Mark T. Swihart教授
美国纽约州立大学
时间: 6月28号（星期六）上午9点30分
地点: 唐仲英楼B501。
Abstract:
Colloidal semiconductor nanocrystals (NCs) are promising materials for use in solution-processed optoelectronic devices produced via low cost technologies including printing, blade-coating, and other roll-to-roll processes. Considering both the scale of global energy requirements and environmental impacts, colloidal nanocrystals composed of toxic heavy metals and/or rare elements cannot be the basis for energy technologies with long-term viability. Our group has recently been exploring semiconductor NCs based on earth-abundant elements including silicon, zinc oxide, copper sulfide/selenide, tin sulfide/selenide, copper/tin-sulfide/selenide and copper/zinc/tin-sulfide/selenide. We are also modifying currently well-developed materials by introducing non-toxic and earth-abundant elements to produce nanocrystals of materials such as lead/tin-sulfide/selenide. We further investigate the photophysical properties of thin films fabricated from these colloidal NC dispersions, including their photoresponse, conductivity and film stability, as a function not only of nanocrystal size and composition, but also post-treatment of the films. Several of these materials show substantial promise for use in optoelectronic devices including photovoltaics.