Comparative Study on Hole Transport in N,N'-bis(naphthalen-1-yl)-N,N'- bis(pheny) Benzidine and 4,4',4''-tri(N-carbazolyl)triphenylamine
QIAO Xian-Feng1,2, CHEN Jiang-Shan1, MA Dong-Ge1
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 2Graduate School of the Chinese Academy of Sciences, Beijing 100049
Comparative Study on Hole Transport in N,N'-bis(naphthalen-1-yl)-N,N'- bis(pheny) Benzidine and 4,4',4''-tri(N-carbazolyl)triphenylamine
QIAO Xian-Feng1,2, CHEN Jiang-Shan1, MA Dong-Ge1
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 2Graduate School of the Chinese Academy of Sciences, Beijing 100049
Hole transport characteristics in N,N'-bis(naphthalen-1-yl)-N,N'-bis(pheny) benzidine (NPB) and 4,4',4''-tri(N-carbazolyl)triphenylamine (TCTA) are comparatively investigated. The current density-voltage (J-V) characteristics of hole-only devices based on NPB and TCTA at different temperatures and thicknesses show that the hole current is dominated by the bulk conduction with an exponential trap distribution. Detailed analyses of the J-V characteristics give the trap densities Nt of (6.3±0.3)×1018 and (1.9±0.02)×1018 cm3, characteristic trap depths of 135±6 and 117±5 meV, hole mobilities of (8.1±0.5)×10-5 and (1.9±0.1)×10-4 cm2V-1s-1 for NPB and TCTA, respectively. It is found that TCTA exhibits higher hole mobility. Obviously, this is directly related to the lower trap density and shallow trap depth in TCTA films, leading to good charge carrier transport.
Hole transport characteristics in N,N'-bis(naphthalen-1-yl)-N,N'-bis(pheny) benzidine (NPB) and 4,4',4''-tri(N-carbazolyl)triphenylamine (TCTA) are comparatively investigated. The current density-voltage (J-V) characteristics of hole-only devices based on NPB and TCTA at different temperatures and thicknesses show that the hole current is dominated by the bulk conduction with an exponential trap distribution. Detailed analyses of the J-V characteristics give the trap densities Nt of (6.3±0.3)×1018 and (1.9±0.02)×1018 cm3, characteristic trap depths of 135±6 and 117±5 meV, hole mobilities of (8.1±0.5)×10-5 and (1.9±0.1)×10-4 cm2V-1s-1 for NPB and TCTA, respectively. It is found that TCTA exhibits higher hole mobility. Obviously, this is directly related to the lower trap density and shallow trap depth in TCTA films, leading to good charge carrier transport.
QIAO Xian-Feng;CHEN Jiang-Shan;MA Dong-Ge. Comparative Study on Hole Transport in N,N'-bis(naphthalen-1-yl)-N,N'- bis(pheny) Benzidine and 4,4',4''-tri(N-carbazolyl)triphenylamine[J]. 中国物理快报, 2010, 27(8): 88504-088504.
QIAO Xian-Feng, CHEN Jiang-Shan, MA Dong-Ge. Comparative Study on Hole Transport in N,N'-bis(naphthalen-1-yl)-N,N'- bis(pheny) Benzidine and 4,4',4''-tri(N-carbazolyl)triphenylamine. Chin. Phys. Lett., 2010, 27(8): 88504-088504.
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