Perylene TCNQ Charge Transfer crystal complex for use in organic solar cells
Dahal, Ekraj
Dahal, Ekraj
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Abstract
The ability of electron donor-acceptor molecules in charge transfer (CT) complex to excite electron straight to the acceptor molecule with low energy light make them interesting materials for use in solar cells. In conventional organic solar cells, the CT complex functions as an intermediate step between the exciton dissociation and charge extraction. Our goal is to use the CT complex as the primary method of photogeneration. By bypassing the excition dissociation, we minimize the energy loss and raise the theoretical maximum efficiency. Experimental studies have generated charge-transfer crystals with photon absorptions extending into the near infrared, covering a far wider range of the solar spectrum than previous organic solar cell candidates. The photon flux of solar spectrum is at its highest level near infrared, which helps in larger short circuit current density Jsc. We have studied the perylene and tetracyanoquinodimethane (TCNQ) CT complex thermally evaporated in a vacuum environment in a ratio of 3:1. Our photovoltaic device functions under infrared and visible illumination, which is direct evidence of excitation of the CT state followed by free carrier generation.
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Date
2019-01-01
Student Status
Graduate
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Oral Paper Presentation
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Materials Science
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College of Engineering and Mathematical Sciences
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Engineering & Physical Sciences