Chlorinated indium tin oxide as a charge injecting electrode for admittance spectroscopy

✍ Scribed by M.G. Helander; Z.B. Wang; Z.H. Lu

• Book ID: 103877599
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 379 KB
• Volume: 12
• Category: Article
• ISSN: 1566-1199
• DOI: 10.1016/j.orgel.2011.06.005

✦ Synopsis

Admittance spectroscopy (AS) is a simple technique to measure the carrier mobility of organic semiconductors, but requires an Ohmic contact for charge injection. Chlorinated indium tin oxide (Cl-ITO) is shown to be a good charge injecting electrode for AS due to its high work function of >6.1 eV. The mobility of N,N 0 -diphenyl-N,N 0 -bis-(1-naphthyl)-1-1 0 -biphenyl-4,4 0 -diamine (a-NPD) measured with Cl-ITO was found to be in excellent agreement with the value measured by time of flight. Cl-ITO is therefore an ideal electrode for AS since it possesses a high work function, but does not introduce any series impedance into the device structure.