Says Alivisatos, "Our study shows that the superior performance of gold-tipped cadmium-selenide heterostructures results from a lower Schottky barrier and that solution grown contacts do not alter the chemical composition of the semiconductor. Further, our work demonstrates the increasing sophistication of high-quality electrical devices that can be achieved through self-assembly and verifies this process as an excellent route to the next generation of electronic and optoelectronic devices utilizing colloidal nanocrystals."
Adds Sheldon, "We believe our approach is an ideal strategy for making future devices from nanocrystals because it preserves the semiconductor character of the nanocrystal as synthesized with the precise control of their synthesis developed over the past decades."
Sheldon says the next step in this work will be to determine if the dramatic improvements in electrical behavior can translate to improvements in nanocrystal-based energy production. Initially, the group plans to investigate the use of solution grown contacts in photovoltaic applications.
|Contact: Lynn Yarris|
DOE/Lawrence Berkeley National Laboratory