Microstructure evolution of polycrystalline silicon by molecular dynamics simulation

Polycrystalline silicon is the dominant material in solar cells and plays an important role in photovoltaic industry. It is important for not only the conventional production of silicon ingots but also the direct growth of silicon wafers to control crystallization for obtaining the desired polycryst...

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Bibliographic Details
Published in:AIP advances 2017-06, Vol.7 (6), p.065113-065113-7
Main Authors: Chen, Xiao, Ding, Jianning, Jiang, Cunhua, Liu, Zunfeng, Yuan, Ningyi
Format: Article
Language:English
Subjects:
Cooling rate
Crystallization
Diamonds
Dynamic structural analysis
Evolution
Extrusion
Microstructure
Molecular dynamics
Molecular structure
Photovoltaic cells
Planes
Polycrystals
Silicon
Silicon wafers
Simulation
Solar cells
Solidification
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Summary:Polycrystalline silicon is the dominant material in solar cells and plays an important role in photovoltaic industry. It is important for not only the conventional production of silicon ingots but also the direct growth of silicon wafers to control crystallization for obtaining the desired polycrystalline silicon. To the best of our knowledge, few studies have systematically reported about the effects of crystalline planes on the solidification behavior of liquid silicon and the analysis of the microstructural features of the polysilicon structure. In this study, molecular dynamics simulations were employed to investigate the solidification and microstructure evolution of polysilicon, with focus on the effects of the seed distribution and cooling rate on the growth of polycrystalline silicon. The (110), (111), and (112) planes were extruded by the (100) plane and formed the inclusion shape. The crystallization of silicon consisted of diamond-type structures is relatively high at a low cooling rate. The simulations provide substantial information regarding microstructures and serve as guidance for the growth of polycrystalline silicon.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4984234