed Laser Deposition on silicon substrates and quartz slides. The films were characterized by complementary techniques: x-ray Diffraction, x-ray Photoelectron Spectroscopy, Atomic Force Microscopy, Optical Microscopy, Raman Spectroscopy and Fourier Transform Infrared Spectroscopy. The obtained structures are amorphous. The film composition and structure depend on both the laser fluence as well as on the temperature of the substrate during deposition. We put in evidence in freshly deposited films the presence of diamond-like carbon while its amount strongly increases by annealing at ~400°C in Argon atmosphere.
Thin films deposited by pulsed laser deposition or reactive pulsed laser deposition are of interest in many key technological applications. However, the main shortcoming remains the presence on their surfaces and inside their volume of particles with various shapes and dimensions. We studied the possible formation and deposition mechanisms in different laser - target material - ambient gas configurations. Our experimental results as well as numerical simulations showed, that the origin of the particulates depends on the specific irradiation conditions, target and/or ambient gas nature and pressure. Therefore, the experimental conditions required for the decreasing of the particulates density or, if possible, for their complete elimination can be optimized for any particular case only. Nevertheless, a major conclusion of our investigations is that an important approach for the decrease of the particulates density, is to avoid the presence of liquid substance within the laser irradiation field.
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