澳大利亚墨尔本大学的郝晓涛博士应我所潘教青研究员的邀请，于2012年10月22日来我所进行学术交流，并作了题为“Correlating morphology and electronic structures of organic photovoltaic materials”的学术报告。

报告摘要：As novel promising materials employed in the development of plastic electronics, solution-processible conducting polymers with p-conjugated electronic structures have been attracting intensive attention in both fundamental and applied aspects in recent years. The solid-state characteristics of such polymers are the key factors that govern the performance of organic opto-electronic devices. It has been realized that the optical, electronic and mechanical properties of these materials depend greatly on preparation methods of their thin films and the resulting polymer chain conformation/morphologyin films.It is critical to investigate thevariation of electronic structurerelated to the morphology, such as aggregation and ordering, in the conjugated polymer thin films.

We report here the steady state and time-resolved fluorescence emission characteristics of thin films of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV) and a water-soluble PPV derivative with sulphonate-containing side chains (DPS-PPV), with different conformations coated from various methods.We observed inhomogeneities in the morphology and fluorescence dynamics of thin films of the light emitting conjugated polymer, on sub-micrometre spatial and picosecond temporal scales using time-resolved scanning confocal fluorescence imaging measurements.

We also demonstrate evidence that the p-electron density distribution at the outermost surface can be controlled in conjugated regio-regular poly(3-hexyl thiophene) (P3HT) thin films, by the investigation using the powerful combination of near edge X-ray absorption fine structure spectroscopy, ultraviolet photoelectron spectroscopy, and the most surface-sensitive technique: Penning ionization electron spectroscopy.