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Charge transport and injection in am...

Tse, Shing Chi.

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Charge transport and injection in amorphous organic electronic materials.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Charge transport and injection in amorphous organic electronic materials./
Author:	Tse, Shing Chi.
Description:	173 p.
Notes:	Adviser: Shu Kong So.
Contained By:	Dissertation Abstracts International69-02B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3302374
ISBN:	9780549481041

Charge transport and injection in amorphous organic electronic materials.
Tse, Shing Chi.

Charge transport and injection in amorphous organic electronic materials. - 173 p.

Adviser: Shu Kong So.

Thesis (Ph.D.)--Hong Kong Baptist University (Hong Kong), 2007.

This thesis presents how we use various measuring techniques to study the charge transport and injection in organic electronic materials. Understanding charge transport and injection properties in organic solids is of vital importance for improving performance characteristics of organic electronic devices, including organic-light-emitting diodes (OLEDs), photovoltaic cells (OPVs), and field effect transistors (OFETs).

ISBN: 9780549481041Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Charge transport and injection in amorphous organic electronic materials.
LDR:04050nam 2200325 a 45 001 962507
005 20110830
008 110831s2007 ||||||||||||||||| ||eng d
020 $a 9780549481041
035 $a (UMI)AAI3302374
035 $a AAI3302374
040 $a UMI $c UMI
100 1 $a Tse, Shing Chi. $3 1285565
245 1 0 $a Charge transport and injection in amorphous organic electronic materials.
300 $a 173 p.
500 $a Adviser: Shu Kong So.
500 $a Source: Dissertation Abstracts International, Volume: 69-02, Section: B, page: 1076.
502 $a Thesis (Ph.D.)--Hong Kong Baptist University (Hong Kong), 2007.
520 $a This thesis presents how we use various measuring techniques to study the charge transport and injection in organic electronic materials. Understanding charge transport and injection properties in organic solids is of vital importance for improving performance characteristics of organic electronic devices, including organic-light-emitting diodes (OLEDs), photovoltaic cells (OPVs), and field effect transistors (OFETs).
520 $a The charge transport properties of amorphous organic materials, commonly used in organic electronic devices, are investigated by the means of carrier mobility measurements. Transient electroluminescence (EL) technique was used to evaluate the electron mobility of an electron transporting material--- tris(8-hydroxyquinoline) aluminum (Alq3). The results are in excellent agreement with independent time-of-flight (TOF) measurements. Then, the effect of dopants on electron transport was also examined.
520 $a TOF technique was also used to examine the effects of tertiary-butyl (t-Bu) substitutions on anthracene derivatives (ADN). All ADN compounds were found to be ambipolar. As the degree of t-Bu substitution increases, the carrier mobilities decrease progressively. The reduction of carrier mobilities with increasing t-butylation can be attributed to a decrease in the charge-transfer integral or the wavefunction overlap.
520 $a In addition, from TOF measurements, two naphthylamine-based hole transporters, namely, N,N'-diphenyl-N,N'-bis(1-naphthyl)(1,1'-biphenyl)-4,4'diamine (NPB) and 4,4',4"-tris(n-(2-naphthyl)-n-phenyl-amino)-triphenylamine (2TNATA) were found to possess electron-transporting (ET) abilities. An organic light-emitting diode that employed NPB as the ET material was demonstrated. The electron conducting mechanism of NPB and 2TNATA in relation to the hopping model will be discussed. Furthermore, the ET property of NPB applied in OLEDs will also be examined.
520 $a Besides transient EL and TOF techniques, we also use dark-injection space-charge-limited current (DISCLC) to study the charge injection properties of three phenylamine-based (PA) compounds, MTDATA (4,4',4''-Tris(N-3-methylphenyl-N-phenyl-amino)triphenylamine), NPB, and TPD (N,N'-diphenyl-N,N'-bis(3-methyl phenyl) (1,1'-biphenyl)-4,4'diamine).Poly(3,4-ethylenedioxythiophene) doped with polystyrenesulphonic acid (PEDOT:PSS) was used as a hole-injecting anode in current-voltage (JV) and DISCLC. Clear DISCLC transient peaks were observed over a wide range of electric fields in all cases. For MTDATA and NPB, hole mobilities evaluated by DI experiments are in excellent agreement with mobilties deduced from TOF technique. It can be concluded that, for the purpose of JV and DI experiments, PEDOT:PSS forms an Ohmic contact with MTDATA and a quasi-Ohmic contact with NPB despite the relatively low-lying highest occupied molecular orbital of the later. In the case of TPD, hole injection from PEDOT:PSS deviates substantially from Ohmic injection, leading to a lower than expected DI-extracted hole mobility. Finally, a composite anode will be demonstrated to improve the hole injection efficiency.
590 $a School code: 0023.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Physics, Molecular. $3 1018648
690 $a 0609
690 $a 0794
710 2 $a Hong Kong Baptist University (Hong Kong). $3 1020736
773 0 $t Dissertation Abstracts International $g 69-02B.
790 $a 0023
790 1 0 $a So, Shu Kong, $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3302374