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A direct measurement of g-factors in II–VI and III–V core–shell nanocrystals |
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| Authors: | L Fradkin L Langof E Lifshitz N Gaponik A Rogach A Eychmüller H Weller OI Micic AJ Nozik |
| Institution: | aDepartment of Chemistry, Solid State Institute, Technion, Haifa 32000, Israel;bInstitute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany;cPhysics Department and CeNS, Ludwig-Maximilians-Universität München, 80799 Munich, Germany;dNational Renewable Energy Laboratory, Golden, CO 80401, USA |
| Abstract: | This study describes a direct measurement of spectroscopic g-factors of photo-generated carriers in InP/ZnS and HgTe/HgxCd1−xTe(S) core–shell nanocrystals. The g-factor of trapped electrons and their spin-lattice versus radiative relaxation ratio (T1/τ) were measured by the use of continuous-wave and time-resolved optically detected magnetic resonance (ODMR) spectroscopy. The g-factors of excitons and donor–hole pairs were derived by the use of field-induced circular-polarized photoluminescence (CP-PL) spectroscopy. The combined information enabled to determine the g-factors of the individual band-edge electrons and holes. The results suggested an increase of the g-factor of the exciton and conduction electron with a decrease of the nanocrystal size. |
| Keywords: | Colloidal quantum dots Core– shell nanocrystals g-factors ODMR |
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