Date: Tuesday, October 1, 2013
Time: 11:00 am
Speaker: Mikhail Zamkov, Bowling Green State University
Title: Engineering of Semiconductor Nanocrystals & Nanocrystal Solids for Renewable Energy Applications
Location: 67-3111 Chemla room
I will discuss a novel methodology for depositing colloidal semiconductor nanocrystals into all-inorganic solid films with implications both to nanocrystal solar cells and nanocrystal light-emitting devices. The reported strategy utilizes a simple scheme for incorporating PbS or CdSe semiconductor nanocrystals into matrices of a wide-band gap CdS semiconductor for stable and efficient operation of solution-processed devices. The two key benefits of this approach include: (i) all-inorganic architecture promoting superior thermal and chemical stability, and - (ii) a unique film morphology, which offers the possibility of tuning the film properties between conducting (for applications in solar cells) and light-emitting (LEDs, lasers) simply by changing the interparticle distance in the matrix. This approach is universal and can be extended to a large number of nanocrystal/matrix combinations. The second part of the presentation will focus on ultrafast electron processes taking place in photocatalytically active metal-semiconductor nanocrystals. In particular, the key factors affecting the photocatalytic performance of semiconductor nanocrystals will be reviewed.