Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Colloidal semiconductor nanocrystals or quantum dots (QDs) exhibit a size tunable emission spectrum in combination with broad absorption and excitation spectra. These characteristics make QDs of significant interest in optoelectronics. The InP QD platform is relatively new and the electronic structure and optical properties have to be investigated in more detail.
A powerful method to investigate the electronic states and unravel the exciton fine-structure of InP QDs is optical spectroscopy under high magnetic fields and low temperature [1-4]. We studied the exciton fine-structure and the role of phonons in InP core/shell QDs system with various shells, with this method. The high magnetic field allowed us to obtain a considerable Zeeman splitting of spin degenerate states. Combined with detection of the polarization of the emitted photons, the nature of the states could be resolved. Hence, we detected bright and dark exciton states and the dynamic role of phonons in light emission.
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