Surface structures, photovoltages, and stability of n-Si(111) electrodes surface modified with metal nanodots and various organic groups.
Surface structures, photovoltages, and stability of n-Si(111) electrodes surface modified with metal nanodots and various organic groups.
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DOI：
10.1021/la050423k
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发表时间：
2005-09
期刊：
影响因子：
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通讯作者：
Susumu Takabayashi;M. Ohashi;K. Mashima;Yang Liu;S. Yamazaki;Y. Nakato
中科院分区：
文献类型：
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作者：
Susumu Takabayashi;M. Ohashi;K. Mashima;Yang Liu;S. Yamazaki;Y. Nakato
在I-/I3-氧化还原电解液中，研究了Pt纳米点和有机基团修饰的n-Si（111）电极的表面结构、光电压和稳定性。首先用有机基团修饰n-Si，然后在其上电沉积Pt，线性扫描伏安法表明，对于烷基修饰，Pt沉积的过电压随着烷基链长的增加而明显增大，但对于具有双键和酯的烷基修饰，这并不一定成立。扫描电镜观察表明，随着烷基链长度的增加，Pt颗粒密度减小，颗粒尺寸增大。有机基团修饰的n-Si电极的光伏特性和稳定性大大提高了Pt纳米点涂层，虽然他们变得有些逊色与增加烷基链的长度。在这些结果的基础上，可以得出结论，在高覆盖率的表面烷基化与小Pt纳米点的涂层一起提供了有效和稳定的n-Si电极。
The surface structures, photovoltages, and stability of n-Si(111) electrodes surface-modified with Pt nanodots and organic groups were studied in an I-/I3- redox electrolyte, using alkyls of varied chain length and those having a double bond and ester at the terminal as the organic groups. The n-Si was first modified with the organic groups, and then Pt was electrodeposited on it. Linear sweep voltammetry revealed that, for the modification with alkyls, the overvoltage for the Pt deposition became significantly larger with increasing alkyl chain length, though this does not necessarily hold for the modification with alkyls having a double bond and ester. Scanning electron microscopic inspection showed that the Pt particle density decreased and the particle size increased, with increasing alkyl chain length. The photovoltaic characteristics and stability for the n-Si electrodes modified with the organic groups were much improved by the Pt nanodot coating, though they became somewhat inferior with increasing alkyl chain length. On the basis of these results, it is concluded that surface alkylation at high coverage together with coating with small Pt nanodots gives efficient and stable n-Si electrodes.