Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.

 

Selective Modulation of Charge-Carrier Transport of a Photoanode in a Photoelectrochemical Cell by a Graphitized Fullerene Interfacial Layer

(full pdf)

Sun-Young Park, Dr. Dong Chan Lim, Eun Mi Hong, Joo-Yeoul Lee, Jinhee Heo, Jae Hong Lim, Dr. Chang-Lyoul Lee, Prof. Young Dok Kim, Prof. Dr. Guido Mul
ChemSusChem
Vol. 8 Issue 1 nov.19, 2014
doi:10.1002/cssc.201402577

We show that a graphitic carbon interfacial layer, derived from C70 by annealing at 500 °C, results in a significant increase in the attainable photocurrent of a photoelectrochemical cell that contains a WO3-functionalized fluorine-doped tin oxide (FTO) photoanode. Time-resolved photoluminescence spectroscopy, photoconductive atomic force microscopy, Hall measurements, and electrochemical impedance spectroscopy show that the increase in photocurrent is the result of fast and selective electron transport from optically excited WO3 through the graphitic carbon interfacial layer to the FTO-coated glass electrode. Thus the energy efficiency of perspective solar-to-fuel devices can be improved by modification of the interface of semiconductors and conducting substrate electrodes by using graphitized fullerene derivatives.
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