We have achieved a simple fabrication of heterojunction solar cells<br>from single-walled carbon nanotubes (SWCNTs) and n-type silicon<br>wafer. The patterned silicon substrate was prepared via a simple wetetching process by dropping hydrofuric acid over a hand-made physical<br>mask. Power-conversion efficiency value of 4.3% and fill factor of 0.67<br>are obtained from the nanotube film with the mean nanotube diameter<br>of about 1.1 nm without any post-treatment process, while the transparency of the nanotube film prepared by vacuum filtration is 70%. In future work, the fabrication of heterojunction solar cells using other types<br>of nanomaterials could be explored along with possibility of fabricating<br>flexible solar cells with thin film silicon. A simple fabrication of<br>heterojunction solar cells by wet-etching process could be performed<br>with good power-conversion efficiency, although silicon is employed<br>in the process. The use of wet-etching process has given potential for future research and development
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