|
Recent publications on this topic
Chen Lin, Ke Gong, David F. Kelley, and Anne Myers Kelley. Electron-phonon coupling in CdSe/CdS core/shell quantum dots. ACS Nano 9, 8131-8141 (2015).
Anne Myers Kelley. Comparison of three empirical force fields for phonon calculations in CdSe quantum dots. J. Chem. Phys. 144, 214702 (2016).
Ke Gong, David F. Kelley, and Anne Myers Kelley. Resonance Raman spectroscopy and electron-phonon coupling in zinc selenide quantum dots. J. Phys. Chem. C 120, 29533-29539 (2016).
Ke Gong, David F. Kelley, and Anne Myers Kelley. Non-uniform excitonic charge distribution enhances exciton-phonon coupling in ZnSe/CdSe alloyed quantum dots. J. Phys. Chem. Letters 8, 626-630 (2017).
Jamie J. Grenland, Chen Lin, Ke Gong, David F. Kelley, and Anne Myers Kelley. Resonance Raman investigation of the interaction between aromatic dithiocarbamate ligands and CdSe quantum dots. J. Phys. Chem. C 121, 7056-7061 (2017).
David Morgan, Ke Gong, Anne Myers Kelley, and David F. Kelley. Biexciton dynamics in alloy quantum dots. J. Phys. Chem. C 121, 18307-18316 (2017).
Jamie J. Grenland, Cassandra J. A. Maddux, David F. Kelley, and Anne Myers Kelley. Charge trapping versus exciton delocalization in CdSe quantum dots. J. Phys. Chem. Lett. 8, 5113-5118 (2017).
Ke Gong, David F. Kelley, and Anne Myers Kelley. Resonance Raman excitation profiles of CdS in pure CdS and CdSe/CdS core/shell quantum dots: CdS-localized excitons. J. Chem. Phys. 147, 224702 (2017).
Cassandra J. A. Maddux, David F. Kelley, and Anne Myers Kelley. Weak exciton-phonon coupling in CdSe nanoplatelets from quantitative resonance Raman intensity analysis. J. Phys. Chem. C 122, 27100-27106 (2018).
Anne Myers Kelley. Exciton-optical phonon coupling in II-VI semiconductor nanocrystals. J. Chem. Phys. 151, 140901 (2019).
Paul Cavanaugh, Ilan Jen-La Plante, Christian Ippen, Ruiqing Ma, David F. Kelley, and Anne Myers Kelley. Resonance Raman study of shell morphology in InP/ZnSe/ZnS core/shell/shell nanocrystals. J. Phys. Chem. C 19, 10549-10557 (2021).
Paul Cavanaugh, Haochen Sun, Ilan Jen-La Plante, Maria J. Bautista, Christian Ippen, Ruiqing Ma, Anne Myers Kelley, and David F. Kelley. Radiative dynamics and delayed emission in pure and doped InP/ZnSe/ZnS quantum dots. J. Chem. Phys. 155, 244705 (2021).
Anne Myers Kelley, Paul Cavanaugh, Haochen Sun, Xudong Wang, Maria J. Bautista, Ilan Jen-La Plante, Christian Ippen, and David F. Kelley. Identity of the reversible hole traps in InP/ZnSe core/shell quantum dots. J. Chem. Phys. 157, 174701 (2022). |
|
Exciton-phonon coupling and photophysics in semiconductor nanocrystals
The intensities of resonance Raman scattering, both relative intensities of different Raman transitions and the absolute scattering cross-sections, contain a wealth of information about the excited electronic states (electron-hole pairs or excitons in the case of semiconductor nanocrystals). We are using quantitative resonance Raman intensities to study exciton-phonon coupling (EPC), which refers to the change in the energy of an excitonic state as the nuclei move along a phonon coordinate. By quantitatively modeling the Raman intensities, we learn about EPC as well as the energies, transition dipole moments, and dephasing rates of the various resonant excitonic transitions. We work on the widely studied II-VI materials (e.g. CdSe, ZnSe, CdS) in both single-component and core-shell structures, as well as III-V compounds (InP). This work spans a range of techniques including nanocrystal synthesis and characterization, absorption and photoluminescence spectroscopy, resonance Raman spectroscopy, spectroscopic simulations using home-written codes, and density-functional theory calculations on small clusters. |
