Transport mechanisms in tris(8-hydroxyquinoline)aluminium (Alq3) electronic layers : a study by photodipolar absorption
Identifieur interne : 008096 ( Main/Repository ); précédent : 008095; suivant : 008097Transport mechanisms in tris(8-hydroxyquinoline)aluminium (Alq3) electronic layers : a study by photodipolar absorption
Auteurs : RBID : Pascal:06-0283155Descripteurs français
- Pascal (Inist)
- Conductivité électrique, Spectre absorption, Pompage optique, Piégeage porteur charge, Etat défaut, Thermoluminescence, Niveau énergie, Dépendance tension, Impédance électrique, Electroluminescence, Aluminium composé, Quinoléine dérivé, Structure sandwich, Indium oxyde, Etain oxyde, Aluminium, 7867, 7363.
- Wicri :
- concept : Aluminium.
English descriptors
- KwdEn :
- Absorption spectra, Aluminium, Aluminium compounds, Charge carrier trapping, Defect states, Electric impedance, Electrical conductivity, Electroluminescence, Energy levels, Indium oxides, Optical pumping, Quinoline derivatives, Sandwich structures, Thermoluminescence, Tin oxides, Voltage dependence.
Abstract
This paper describes the role of traps in the electronic conductivity of tris(8-hydroxyquinoline)aluminium (Alq3) in a conventional sandwich structure with indium tin oxide and aluminium electrodes. New results obtained by photodipolar absorption techniques and impedance spectroscopy are presented. The former method acts as a probe to highlight the role of traps. It is shown that optical pumping of electrons to trap levels gives a clear increase in dielectric absorption due to the reorientation of dipoles associated with trapped charges. The trap depth is estimated to be around Et = 0.19 eV, a value in good agreement with theoretical calculations and thermoluminescence measurements. The latter method permits a representation of the sample in terms of a circuit composed of a parallel capacitor (Cp) and resistor (Rp) both in series with a resistor Rs50Ω located on the anode side. A logarithmic plot of Rp as a function of the dc bias voltage gives a linear law that is recognized, for the first time, to be a consequence of a trapped charge limited (TCL) current. The linearity can be improved by the introduction of a field-dependent mobility.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Transport mechanisms in tris(8-hydroxyquinoline)aluminium (Alq3) electronic layers : a study by photodipolar absorption</title><author><name sortKey="Moliton, A" uniqKey="Moliton A">A. Moliton</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>UMOP, CNRS - FRE 2701, Faculté des Sciences et Techniques</s1><s2>87060 - Limoges</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Limousin</region><settlement type="city">- Limoges</settlement></placeName></affiliation></author><author><name sortKey="Lucas, B" uniqKey="Lucas B">B. Lucas</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>UMOP, CNRS - FRE 2701, Faculté des Sciences et Techniques</s1><s2>87060 - Limoges</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Limousin</region><settlement type="city">- Limoges</settlement></placeName></affiliation></author><author><name sortKey="Berthon, S" uniqKey="Berthon S">S. Berthon</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>UMOP, CNRS - FRE 2701, Faculté des Sciences et Techniques</s1><s2>87060 - Limoges</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Limousin</region><settlement type="city">- Limoges</settlement></placeName></affiliation></author><author><name sortKey="Rammal, W" uniqKey="Rammal W">W. Rammal</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>UMOP, CNRS - FRE 2701, Faculté des Sciences et Techniques</s1><s2>87060 - Limoges</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Limousin</region><settlement type="city">- Limoges</settlement></placeName></affiliation></author><author><name sortKey="Hiorns, R C" uniqKey="Hiorns R">R. C. Hiorns</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Laboratoire de Physico-Chimie des Polymères, CNRS - UMR 5067, Hélioparc Pau-Pyrénées, 2 Avenue du Président Angot</s1><s2>64053 Pau</s2><s3>FRA</s3><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Aquitaine</region><settlement type="city">Pau</settlement></placeName></affiliation></author></titleStmt><publicationStmt><idno type="inist">06-0283155</idno><date when="2006">2006</date><idno type="stanalyst">PASCAL 06-0283155 INIST</idno><idno type="RBID">Pascal:06-0283155</idno><idno type="wicri:Area/Main/Corpus">008E85</idno><idno type="wicri:Area/Main/Repository">008096</idno></publicationStmt><seriesStmt><idno type="ISSN">1478-6435</idno><title level="j" type="abbreviated">Philos. mag. : (2003, Print)</title><title level="j" type="main">Philosophical magazine : (2003. Print)</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absorption spectra</term><term>Aluminium</term><term>Aluminium compounds</term><term>Charge carrier trapping</term><term>Defect states</term><term>Electric impedance</term><term>Electrical conductivity</term><term>Electroluminescence</term><term>Energy levels</term><term>Indium oxides</term><term>Optical pumping</term><term>Quinoline derivatives</term><term>Sandwich structures</term><term>Thermoluminescence</term><term>Tin oxides</term><term>Voltage dependence</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Conductivité électrique</term><term>Spectre absorption</term><term>Pompage optique</term><term>Piégeage porteur charge</term><term>Etat défaut</term><term>Thermoluminescence</term><term>Niveau énergie</term><term>Dépendance tension</term><term>Impédance électrique</term><term>Electroluminescence</term><term>Aluminium composé</term><term>Quinoléine dérivé</term><term>Structure sandwich</term><term>Indium oxyde</term><term>Etain oxyde</term><term>Aluminium</term><term>7867</term><term>7363</term></keywords><keywords scheme="Wicri" type="concept" xml:lang="fr"><term>Aluminium</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This paper describes the role of traps in the electronic conductivity of tris(8-hydroxyquinoline)aluminium (Alq3) in a conventional sandwich structure with indium tin oxide and aluminium electrodes. New results obtained by photodipolar absorption techniques and impedance spectroscopy are presented. The former method acts as a probe to highlight the role of traps. It is shown that optical pumping of electrons to trap levels gives a clear increase in dielectric absorption due to the reorientation of dipoles associated with trapped charges. The trap depth is estimated to be around E<sub>t</sub> = 0.19 eV, a value in good agreement with theoretical calculations and thermoluminescence measurements. The latter method permits a representation of the sample in terms of a circuit composed of a parallel capacitor (C<sub>p</sub>) and resistor (Rp) both in series with a resistor R<sub>s</sub>50Ω located on the anode side. A logarithmic plot of Rp as a function of the dc bias voltage gives a linear law that is recognized, for the first time, to be a consequence of a trapped charge limited (TCL) current. The linearity can be improved by the introduction of a field-dependent mobility.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>1478-6435</s0></fA01><fA03 i2="1"><s0>Philos. mag. : (2003, Print)</s0></fA03><fA05><s2>86</s2></fA05><fA06><s2>19</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Transport mechanisms in tris(8-hydroxyquinoline)aluminium (Alq3) electronic layers : a study by photodipolar absorption</s1></fA08><fA11 i1="01" i2="1"><s1>MOLITON (A.)</s1></fA11><fA11 i1="02" i2="1"><s1>LUCAS (B.)</s1></fA11><fA11 i1="03" i2="1"><s1>BERTHON (S.)</s1></fA11><fA11 i1="04" i2="1"><s1>RAMMAL (W.)</s1></fA11><fA11 i1="05" i2="1"><s1>HIORNS (R. C.)</s1></fA11><fA14 i1="01"><s1>UMOP, CNRS - FRE 2701, Faculté des Sciences et Techniques</s1><s2>87060 - Limoges</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></fA14><fA14 i1="02"><s1>Laboratoire de Physico-Chimie des Polymères, CNRS - UMR 5067, Hélioparc Pau-Pyrénées, 2 Avenue du Président Angot</s1><s2>64053 Pau</s2><s3>FRA</s3><sZ>5 aut.</sZ></fA14><fA20><s1>2847-2863</s1></fA20><fA21><s1>2006</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>134A3</s2><s5>354000142591300050</s5></fA43><fA44><s0>0000</s0><s1>© 2006 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>26 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>06-0283155</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Philosophical magazine : (2003. 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The latter method permits a representation of the sample in terms of a circuit composed of a parallel capacitor (C<sub>p</sub>) and resistor (Rp) both in series with a resistor R<sub>s</sub>50Ω located on the anode side. A logarithmic plot of Rp as a function of the dc bias voltage gives a linear law that is recognized, for the first time, to be a consequence of a trapped charge limited (TCL) current. 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