Many of the properties relevant to solar energy conversion in a liquid-semiconductor-liquid cell are not understood. The goal of this project is to study how the back contact affects the cell voltage. A thin layer cell with H-terminated n-type silicon as the semiconductor was used along with various redox couples. We found a 1:1 linear slope when the potential energy of the redox couples was compared to the open circuit voltage. This shows the back contact is ohmic so the contact does not limit the current flow. The linear slope also indicates the contact is ideal and there are no surface charges or absorbed impurities at the interface. Understanding how the back contact affects open circuit voltage allows us to better analyze surface chemistry and what factors into energy conversion.
Worcester Polytechnic Institute
Major Qualifying Project
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Chemistry and Biochemistry