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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Faria, G. C. [1, 2] ; Faria, R. M. [1] ; deAzevedo, E. R. [1] ; von Seggern, H. [2]
Número total de Autores: 4
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of Physical Chemistry C; v. 115, n. 51, p. 25479-25483, DEC 29 2011.
Citações Web of Science: 6
Resumo

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)

Processo FAPESP: 09/18354-8 - Dinâmica e estrutura de sistemas poliméricos estudados por ressonância magnética nuclear
Beneficiário:Eduardo Ribeiro de Azevedo
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 08/01935-5 - Correlação das propriedades óticas e elétricas com a estrutura física e dinâmica molecular de filmes e dispositivos orgânicos de polifluorenos e derivados
Beneficiário:Gregório Couto Faria
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 07/08688-0 - Dispositivos eletrônicos e optoeletrônicos poliméricos
Beneficiário:Roberto Mendonça Faria
Linha de fomento: Auxílio à Pesquisa - Temático