Fabrication of Anisotropic Structures on the Surface of Amorphous Silicon by Femtosecond Laser Pulses
| Autor: | S. V. Zabotnov, Denis E. Presnov, M. N. Martyshov, Danila V. Orlov, Andrei G. Kazanskii, Pavel K. Kashkarov, D. V. Shuleiko |
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| Rok vydání: | 2020 |
| Předmět: |
Amorphous silicon
Surface (mathematics) Materials science Fabrication business.industry Electrical anisotropy 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Laser 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics chemistry.chemical_compound chemistry law 0103 physical sciences Femtosecond Optoelectronics General Materials Science Silicon nanocrystals 0210 nano-technology business Anisotropy |
| Zdroj: | Solid State Phenomena. 312:192-199 |
| ISSN: | 1662-9779 |
| Popis: | Anisotropic periodic relief in form of ripples was formed on surface of amorphous hydrogenated silicon (a-Si:H) films by femtosecond laser pulses with the wavelength of 1.25 μm. The orientation of the surface structures relative to laser radiation polarization vector depended on the number of laser pulses N acting on the film surface. When N = 30, the structures with 0.88 μm period were formed orthogonal to the laser radiation polarization; at N = 750 the surface structures had period of 1.12 μm and direction parallel to the polarization. The conductivity of the laser-modified a-Si:H films increased by 3 to 4 orders of magnitude, up to 3.8·10–5 (Ω∙cm)–1, due to formation of nanocrystalline Si phase with a volume fraction from 17 to 30%. Anisotropy of the dark conductivity, as well as anisotropy of the photoconductivity spectral dependences was observed in the modified films due to depolarizing influence of periodic microscale relief and uneven distribution of nanocrystalline Si phase within such laser-induced structure. |
| Databáze: | OpenAIRE |
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