Facile tailoring of the electrical transport in representative hole transport materials by molecular doping

被引:4
作者
Li, Bixin [1 ]
Zhao, Chenyang [2 ]
Zhang, Shiyang [1 ]
Zhen, Min [1 ]
机构
[1] Hunan First Normal Univ, Lab Coll Phys, Dept Sci Educ, Changsha 410205, Hunan, Peoples R China
[2] Univ Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Jilin, Peoples R China
关键词
LIGHT-EMITTING-DIODES; ADMITTANCE SPECTROSCOPY; CHARGE-TRANSPORT; MOBILITY; POLYMER;
D O I
10.1039/c8ra03707h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
N,N'-Diphenyl-N,N'-bis(1-naphthyl)-1,1'-biphenyl-4,4'-diamine (NPB) and 4,4',4"-tris (N-3-methylphenyl-N-phenylamine) triphenylamine (m-MTDATA) are widely used as hole transport materials in organic optoelectronic devices. In the present article, the hole transport properties of blends of NPB and m-MTDATA compared with the pristine materials are investigated using admittance spectroscopy and considering temperature dependent current-voltage characteristics and electroluminescent characteristics. It has been found that m-MTDATA dramatically lowers the carrier mobility in the NPB matrix to a large extent by enhancing the total density of traps and results in more dispersive transport. However, by introducing NPB into m-MTDATA the hole mobility is nearly unchanged in comparison with pristine m-MTDATA film. These differences are attributed to two different charge transport mechanisms, trapping and scattering. Obtained quantitative information regarding the charge transport parameters could help to extend optimization strategies for the fabrication of new organic optoelectronic devices by enabling the facile tailoring of the charge transport process.
引用
收藏
页码:26230 / 26236
页数:7
相关论文
共 32 条
[1]   Electron mobility in tris(8-hydroxy-quinoline)aluminum thin films determined via transient electroluminescence from single- and multilayer organic light-emitting diodes [J].
Barth, S ;
Müller, P ;
Riel, H ;
Seidler, PF ;
Riess, W ;
Vestweber, H ;
Bässler, H .
JOURNAL OF APPLIED PHYSICS, 2001, 89 (07) :3711-3719
[2]   Dispersive electron transport in tris(8-hydroxyquinoline) aluminum (Alq3) probed by impedance spectroscopy -: art. no. 286601 [J].
Berleb, S ;
Brütting, W .
PHYSICAL REVIEW LETTERS, 2002, 89 (28)
[3]  
borsenberger P.M., 1993, ORGANIC PHOTORECEPTO
[4]   Trap-limited hole mobility in semiconducting poly(3-hexylthiophene) [J].
Chiguvare, Z ;
Dyakonov, V .
PHYSICAL REVIEW B, 2004, 70 (23) :1-8
[5]   Transition metal oxides as charge injecting layer for admittance spectroscopy [J].
Hoping, M. ;
Schildknecht, C. ;
Gargouri, H. ;
Riedl, T. ;
Tilgner, M. ;
Johannes, H. -H. ;
Kowalsky, W. .
APPLIED PHYSICS LETTERS, 2008, 92 (21)
[6]   Investigation of disorder and its effect on electrical transport in electrochemically doped polymer devices by current-voltage and impedance spectroscopy [J].
Khan, Motiur Rahman ;
Anjaneyulu, P. ;
Rao, K. S. R. Koteswara ;
Menon, R. .
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2017, 50 (09)
[7]   Trap density in conducting organic semiconductors determined from temperature dependence of J-V characteristics [J].
Kumar, V ;
Jain, SC ;
Kapoor, AK ;
Poortmans, J ;
Mertens, R .
JOURNAL OF APPLIED PHYSICS, 2003, 94 (02) :1283-1285
[8]  
Lampert M.A., 1970, Current Injection in Solids
[9]   Charge Transport in Mixed Organic Disorder Semiconductors: Trapping, Scattering, and Effective Energetic Disorder [J].
Li, Chen ;
Duan, Lian ;
Sun, Yongduo ;
Li, Haoyuan ;
Qiu, Yong .
JOURNAL OF PHYSICAL CHEMISTRY C, 2012, 116 (37) :19748-19754
[10]   Charge carrier mobility of mixed-layer organic light-emitting diodes [J].
Liu, Shun-Wei ;
Lee, Jiun-Haw ;
Lee, Chih-Chien ;
Chen, Chin-Ti ;
Wanga, Juen-Kai .
APPLIED PHYSICS LETTERS, 2007, 91 (14)