Charge transport properties in liquid carbazole

✍ Scribed by J.-C. Ribierre; T. Aoyama; T. Muto; Y. Imase; T. Wada

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 180 KB
• Volume: 9
• Category: Article
• ISSN: 1566-1199
• DOI: 10.1016/j.orgel.2008.01.005

✦ Synopsis

The hole mobility in 9-(2-ethylhexyl)carbazole so-called liquid carbazole, in poly(N-vinylcarbazole) (PVK) and in their blends is determined by time-of-flight experiment using a phthalocyanine charge generation layer. With an applied electric field of 2.5 Â 10 5 V/cm, mobilities of 4 Â 10 À6 cm 2 /Vs and 6 Â 10 À7 cm 2 /Vs are measured in liquid carbazole and PVK, respectively. The enhancement of the charge carrier mobility in liquid carbazole is attributed to both a larger transfer integral and changes in the distribution of the excimer trapping sites. The results show the potential interest of liquid carbazole for electroactive applications in optoelectronics.