Carrier Generation Ability of CNTs to Harvest Maximum Energy from Solar Spectrum

With outstanding transport and optical capabilities, thin film networks of highly pure semiconducting carbon nanotubes (CNTs) are being investigated for use in energy harvesting and optoelectronic devices. Although the pathways and methods for charge generation remain mostly unknown, the proximity of the nanotubes in this model allows energy to flow across the solar cell. Here, we acquire light spectra in two dimensions at femtosecond time scales using a broadband continuum. Bandgap (S1) and higher (S2) transition energy can be resolved across the wide range of 400-1500 nm continuum. Article discussed about anti-correlated energy states, rapid energy redistribution between S2 states, and non-forster charge transfer between S1 states. The charge generation taken by S2 excitons vary with the bandgap, as seen in the two-dimensional spectra. When the chirality of CNTs is changed charge generation rate vary in different spectrum of solar light. Using SWCNT samples of varying thickness, this study analyzes the charge generation characteristics of carbon nanotubes. A carbon nanotube is found to have a carbon absorption coefficient greater than 24 x 10
⁴
cm
^-1
.