Desenvolvimento, produção e caracterização de compósito semicondutor com elevada estabilidade química

• Autor(a) principal: Santos, Danilo dos [UNESP]
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156974; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-08-30/000906259.pdf
• topic: Semicondutores; Semicondutores - Dopagem; Compósitos poliméricos; Condutores eletricos; Eletrodos; Condutividade eletrica; Polímeros; Processo sol-gel

The electrical properties of solution-processed electronic materials have been studied because it is possible produces low-cost electronic devices by high productivity techniques as, for example, screen printing, spray-coating and roll-to-roll. In this research, we studied the electrical properties of a composite prepared with doped poly(o-methoxyaniline), POMA, and with 3-glycidyloxypropyl-trimethoxysilane, GPTMS. We produced lms of this composite onto glass substrates by spray-coating and gold top electrodes, electrical contacts, were produced by thermal evaporation. The electrical characterization of the composite was performed in steady state (dc) regime in order to study the dependence of the composite electrical conductivity with the POMA concentration in the GPTMS matrix. The composite material exhibited low electrical conductivity for POMA concentrations below 50%-wt, with an abrupt enhancement of the electrical conductivity with the POMA concentration increasing. The transition between the low and high conductivity regimes was interpreted considering that for 50% -wt of POMA occurs the percolation of the electronic phase on the biphasic material. The charge transport mechanism in the composite was studied performing the electrical characterization in diverse temperature conditions. The dependence of the composite electrical conductivity on the temperature was interpreted considering the hopping model as charge transport mechanism. We showed that the charge transport activation energy in the composite exhibits a linear increasing, from 10 meV to 80 meV, with the increasing of the POMA concentration