Estimation of Thermal Conductivity of Amorphous Silicon Thin Films from the Optical Reflectivity Measurement
- Title
- Estimation of Thermal Conductivity of Amorphous Silicon Thin Films from the Optical Reflectivity Measurement
- Author
- 문승재
- Keywords
- Amorphous silicon; Heat conduction; Optical properties; Reflectivity; Thermal conductivity
- Issue Date
- 2013-09
- Publisher
- American Scientific Publishers
- Citation
- Journal of Nanoscience and Nanotechnology, 2013, 13(9), P.6362-6366
- Abstract
- Amorphous silicon (a-Si) thin film material is widely used in liquid crystal display and solar cell applications. Knowledge of its properties is important in enhancing device performance. The properties of a-Si thin film have not been well understood due to the lack of periodicity of the structure. Furthermore, thermal conductivity of a-Si thin film is a key parameter to understand the complex phase transformation mechanism from a-Si thin film to polysilicon thin film by analyzing the transient temperature during the laser recrystallization process. In this work, thermal conductivity of a-Si thin film was determined by measuring optical reflectivity. A-Si thin film was irradiated with a KrF excimer laser beam to raise its temperature. The raised film temperature affects temperature-dependent optical properties such as refractive indices and extinction coefficients. The temperature-dependent optical properties of refractive indices and extinction coefficients of a-Si thin film were measured by ellipsometry. In-situ transient reflectivity at the wavelength of 633 nm was obtained during the excimer laser irradiation. The numerical simulation of one-dimensional conduction equation was solved so that transient reflectivities were calculated with temperature-dependent optical properties combined with thin film optics. Therefore, a well-fitted thermal conductivity was determined by comparing the numerically obtained transient reflectivity with the experimentally measured reflectivity data. The determined thermal conductivity of a-Si thin films was 1.5 W/mK.
- URI
- http://www.ingentaconnect.com/content/asp/jnn/2013/00000013/00000009/art00081
- ISSN
- 1533-4880; 1533-4899
- DOI
- 10.1166/jnn.2013.7712
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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