Presentation Type

Oral Presentation

Start Date

5-8-2024 9:00 AM

End Date

5-8-2024 11:00 AM

Subjects

Photocathodes

Advisor

Theresa McCormick

Student Level

Doctoral

Abstract

Contemporary dye-sensitized solar cells are far less efficient than silicon solar panels, therefore this project seeks to develop an improved dye sensitized photocathode. Tellurorhodamine dyes, including mesityl derivatives and tellurium black, have been chosen to increase efficiency through increased light harvesting. The photophysical and electrochemical properties of tellurorhodamines with varying structures are analyzed to quantify its efficiency to serve as a dye sensitized photo cathode. Dyes undergo aerobic oxidation facilitated by light, the absorption profile is obtained before and after. Mesityl derivatives are known to experience significant red-shifting following aerobic oxidation. At its base oxidation state, tellurium black experiences an even greater redshift than the oxidized mesityl derivative. Furthermore, mesityl derivatives reversibly undergo reduction and oxidation, as examined by cyclic voltammetry. Open circuit voltage demonstrates that the dye automatically oxidizes in the presence of light and then electronically reduces back in dark conditions. The effect of aerobic oxidation on the other tellurorhodamine derivatives is not known currently as they are still being investigated in this project.

Creative Commons License or Rights Statement

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Persistent Identifier

https://archives.pdx.edu/ds/psu/41942

Included in

Chemistry Commons

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May 8th, 9:00 AM May 8th, 11:00 AM

Photocathodes From Aerobic Oxidation of Tellurorhodamines

Contemporary dye-sensitized solar cells are far less efficient than silicon solar panels, therefore this project seeks to develop an improved dye sensitized photocathode. Tellurorhodamine dyes, including mesityl derivatives and tellurium black, have been chosen to increase efficiency through increased light harvesting. The photophysical and electrochemical properties of tellurorhodamines with varying structures are analyzed to quantify its efficiency to serve as a dye sensitized photo cathode. Dyes undergo aerobic oxidation facilitated by light, the absorption profile is obtained before and after. Mesityl derivatives are known to experience significant red-shifting following aerobic oxidation. At its base oxidation state, tellurium black experiences an even greater redshift than the oxidized mesityl derivative. Furthermore, mesityl derivatives reversibly undergo reduction and oxidation, as examined by cyclic voltammetry. Open circuit voltage demonstrates that the dye automatically oxidizes in the presence of light and then electronically reduces back in dark conditions. The effect of aerobic oxidation on the other tellurorhodamine derivatives is not known currently as they are still being investigated in this project.