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

2. 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

3. 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

4. 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

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

6. Qualitative Graph Comparison
Firehose Effect

7. Fitting the Data Logistic and Generalized Logistic Growth Functions
Current
Current
Logistic Parameters:
K Maximum Current
P 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

8. Logistic/Generalized Logistic Qualitative Fit

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