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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.)

Temperature Dependence of the Drift Mobility of Poly(9,9 `-dioctylfluorene-co-benzothiadiazole)-Based Thin-Film Devices

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Author(s):
Faria, G. C. [1, 2] ; Faria, R. M. [1] ; deAzevedo, E. R. [1] ; von Seggern, H. [2]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt - Germany
Total Affiliations: 2
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 115, n. 51, p. 25479-25483, DEC 29 2011.
Web of Science Citations: 6
Abstract

Charge transport in spin coated thin films of poly(9,9'-dioctylfluorene-co-benzothiadiazole) (F8BT) was studied using the Photo-Current Extraction by the Linear Increasing Voltage (Photo-CELIV) method in the temperature range of 120 to 420 K. A continuous change in the slope of a In mu versus T(-2) plot was detected at 205 K with a very weak temperature dependence of the mobility at lower temperatures. According to the Gaussian Disorder Model (GDM), this behavior can be attributed to a progressive decrease in the dispersiveness of the charge transport. In this sense, the weak temperature dependence of the mobility at low temperatures arises from the nonequilibrium condition between thermal released and trapped charges, so the transport becomes trap controlled at low temperature. Furthermore, another change in the mobility behavior was observed at about 360 K, which was related to the glass transitions of the material. This indicates that even for thin films the drift mobility can be significantly affected by a variation in the dynamics and local packing of the polymer chains, which can be detected by Photo-CELIV (AU)

FAPESP's process: 09/18354-8 - Dynamics and structure of polymer systems as studied by nuclear magnetic resonance
Grantee:Eduardo Ribeiro de Azevedo
Support type: Regular Research Grants
FAPESP's process: 07/08688-0 - Electronic and optoelectronic polymer devices
Grantee:Roberto Mendonça Faria
Support type: Research Projects - Thematic Grants
FAPESP's process: 08/01935-5 - Correlation between electric and optical properties with molecular dynamics and physical structure of films and organic devices of polyfluorenes and its derivatives
Grantee:Gregório Couto Faria
Support type: Scholarships in Brazil - Doctorate