TRANSPORT OF PHOTO ENERGY AND CHARGE CARRIERS IN POLYCONJUGATED POLYMER SYSTEMS
It is common place knowledge that the mobility of charge carriers in polymers (as archetypical examples of disordered organic solids) is of many magnitudes smaller compared to single crystals of material of similar chemical constitution. Disorder on the molecular length scale implies a rough energetic landscape in which charge carriers move in a gradient of electrical potential. Thus, the mobility (and conductivity) in a disordered (e.g. glassy) organic/polymer solid is not a well defined materials parameter but depends on the length of the time of observation and thus the length scale on which the motion is monitored. Moreover, the local and global morphology is of highest relevance. Based on such considerations H. Bassler 1 has developed a sound formalism to interpret time-of-flight (TOF) measurements of charge carrier mobilities depending on temperature and magnitude of the electric field. Here we report data obtained in our group 2 which corroborate the approach of H. B(a)ssler. They were obtained for commercially relevant materials (polyspirobifluorenes) to be used for construction of OLEDs.
Gerhard Wegner
Max Planck Institute for Polymer Research Mainz,Germany
国际会议
International Symposium on Polymer Physics(2008年国际高分子物理学术会议PP2008)
厦门
英文
300-301
2008-06-08（万方平台首次上网日期，不代表论文的发表时间）