Sohee Jeong1
Sungkyunkwan University1
In the last 30 years, inorganic semiconductor nanocrystals have been extensively researched because of their size-dependent optoelectronic properties, thus successfully debuting in the commercial sector. The synthetic development of nanocrystals, however, has perplexed from the complex energy landscape of the reaction. Unlike intermediates that can be isolated and characterized with atomic precision in organic synthesis, the intermediates in nanocrystal synthesis are difficult to resolve because of the co-existence of metastable states with similar energy. If one can control the energy of the metastable intermediates originating from various factors including shapes and surface-ligand interaction and isolate the singular intermediate species, the nanocrystal growth with atomic precision could be achievable. <br/> <br/>In this presentation, I will briefly discuss the tetrapod InAs nanocrystals as a crystalline “late intermediate” that warrants controlled colloidal nanocrystal growth. The use of the late intermediate with well-defined facets at the sub-10 nm scale for directional growth with atomic control and highlight the potential for the new directed approach of nanocrystal synthesis. Secondly, a route of synthesizing highly mono-dispersed InAs colloidal quantum dots in wide size-range by introducing chemical reactivity-controlled “early intermediate” InAs nanoclusters will be presented. Finally, n- and p- doping polarity tuned InAs quantum dot film based optoelectronic device characteristics will be discussed.