To incorporate the CNTs in thin film solar cells, band gap matters. It will be highly appreciated if someone can refer a paper having discussion on energy levels of CNTs.
Please see the answers below:
https://www.researchgate.net/post/What_could_be_the_band_gap_of_multi_walled_carbon_nanotubes
Single walled nanotubes can be metallic or semiconducting, and the band gap of the latter depends on chirality.
Here is a starting point
https://en.wikipedia.org/wiki/Optical_properties_of_carbon_nanotubes
Article Optical properties of single-wall carbon nanotubes
Hugh J Byrne already posted the Kataura plot which gives the theoretical n-m-bandgap relation. There is also an empiric refinement to that work:
Article Dependence of Optical Transition Energies on Structure for S...
I think it is difficult to use carbon nano tube for solar cell because it's band gap fall between(0.8-1 eV) that mean in near IR region
Isam M. Ibrahim : the usage of CNTs for solar cells is actually a highly investigated topic, see e.g.
Article The Role of Nanotubes in Carbon Nanotube–Silicon Solar Cells
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