Singlet Fission Organic Solar Cell with Long-Wavelength Absorption Using Non-fullerene Acceptors
Name
Wu-aliceqwu-SM-EECS-2022-thesis.pdf
Description
Thesis PDF
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888.91 KB
Format
Adobe PDF
Checksum (MD5)
9a261d6b001f13479636b46b285610ab
Author(s)
Wu, Alice Q.
Advisor(s)
Baldo, Marc
Date Issued
May 2022
Publisher
Massachusetts Institute of Technology
Abstract
Organic solar cells made with singlet exciton fission materials are able to convert a single photon into two charges. Paired with a long-wavelength absorbing acceptor material, singlet fission materials enable solar cells that exhibit the quantum efficiency benefits of a multi-junction solar cell, with the simplicity of a single-junction structure. We investigated bilayer solar cells using tetracene, a singlet fission material, and Y6, a long-wavelength non-fullerene acceptor material. We characterized their current-voltage characteristics, internal and external quantum efficiency, and change in photocurrent under a magnetic field. We demonstrated successful triplet exciton dissociation at the donor-acceptor interface and a positive contribution to the photocurrent from singlet fission. In addition, we investigated coupling a thin layer of tetracene to a PM6:Y6 bulk heterojunction solar cell, which is well-known OPV structure. We found that the addition of tetracene boosts external quantum efficiency at its peak absorption wavelengths and the overall power conversion efficiency. Further improvements to the device structure and materials should yield even more promising results.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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