Regular Arrays of QDs by Solution Processing
Oliva, Brittany L.
Barron, Andrew R.
Master of Science
Hydrophilic silicon and germanium quantum dots were synthesized by a "bottom-up" method utilizing micelles to control particle size. Liquid phase deposition of silica on these quantum dots was successful with and without DTAB (dodecyltrimethylammonium bromide) as a surfactant to yield uniform spheres. Coating the quantum dots in the presence of DTAB allowed for better size control. The silica coated quantum dots were then arrayed in three dimensions using a vertical deposition technique on quartz slides or ITO glass. UV-vis absorbance, AFM, SEM, and TEM images were used to analyze the particles at every stage. The photoconductivity of the arrays was tested, and the cells were found to be conductive in areas.
Applied sciences; Pure sciences; Physical chemistry; Nanoscience; Materials science