Theoretical comparison of two-dimensional transient analysis between back and front laser treatment of thin multilayer films
✍ Scribed by Nicola Bianco; Oronzio Manca
- Book ID
- 104018786
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- French
- Weight
- 419 KB
- Volume
- 43
- Category
- Article
- ISSN
- 1290-0729
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✦ Synopsis
In this paper a comparison between two manufacturing processes is carried out by means of pulsed laser heat sources of thin film on substrate. The heat source can either impinge directly on the film surface (front treatment), or on the substrate (back treatment). A transient combined nonlinear optical-thermal model for pulsed laser sources on a thin film-glass substrate is proposed. The radiative field is considered to be locally one-dimensional and the transient conductive field two-dimensional. The investigation is carried out for a Nd-YAG laser with wavelength of 1064 nm impinging on an amorphous silicon (a-Si)/transparent conductive oxide SnO 2 (TCO) thin film deposited on a glass substrate. This is a step of the manufacturing process of amorphous silicon (a-Si) photovoltaic cells. Results in terms of radiative coefficients, temperature and absorption function distributions are presented in order to compare the two processes. The analysis shows that the highest values of absorptivity and temperature are obtained in the back treatment. Therefore this manufacturing process is more efficient for the production of photovoltaic cells.