Eur. Phys. J. Appl. Phys.
Volume 68, Number 3, December 2014
|Number of page(s)||5|
|Section||Physics of Organic Materials and Devices|
|Published online||12 December 2014|
Research of carrier mobility in NPD through negative differential susceptance spectra
Key Laboratory for Organic Electronics and Information Displays (KLOEID), Singapore-Jiangsu Joint Research Center for Organic/Bio Electronics & Information Displays (COEID), Institute of Advanced Materials (IAM),Nanjing University of Posts and Telecommunications (NUPT), Nanjing
210023, P.R. China
2 College of automation, Nanjing University of Posts and Telecommunications (NUPT), Nanjing 210023, P.R. China
b e-mail: email@example.com
Revised: 21 October 2014
Accepted: 7 November 2014
Published online: 12 December 2014
In this paper, the hole carrier mobility of organic semiconductor N,N′-diphenyl-N,N′bis(1,1′-biphenyl)-4,4′-diamine (NPD) was researched by negative differential susceptance spectra (−ΔB = −w(C − Cgeo) ~ f). Under the condition of space charge limited current (SCLC), through solving the drift current equation and Poisson equation and simulating the spectra −ΔB = −w(C − Cgeo) ~ f, the relationship between the peak of −ΔB = −w(C − Cgeo) ~ f spectra (1/ƒp = τp) and the transfer time of carrier (τdc) could be achieved to be τdc = k × τp. So the hole-only device of ITO/NPD/Ag was fabricated to determine the capacitance spectra, and through which its −ΔB = −w(C − Cgeo) ~ f could be plotted. According to the relationship of τdc = k × τp, where k was determined to be 0.56, the transfer time and further the carrier mobility could be obtained. The carrier mobility depended on the electric field according to Poole-Frenkel model was further investigated in this report.
© EDP Sciences, 2014
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