We confirmed methyl termination on
n-Si(111) surface by ATR-FTIR measurement, which was fabricated by a photo
chloro-reaction and its methylation. The coverage of the methylation was about
63.7%, and the surface was not re-terminated by hydrogen. Photoelectrochemical properties of the n-Si(111) were measured as an electrode for a photoelectrochemical cell, and an onset
potential obtaining photocurrent for the methyl terminated n-Si(111) electrode
was observed as
negative shift at 70 mV comparing with that of the hydrogen terminated
n-Si(111) electrode. Therefore, the negative shift would be expected for
improving open circuit voltage towards solar cell.
References
[1]
K. L. Chopra, P. D. Paulson and V. Dutta, “Thin-Film Solar Cells: An Overview,” Progress in Photovoltaics, Vol. 12, No. 2-3, 2004, pp. 69-92. doi:10.1002/pip.541
[2]
A. Goetzberger, C. Hebling and H. W. Schock, “Photovoltaic Materials, History, Status and Outlook,” Materials Science and Engineering: R: Reports, Vol. 40, No. 1, 2003, pp. 1-46. doi:10.1016/S0927-796X(02)00092-X
[3]
M. R. Linford, and C. E. D. Chidsey, “Alkyl Monolayers Covalently Bonded to Silicon Surfaces,” Journal of the American Chemical Society, Vol. 115, No. 26, 1993, pp. 12631-12632. doi:10.1021/ja00079a071
[4]
M. R. Inford, P. Fenter, P. M. Eisenberger and C. E. D. Chidsey, “Alkyl Monolayers on Silicon Prepared from 1-Alkenes and Hydrogen-Terminated Silicon,” Journal of the American Chemical Society, Vol. 117, No. 11, 1995, pp. 3145-3155. doi:10.1021/ja00116a019
[5]
A. Bansal, X. L. Li, I. Lauermann, N. S. Lewis, S. I. Yi and W. H. Weinberg, “Alkylation of Si Surfaces Using a Two-Step Halogenation/Grignard Route,” Journal of the American Chemical Society, Vol. 118, No. 30, 1996, pp. 7225-7226. doi:10.1021/ja960348n
[6]
J. M. Buriak, “Organometallic Chemistry on Silicon Surfaces: Formation of Functional Monolayers Bound through Si-C Bonds,” Chemical Communications, No. 12, 1999, pp. 1051-1060. doi:10.1039/a900108e
[7]
J. M. Buriak, “Organometallic Chemistry on Silicon and Germanium Surfaces,” Chemical Reviews, Vol. 102, No. 5, 2002, pp. 1271-1308. doi:10.1021/cr000064s
[8]
D. D. M. Wayner, and R. A. Wolkow, “Organic Modification of Hydrogen Terminated Silicon Surfaces,” Journal of the Chemical Society, Perkin Transactions 2, No. 1, 2002, pp. 23-24.
[9]
T. Strother, W. Cai, X. S. Zhao, R. J. Hamers, and L. M. Smith, “Synthesis and Characterization of DNA-Modified Silicon (111) Surfaces,” Journal of the American Chemical Society, Vol. 122, No. 6, 2000, pp. 1205-1209.
doi:10.1021/ja9936161
[10]
A. Bansal, and N. S. Lewis, “Stabilization of Si Photoanodes in Aqueous Electrolytes through Surface Alkylation,” The Journal of Physical Chemistry B, Vol. 102, No. 21, 1998, pp. 4058-4060. doi:10.1021/jp980679h
[11]
W. J. Royea, A. Juang and N. S. Lewis, “Preparation of Air-Stable, Low Recombination Velocity Si(111) Surfaces Through Alkyl Termination,” Applied Physics Letters, Vol. 77, No. 13, 2000, pp. 1988-1990.
doi:10.1063/1.1312203
[12]
T. Okubo, H. Tsuchiya, M. Sadakata, T. Yasuda and K. Tanaka, “An Organic Functional Group Introduced to Si(111) via Silicon-Carbon Bond: A Liquid-Phase Approach,” Applied Physics Letters, Vol. 171, No. 3-4, 2001, pp. 252-256. doi:10.1016/S0169-4332(00)00759-5
[13]
R. L. Cicero, M. R. Linford and C. E. D. Chidsey, “Photoreactivity of Unsaturated Compounds with Hydrogen-erminated Silicon(111),” Langmuir, Vol. 16, No. 13, 2000, pp. 5688-5695. doi:10.1021/la9911990
