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2D POLIM on OPV

Microstructure and local energy transfer of organic photovoltaics

Image of polarization phases in emission obtained by 2D POLIM from liquid spread TQ1 film. The macroscopic spreading direction is indicated by a blue arrow. Smaller arrows visualize the orientation of the polarization phases in several regions. As the optical transition dipole in TQ1 is parallel to the polymer backbone, the phase orientations mark local polmer chain orientations.
Correlation of fluorescence intensity, modulation depth in emission, phase angle of polarization in emission and energy funneling efficiency along a cross section (shown as dashed blue line in image of phase angles).

The performance of organic photovoltaics crucially depends on the local polymer organization. By employing 2D POLarization IMaging we can reveal the microstructure of bulk heterojunction all-polymer blends as well as of thin conjugated polymer films prepared by the floating film transfer method [1]. Localized correlations of several 2D POLIM parameters allow for retriving the local polymer chain organisation within the liquid spread polymer film.

[1] D. Täuber, W. Cai, O. Inganäs, I.G. Scheblykin: Macroscopic Domains within an Oriented TQ1 Film Visualized Using 2D Polarization Imaging, ACS Omega doi: 10.1021/acsomega.6b00264.

People involved:

 

Daniela Täuber

Juanzi Shi

Yuxi Tian

 

*Daniela Täuber

Techniques used

 

2D POLIM

Fluorescence lifetime measurements

Fluorescence and absorption spectroscopy