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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Determination of carrier mobility in MEH-PPV thin-films by stationary and transient current techniques

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Author(s):
Amorim, C. A. [1] ; Cavallari, M. R. [2] ; Santos, G. [2] ; Fonseca, F. J. [2] ; Andrade, A. M. [3] ; Mergulhao, S. [1]
Total Authors: 6
Affiliation:
[1] Univ Fed Sao Carlos, Dept Fis, Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Escola Politecn, BR-09500900 Sao Paulo - Brazil
[3] Univ Sao Paulo, Inst Eletrotecn & Energia, BR-09500900 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Non-Crystalline Solids; v. 358, n. 3, p. 484-491, FEB 1 2012.
Web of Science Citations: 44
Abstract

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. (AU)

FAPESP's process: 07/06064-0 - Development of a manufacturing methodology for organic thin film transistors
Grantee:Marco Roberto Cavallari
Support type: Scholarships in Brazil - Master
FAPESP's process: 09/05589-7 - Study and develoment of organic LEDs, solar cells, thin-film transistors and sensors based on semiconductor polymers
Grantee:Adnei Melges de Andrade
Support type: Regular Research Grants