Photoinduced Absorption Studies of the Deactivation of Excited Electronic States211 in Highly Ordered Films of Oligothiophenes. TMR Large-Scale Facilities Access 211 Programme

摘要

The present studies have shown the potential of the pump-probe technique in the211u001eelucidation of ultrafast processes in organic thin films. Further work is needed 211u001eto conclusively assign the observed decay traces to transient species. This will 211u001ebe greatly assisted by spectral detection, e.g. by an optical multichannel 211u001eanalyzing (OMA) system. In order to reduce thermal effects, measurements have to 211u001ebe performed at lower light levels (requiring enhanced signal to noise ratio) and 211u001esmaller beam spot areas. In order to investigate the effects of oxygen and of 211u001etemperature on the photophysics of organic films, especially on charge carrier 211u001eformation and recombination, experiments under high vacuum and at cryogenic 211u001etemperatures are necessary.