Quantum Confinement Regimes in CdTe Nanocrystals Probed by Single Dot Spectroscopy : From Strong Confinement to the Bulk Limit

Sufficiently large semiconductor nanocrystals are a useful model system to characterize bulk-like excitons, with the electron and hole bound predominantly by Coulomb interaction. We present optical characterization of excitons in individual giant CdTe nanocrystals with diameters up to 25.5 nm at 4.2 K under varying excitation power and magnetic field strength. We determine values for the biexciton binding energy, diamagnetic shift constant, and Lande g-factor, which approach the bulk values with increasing nanocrystal size.