Open AccessPreliminary investigation on the method of determining electron mobility of tris (8-hydroxyquinolinato) aluminum by space charge limited current
Author(s) -
骆杨,
段羽,
Ping Chen,
臧春亮,
谢月,
赵毅,
刘式墉
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.147801
Subject(s) - materials science , space charge , electron mobility , ohmic contact , optoelectronics , oled , electron , aluminium , transistor , diode , tris , organic semiconductor , electrode , layer (electronics) , nanotechnology , chemistry , voltage , electrical engineering , physics , composite material , biochemistry , quantum mechanics , engineering
The charge-carrier mobility of an organic semiconducting material determines the material potential applications in devices. The investigation on mobility of organic material plays a significant role in improving the performance of organic device, such as organic light emitting diode, organic solar cell and organic thin film transistor. In this paper, we employ the space charge limited current (SCLC) method to evaluate the electron mobility of the controlled device based on tris (8-hydroxyquinolinato) aluminum (Alq3). The zero-field mobilities and field-dependent factors of the four devices are fitted respectively. The results show that depositing Al as top-electrode onto buffer layer LiF (1 nm) and Alq3 (100 nm) can significantly improve the the zero-field mobility and field-dependent factor of Alq3. The reason for that is that LiF could strengthen the complex reaction between Al and Alq3 to form Li+1Alq-1 particles, which leads to the enhanced ohmic injection and electron injection.