Authors:

Nick Frainey

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Thin Films Co-Author(s): Zachary Walbrun, Cathy Wong Thin films of copper phthalocyanine (CuPc) show promise for use in organic photovoltaics (OPVs) due to their strong electron-donating abilities coupled with high degrees of thermal and chemical stability. CuPc is an inexpensive and commercially available dye which forms pyramidal nanoribbon meshes when solubilized in trifluoroacetic acid and cast as a thin film. This pyramidal morphology is ideal for application in OPVs as it allows for the intercalation of electron acceptor materials into the nanomesh void spaces. The resultant increased donor-acceptor interfacial area induces facile charge transfer. Traditional spectroscopic techniques have been able to measure the optoelectronic properties of static samples of CuPc in solution and as a thin film; we employ various time-resolved spectroscopies to measure electronic structure and excited-state dynamics during molecular aggregation. My in situ absorption measurements reveal a novel intermediate phase during thin film deposition with unique optical properties, and concurrent solvent mass measurements show a drastic slowing of the evaporation rate during this intermediate phase. We use single- shot transient absorption (SSTA), a novel spectroscopic technique, to probe excited-state dynamics of rapidly evolving systems. SSTA data collected during CuPc thin film deposition shows mysteriously high TA signal during the intermediate phase. These measurements reveal a molecular-level picture of what occurs during thin film formation. 160 UNIVERSITY OF OREGON • 2024 UNDERGRADUATE RESEARCH SYMPOSIUM

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University of Oregon / 2024

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Co-authors:

Nick Frainey