Product Code: PIC2008_M1204

Improving Optical Transmittance of Double Walled Carbon Nanotube Film by Laser Processing
Authors:
Tao Gong, Tsinghua University, Dept of Mechanical Engineering; Beijing Peoples Republic of China
Yong Zhang, Tsinghua University, Dept of Mechanical Engineering; Beijing Peoples Republic of China
Minlin Zhong, Tsinghua University; Beijing Peoples Republic of China
Wenjin Liu, Tsinghua University, Dept of Mechanical Engineering; Beijing Peoples Republic of China
Yi Jia, Tsinghua University; Beijing Peoples Republic of China
Chaofeng Wu, Tsinghua University; Beijing Peoples Republic of China
Kunlin Wang, Tsinghua University; Beijing Peoples Republic of China
Jinquan Wei, Tsinghua University; Beijing Peoples Republic of China
Mingxing Ma, Tsinghua University; Beijing Peoples Republic of China
Dehai Wu, Tsinghua University; Beijing Peoples Republic of China
Presented at PICALO 2008

Recently the solar cell becomes more and more attractive due to the exhaust of the fossil fuel. As a new method, transparent double-walled carbon nanotubes (DWNTs) thin film and n-Si substrate are assembled to be a solar cell which shows a better performance than the organic polymer cells. To further improve the performance of the DWNT solar cell, laser treating is introduced. As a result, the CO2 laser treatment makes the solar cell a more excellent performance, e.g. higher filling factor and conversion efficiency. The DWNTs before and after laser treatment are respectively investigated by Raman spectroscopy, scanning electronic microscopy and transmission electronic microscopy, which show that the nanotube networks in the film are connected or wrapped by amorphous carbon and the crystallization of the nanotube becomes worse after laser treatment. The resistivity of the film is consequently increased. However, the resistance of the p-n junction is decreased by laser treatment, indicating that better contact forms between the DWNT film and the n-Si substrate. The combination of these effects gives the solar cell a larger short circuit current and finally resulted in a better performance.

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