Luminescent Probes of Emergent Physics from Organic Semiconductor Interfaces
2022-12
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Luminescent Probes of Emergent Physics from Organic Semiconductor Interfaces
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2022-12
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Abstract
To prevent the most harmful effects of the present climate crisis, development ofhigher performance energy conversion devices is needed to accelerate the adoption of
renewable energy and energy efficiency technologies. Organic semiconductor materials
have demonstrated exciting efficiency gains in a variety of emerging and in-production
devices. These materials exhibit a variety of emergent material and device physics,
requiring additional research to understand and design next-generation energy conversion
technologies. Thin films of organic semiconductors, common in large-area optoelectronics
such as consumer displays, present rich photophysics due to forming room-temperature
stable excitons, unlike silicon or III-V semiconductors. A plethora of emergent phenomena
of excitons at organic semiconductor interfaces requires a detailed understanding of such
processes to optimally design devices such as energy-efficient lighting, flexible or
transparent solar cells, photodetectors and displays.
This dissertation focuses on investigating the novel optical physics of excited states
at organic donor-acceptor interfaces through emission spectroscopy of organic mixtures
and bilayer devices. In one study, exciplex diffusion is investigated in several donor-acceptor pairings toward an improved understanding of the mechanism of nanoscale energy
transport in organic semiconductor mixtures. Additionally, the effect of electric field on
exciplex emission spectra is studied to detail the effect of field on exciplex energy and
electron-hole separation. Finally, preliminary data displaying the effect of binary dilution
on exciplex energy in a two-component mixture is presented. All together, these findings
present new insights into the behavior of key device properties such as exciton diffusion
length and excited state energies to aid further study of device performance.
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University of Minnesota Ph.D. dissertation. December 2022. Major: Chemical Engineering. Advisor: Russell Holmes. 1 computer file (PDF); xi, 144 pages.
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Concannon, Nolan. (2022). Luminescent Probes of Emergent Physics from Organic Semiconductor Interfaces. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/252554.
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