[Nature Photonics]Efficient photovoltage multiplication in carbon nanotubes

发布者:系统管理员发布时间:2011-11-10浏览次数:8034

篇名
Efficient photovoltage multiplication in carbon nanotubes
刊名
Nature Photonics
作者
DOI
10.1038/nphoton.2011.250
日期
2011-10-9
摘要
Carbon nanotubes are direct-bandgap materials that are not only useful for nanoelectronic applications, but also have the potential to make a significant impact on the next generation of photovoltaic technology. A semiconducting single-walled carbon nanotube (SWCNT) has an unusual band structure, as a result of which high-efficiency carrier multiplication effects have been predicted and observed and films of SWCNTs with absorption close to 100% have been reported. Other features that are also important for photovoltaic applications include high mobility and the availability of ohmic contacts for both electrons and holes. However, the photovoltage generated from a typical semiconducting SWCNT is less than 0.2V, which is too small for most practical photovoltaic applications. Here, we show that this value may be readily multiplied by using virtual contacts at the carbon nanotube. In one example, more than 1.0 V is generated from a 10-μm-long carbon nanotube with a single-cell photovoltage of ~0.2V.
供稿
龚翰墨

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