Electron Injection Dynamics in Dye-Sensitized Solar Cells

Literature seminar abstract

Dye-sensitized solar cells (DCCS) are a promising, inexpensive alternative to conventional p-n junction solar cells.  The process of electron injection from the dye to semiconductor interface is a determinant for the efficiency of DSSCs, and yet, the full mechanism is poorly understood.  Previous kinetic studies on electron injection suggest this process happens on a time scale ranging from femto- to nanoseconds.  This wide temporal range makes it difficult to deduce an underlying mechanism.  In this study [1], transient absorption spectroscopy is used to investigate the kinetics of electron injection at the interface between a series of Ruthenium(II)-polypyridyl based dyes anchored onto a nanocrystalline TiO2 semiconductor. Experimental results are interpreted using Marcus-Gerisher theory and a model describing the underlying mechanism for electron injection is proposed.

 

 

[1]           D. F. Zigler et al., “Disentangling the Physical Processes Responsible for the Kinetic Complexity in Interfacial Electron Transfer of Excited Ru(II) Polypyridyl Dyes on TiO2,” J. Am. Chem. Soc. 2016, 138, 4426–4438

 

Division(s): Physical

Speaker: Yusef Farah

Speaker Institution: Colorado State University

Event Date: 11-02-2017

Event Time: 4:00 PM

Event Location: Chemistry A101

Mixer Time: 3:45 PM

Mixer Location: Chemistry B101E

Host: A. Krummel