Loading...
Strain Effects on Coherent Excitons in Organic Crystalline Thin Films
Czar, Katrina E
Czar, Katrina E
Citations
Altmetric:
License
DOI
Abstract
For this thesis the effects of strain on excitons in organic thin film semiconductors is investigated. A hollow-capillary pen writing technique was used to create highly ordered thin films deposited on a flexible substrate. Metal-free octabutoxy-phthalocyanine (H2OBPc) was chosen for this study because it forms long chains of molecules with strong π −π interactions. Absorbance and linear dichroism measurements were performed on films with varying levels of strain applied along the stacking axis, with the total strain averaging 8%. A k-vector study was also conducted to investigate whether the molecular stacking angle is changing due to strain. It was hypothesized that strain applied along the stacking axis would cause a peak shift in the absorbance spectrum, and could potentially cause a shift in the molecular stacking angle of each molecule relative to the substrate. Red-shifting of the exciton peaks was observed in both the absorbance and linear dichroism spectra. An overall reduction in the linear dichroism was observed regardless of the incident angle in the k-vector study, indicating that the molecular stacking angle is changing.
Description
Date
2019-01-01
Journal Title
Journal ISSN
Volume Title
Publisher
Files
Loading...
thesis.pdf
Adobe PDF, 33.49 MB