Dye Sensitized Solar Cells with an Applied Bias Research by: Josh Bollinger With Dr. McNeil

Remember: What is a DSSC? Dye-from Raspberries Anthocyanin Working Electrode Titanium Oxide (TiO2) Counter Electrode Carbon Layer (Soot) Electrolyte Solution Iodide Triiodide (I-/I3) Electron relaxes by: Emitting a photon Relaxing back to HOMO Injecting to Conduction band of TiO2

Conduction Band: “Charging Up” Effect Density of States Energy Current Increases over time Caused by: Impurities in the TiO2 Conduction Band layer. Exponential Distribution of Trap States

Previous Research My Research Density of States Energy Previously: Use of Lithium in Ethylene Glycol Electrolyte Kinetically Drives electron injection My Research: Using a Potentiostat to Apply a Voltage Lithiu

My Research Energy Density of States Filling up to fermi level from bottom What I expect to see Many variables to consider Fermi Level

Qualitative Graph Comparison Firehose Effect

Fitting the Data Logistic and Generalized Logistic Growth Functions Current Current Logistic Parameters: K --- Maximum Current P0 --- Initial Current R --- Rate (1/s) Generalized Logistic Parameters K --- Maximum Current A --- Initial Current Q --- Related to M B --- Rate (1/s) M --- Time at the Inflection Point ν --- Related to Q and M

Logistic/Generalized Logistic Qualitative Fit

Future Direction Multiple Voltages: Ex. -0.125 V Lithium concentrations with multiple voltages Combining Miesca’s research with current direction Try different electrolyte solutions Instead of Ethylene Glycol use Acetonitrile