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We study how shape affects multiexciton generation (MEG) rates in asemiconducting nanocrystal by considering CdSe nanorods with varying diametersand aspect ratios. The calculations employ an atomistic semiempiricalpseudopotential model combined with an efficacious stochastic approach appliedto systems containing up to 20,000 atoms. The effect of nanorod diameter andaspect ratio on multiexciton generation rates is analyzed in terms of thescaling of the density of trion states and the scaling of the Coulombcouplings. Both show distinct scaling from spherical nanocrystals leading to asurprising result where the multiexciton generation rates are roughlyindependent of the nanorod aspect ratio

Biexciton generation rates in CdSe nanorods are length independent