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An improved unified description of charge-carrier mobilities in disordered organic semiconductors
Liguo Wang,Huaiwu Zhang,Xiaoli Tang,Chunhong Mu,Jun Li 한국물리학회 2010 Current Applied Physics Vol.10 No.4
An improved unified description of the dependence of the charge-carrier mobility on temperature, carrier density, and electric field in disordered organic semiconductors is proposed based on the Arrhenius temperature dependence ln(μ) ∝ / 1=T and non-Arrhenius temperature dependence ln(μ) ∝ / 1=T2. The improved description of the mobility can quite well fit the numerical solution of the master equation at both the low densities and high densities, the latter of which cannot be accurately described using the model introduced by Pasveer et al. [6]. Experimental current–voltage characteristics in devices based on organic semiconductors are also excellently reproduced with this improved description. Finally, we calculate and analyze the distribution of the charge-carrier density and electric field with position in polymer layer for two organic semiconductors in detail by using the improved description.
Zhiyong Zhong,Li Zhang,Huaiwu Zhang 한국물리학회 2008 Current Applied Physics Vol.8 No.1
This paper presents a method of heat-assisted magnetic probe recording on perpendicular medium. Electrical current from scanningtunneling microscope (STM) is employed as the major heating source. Recording medium is a strongly-coupled CoNi/Pt multilayeredshow that magnetic marks with an average size of 184 nm were formed for voltages above 4 V. A model is built to simulate the formationof magnetic domains in the processing of probe-based magnetic recording. Simulation results agree with experiments well.
Magnetic and Dielectric Properties of Low Temperature co-fired Na-Ta co-doped M-type Barium Ferrites
Shuai Wang,Jie Li,Yiheng Rao,Yan Yang,Gongwen Gan,Dongbin Tian,Sheng Li,Huaiwu Zhang Korean Magnetics Society 2018 Journal of Magnetics Vol.23 No.4
Na-Ta ions co-doped M-type barium ferrites, BaFe12-2x(NaTa)xO19, were synthesized at low temperature by the solid-state method. Na-Ta ion could occupy crystalline sites but not change the phase formation of barium ferrite. SEM images showed that samples had the regular and hexangular shape with 1-2 μm size. With the increase of Na-Ta, saturation magnetization (Ms) obviously decreased from 57.5 emu/g to 37.6 emu/g, and the coercivity (Hc) decreased from 4156 Oe to 2069 Oe. For dielectric properties, the real part permittivity (ε") increased when x from 0.0 to 0.3, reaching the maximum value in a range frequency of 10 MHz-500 MHz, while decreasing when x=0.4. This material would be applied in electronic devices using LTCC technology.