Superfluid helium nanodroplets and rare gas clusters are used to synthesize molecular complexes and nanostructures at millikelvin temperatures. In such systems, charge and excitation transfer and corresponding decay and loss mechanism are studied in order to isolate and understand fundamental light-induced processes of organic photovoltaics and optoelectronic devices. For measuring ultra-fast dynamics, we have established 2-dimensional coherent electronic spectroscopy (2DES), well-know from bulk biological systems, for very dilute targets. With 2DES one can follow real-time dynamics on femtosecond time scales and unravel energetic structures and couplings. First results will be presented along with a comparison of different experimental techniques for short-time dynamics, their limitations and how one can extend these even to XUV wavelength.
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