Determination of carrier mobility in MEH-PPV thin-films by stationary and transient current techniques
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
04/11/2013
04/11/2013
2012
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Resumo |
Charge transport and shelf-degradation of MEH-PPV thin-films were investigated through stationary (e.g. current versus voltage - JxV) and transient (e.g. Time-of-Flight - ToF, Dark-Injection Space-Charge-Limited Current - DI-SCLC, Charge Extraction by Linearly Increasing Voltage - CELN) current techniques. Charge carrier mobility in nanometric films was best characterized through JxV and DI-SCLC. It approaches 10(-6) cm(2)Ns under a SCLC regime with deep traps for light-emitting diode applications. ToF measurements performed on micrometric layers (i.e. - 3 mu m) confirmed studies in 100 nm-thick films as deposited in OLEDs. All results were comparable to a similar poly(para-phenylene vinylene) derivative, MDMO-PPV. Electrical properties extracted from thin-film transistors demonstrated mobility dependence on carrier concentration in the channel (similar to 10(-7)-10(-4) cm(2)/Vs). At low accumulated charge levels and reduced free carrier concentration, a perfect agreement to the previously cited techniques was observed. Degradation was verified through mobility reduction and changes in trap distribution of states. (C) 2011 Elsevier B.V. All rights reserved. FAPESP [07/06064-0, 09/05589-7] FAPESP CAPES [222/08] CAPES CNPq (MCT/CT-INFO) [142302/2010-4] CNPq (MCT/CTINFO) |
Identificador |
JOURNAL OF NON-CRYSTALLINE SOLIDS, AMSTERDAM, v. 358, n. 3, supl. 1, Part 3, pp. 484-491, FEB 1, 2012 0022-3093 http://www.producao.usp.br/handle/BDPI/37899 10.1016/j.jnoncrysol.2011.11.001 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE BV AMSTERDAM |
Relação |
JOURNAL OF NON-CRYSTALLINE SOLIDS |
Direitos |
closedAccess Copyright ELSEVIER SCIENCE BV |
Palavras-Chave | #DI-SCLC #CELIV #TOF #OFET #OLED #LIGHT-EMITTING-DIODES #TIME-OF-FLIGHT #CURRENT-VOLTAGE CHARACTERISTICS #POLY(P-PHENYLENE VINYLENE) #CHARGE-TRANSPORT #HOLE TRANSPORT #SOLAR-CELLS #POLYMER #FIELD #TRANSISTORS #MATERIALS SCIENCE, CERAMICS #MATERIALS SCIENCE, MULTIDISCIPLINARY |
Tipo |
article original article publishedVersion |