119th General Meeting of the KCS

Type Symposium
Area Chemical Application of X-ray Free Electron Laser (XFEL)
Room No. 304호
Time FRI 10:40-:
Code PHYS2-5
Subject Time-resolved photoelectron spectroscopy on charge transfer dynamics in organic solar cells
Authors 서현욱*, Tiberu Arion1, Friedrich Roth1, Wolfgang Eberhardt1, 김영독2
상명대학교 화학에너지공학과, Korea
1Center for Free Electron Laser Science, DESY, Hamburg, Germany, Germany
2성균관대학교 화학과, Korea
Abstract Organic solar cells (OSCS) has been extensively investigated for the last decade owing to their low-fabrication cost, high potential of large-scale production and application of flexible devices. There has been a quite huge technical success of improving the efficiency and stability of OSCs. However, the exact process of light to current conversion has not been well established so far. The light to electricity conversion of OSCs initiated by light absorption of photo-sensitive donor polymer followed by electron-hole pair (exciton) generation and charge transfer from donor to acceptor polymer. The time-resolved photoelectron spectroscopy technique can directly evidence the dynamics of photo-induced charge-transfer process in OSCs. Here the experimental results performed at Advanced Light Source (ALS) will be presented as an example of the direct observation of the electron transfer from CuPc (donor molecule) to C60 (acceptor molecule) using time-resolved X-ray photoelectron spectroscopy. The pulsed light source is essential for the time-resolved photoelectron spectroscopy and the table-top laser driven High Harmonic Generation (HHG) enable the access to VUV and soft X-ray photo energies also in the laboratory. This opens a lot of new possibilities in many scientific research fields of physics and chemistry in lab-based research facilities. In the end, the working principles of HHG-based light source will be presented together with the recent experimental study on the improving the HHG efficiency using the mixtures of two rare gases (Ar and Ne).
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