Ultrafast Electronic Dynamics in Core-Shell Quantum Dots Probed with Dispersion-Free Broadband Two-Dimensional Electronic Spectroscopy

Quantum dots are gaining increasing interest in the last three decades, due to their unique optical and electronic properties intermediate between the bulk materials and single molecules.,They have a long list of potential applications including but not limited to solar cells and photovoltaics, LEDs, quantum computation, laser medium and medical imaging, because of their highly tunable properties.,In this dissertation, I prepared a series of monodispersed CdSe, CdSe/ZnS, CdSe/ZnS/CdSe quantum dots. Using the all-reflective dispersion-free broadband two dimensional electronic spectroscopy that we previously developed, I am able to probe the electronic dynamics of the first two excitons in these quantum dots at very early time. The ZnS shell influences the surface profile, and presents different relaxation dynamics in these core-shell quantum dots.