Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 26: Organic electronics and photovoltaics: Transport of charges - from molecules to devices (CPP with HL/TT)

HL 26.12: Talk

Tuesday, March 17, 2015, 12:30–12:45, C 130

Angle resolved spectroscopy resolving local morphology of organic optoelectronic materials — •Marius van den Berg, Anke Horneber, Kathrin Swider, Martin Meixner, and Dai Zhang — 1Institute of Physical and Theoretical Chemistry, University of Tübingen, Tübingen, Germany

The main component on which organic photovoltaic, transistor and photodetectors rely is the optoelectronic material. Knowledge about the local photophysical and photochemical properties of these materials at nanometer scale is important for improving overall performance and applicability [1]. The crystallinity and domain size of the local donor/acceptor morphology strongly affect the photon-electron conversion efficiencies of organic photovoltaics [2,3]. We aim at understanding the influences of nanometer scale morphology on the photophysical processes between donors and acceptors using a home built parabolic mirror assisted microscope. Using polarized excitation spectroscopy and angle resolved photoluminescence spectroscopy, we determine the relative degree of local structural order and molecular orientation in intact and photo degraded optoelectronic polymers. Furthermore, intensity changes in the angle resolved photoluminescence signals are compared with changes in the local photocurrent, to investigate morphology related photo degradation procedures, as well as the reversible/irreversible degradation steps in pi-conjugated polymers. 1)A. Dupuis et al. Eur. Phys. J. Appl. Phys. 56, 34104 (2011) 2)X. Wanget al. Small, 7, 2793 (2011) 3)R. Noriega et al. Nat. Mater., 12, 1038-1044, (2013)