Structural modifications to enhance the exciton diffusion in bilayer porphyrin fullerene thin films

Meesha Kaushal; Praveen Srinivasamurthy; Michael G. Walter

doi:10.1117/12.2236749

26 September 2016 Structural modifications to enhance the exciton diffusion in bilayer porphyrin fullerene thin films

Meesha Kaushal, Praveen Srinivasamurthy, Michael G. Walter

Proceedings Volume 9942, Organic Photovoltaics XVII; 99420X (2016) https://doi.org/10.1117/12.2236749
Event: SPIE Organic Photonics + Electronics, 2016, San Diego, California, United States

Abstract

The effects of peripheral alkyl groups and thermal annealing on the exciton quenching efficiency in bilayer porphyrinfullerene thin films has been investigated. The thin film UV-vis absorbance spectra, steady-state fluorescence emission, and thermal properties of three carboalkoxyphenyl porphyrin derivatives have been studied: tetra(4-carbohexoxyphenyl)porphyrin (TCH₄PP), tetra(4-carbo-2-ethylhexoxyphenyl)porphyrin (TCEH₄PP), and tetra(4-carbooctoxyphenyl)-porphyrin (TCO₄PP). The quenching efficiencies of these three derivatives have been calculated from their steady-state emission using pristine spin cast films and films with an evaporated C₆₀ bilayer. Structural analyses have been performed using X-ray diffraction (XRD), UV-vis spectroscopy, and thermal properties were studied using differential scanning calorimetry measurements (DSC). Annealing the films caused significant structural changes as was observed in the UV-vis absorbance spectra and XRD diffraction patterns. Prior to thermal annealing, quenching efficiencies are greatest for the TCH₄PP and TCO₄PP (hexyl and octyl derivatives), which is in agreement with previous bulk quenching experiments to calculate exciton diffusion lengths.¹ After annealing, the hexyl derivative (TCH₄PP) showed the lowest bilayer quenching efficiency and indicated evidence of significant molecular rearrangements.

Conference Presentation

Citation Download Citation

Meesha Kaushal, Praveen Srinivasamurthy, and Michael G. Walter "Structural modifications to enhance the exciton diffusion in bilayer porphyrin fullerene thin films", Proc. SPIE 9942, Organic Photovoltaics XVII, 99420X (26 September 2016); https://doi.org/10.1117/12.2236749

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