Fourier-transform infrared spectroscopic studies of pristine polysilanes as precursor molecules for the solution deposition of amorphous silicon thin-films

详细信息    查看全文

• 作者：Soo Kim ; Chun-Young Lee ; Michael H.-C. Jin ; ^mjin@uta.edu
• 关键词：Amorphous silicon ; Thin film ; Solution process ; Polysilane ; Solar cell ; Precursor
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 出版时间：May, 2012
• 年：2012
• 卷：100
• 期：Complete
• 页码：61-64
• 全文大小：439 K

文摘

Pristine polysilane containing only Si and H is considered as a potential precursor material that allows the solution-based deposition of hydrogenated amorphous Si (a-Si:H) thin-films reducing manufacturing cost of Si thin-film photovoltaic devices. This study explored three different synthetic routes including W¨¹rtz-type reductive coupling reaction, hydrogenation of Si anionic compound, and the dehydrocoupling reaction in order to realize the soluble polysilane molecules. While W¨¹rtz-type reaction of diiodosilane presented us a direct synthetic scheme for hydrogenated polysilane, the results indicated that an extremely controlled air-free system for the synthesis and sample handling would be necessary to prevent the formation of siloxane bonds from the spontaneous reaction between silane-based molecules and water in the air. While the hydrogenation of CaSi₂ and the dehydrocoupling reaction of phenylsilane provided more stable forms of polysilane, dissolution of the polysilane from CaSi₂ in dichlorobenzene was not successful possibly due to its layered structure succeeded from CaSi₂ and the removal of the phenyl groups from the synthesized polyphenylsilane remains as a challenge to realize the polysilane precursor necessary for the solution-based thin-film process of a-Si:H.