Document Type

Honors Project

First Advisor

Ian McNeil

Second Advisor

Ellen Mitchell

Third Advisor

Kenneth Overway

Degree Award Date

Spring 2023

Keywords

Dye-sensitized solar cell, Electron diffusion, Acceptor states, Semiconductor, Electron transfer

Disciplines

Chemistry

Abstract

In this project, we are making dye-sensitized solar cells using titanium dioxide and the dye from raspberries. We are exploring how electrons diffuse through these systems. To do this, we perform cyclic chronopotentiometry where we cycle between periods of applying a voltage to achieve a certain current and periods where the current is stopped. We focus on the time-dependent decay of the voltage when the current is stopped and fit these decays with a bi-exponential model. We compare the results of devices with and without lithium perchlorate in the electrolyte solution since lithium lowers the energies of the acceptor states in the titanium dioxide film. We also are looking at the difference between 1 and 2 minute cycles to investigate potential hysteresis effects.

Recommended Citation

Hopson, Jasmine M.; McNeil, Ian J. "Using Cyclic-Step Chronopotentiometry to Explore Electron Mobility in Dye-Sensitized Solar Cells" Senior Honors Projects, Bridgewater College, 2023

Force Open Access

1

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