Speaker
Description
A system for measuring Intensity Modulated Photovoltage Spectroscopy (IMVS) data on photoelectrodes was built utilizing a standard laboratory lock-in amplifier. IMVS measurement was performed on TiO2 thin film photoanodes under UV illumination to determine recombination time for electrons and holes, and charge transfer efficiency at the photoelectrode/electrolyte interface. Results from the lab-built device were compared with electrochemical impedance spectroscopy (EIS) data obtained using a commercial electrochemical analyzer, and are discussed with relation to the crystallinity, conductivity, and mobility of charge carriers within the thin films. Finally, the electronic transfer function for the lab-built system is shown to be constant in the frequency range of interest, from 1 Hz to 100 kHz.
| Academic year | 5th year and/or beyond |
|---|---|
| Research Advisor | Dr. Varghese |
