CASP Lecture

Quantum Chemistry of Quantum Dots

Jennifer Hollingsworth

Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Monday, May 10th, 10am

Chemistry Division Auditorium, TA-46, Bld. 535, Rm. 103

Abstract


Nanoscale semiconductor materials exhibit unique properties useful for energy-harvesting applications that contrast them with their respective bulk-phase counterparts, such as size-tunable band-gap energies for tuning the energy-onset of absorption, a concentration of the density of states into quantized energy levels resulting in high oscillator strengths for high absorptivities, and ultra-high surface-to-volume ratios. While much of the early work on the special properties of confined dimensionality has involved three-dimensionally (3D) confined nanoparticles (NPs), or quantum dots (QDs), 2D confined semiconductor nanowires (SC-NWs) can exhibit similar enabling characteristics. Furthermore, by virtue of their "wire-like" geometry, SC-NWs offer the additional advantage of providing a built-in conduit for charge transport-a key characteristic for applications in energy harvesting. SC-NWs can be fabricated using either vapor- or solution-phase methods, where solution-phase approaches offer advantages in lower-cost simplified processing and scale-up, as well as almost unlimited choice of materials systems from Group III-V to Groups IV, II-VI, IV-VI, and I-III-VI2 semi-conductors. Here, I will review aspects of the field of SC-NW synthesis, including a look at some future directions.