| hotoinduced charge carrier generation and transport in single crystal polydiacetylenes with different side groups have been investigated. The charge carrier transport in the polydiacetylene PTS (polymer of 2,4-hexadiyne-1,6-diol, bis (p-toluenesulfonate)) was investigated. Two novel photoconductivity time-of-flight experiments were carried out to measure the charge carrier drift velocity along the polymer chain as a function of electric field. A saturated drift velocity was observed at relatively high electric fields (6,000V/cm-15,000V/cm). This saturation of drift velocity indicated that a trap-limited transport mechanism dominated the carrier transport at high electric fields. The second part of this work was the investigation of the steady state photoconductivity behavior of polydiacetylene single crystals with different side groups. Experimental results indicated that the side groups significantly influenced the photoconductivity behavior of the polydiacetylene single crystal. It is for the first time that the influence of the side group on the photoconductivity behavior in polydiacetylene was systematically studied. The third part of this work was the investigation of temperature dependence of UV-visible absorption spectra for polydiacetylene single crystals PTS and MADF (polymer of 1-(3-(methylamino)phenyl)-4-(3,5-bis(trifluoromethyl)-phenyl)butadiyne). The absorption peaks in both PTS and MADF shifted toward the red at low temperatures. However, only the peaks of PTS split at low temperatures (T... |
