The II-VI semiconductors find use in applications ranging from laser diodes to thin film display logic. Colloidal nanocrystals have recently been used to fabricated high performance II-VI semiconductor solids, providing a route to low-cost large-area electronics. It remains an open question if the nanocrystals can form a conductive solid while maintaining their quantum confined optical properties. This talk will demonstrate a close correlation between sintering and the onset of conductivity in cadmium selenide. Pair distribution function analysis of powder X-ray diffraction further shows that sintering occurs at temperatures as low as 150 °C. Additionally, we find that halides reduce the temperature necessary to induce crystallization of large Wurtzite grains from Zinc Blende nanocrystals from above 300 °C to below 200 °C. Details of the phase transition will be explored.

Grain structure and transport in nanocrystalline cadmium selenide

249th National Meeting (2015)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.