Laser induced/scribed graphene electrodes for all printed transistors

• Autor(a) principal: Machado, Mónica Isabel de Abreu
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10362/118783
• topic: laser induced graphene; polyamide; electrolyte-gated transistor; Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias

This work reports the development of electrolyte gated transistors (EGTs) whose source, drain and gate electrodes are made of laser induced graphene (LIG) on polyamide (PI). The direct patterning of such electrodes with an intended application for EGTs has never been accomplished before. LIG was characterized using a scanning electron microscope (SEM) and Raman Spectroscopy. The minimum sheet resistance achieved with this laser method was 24 Ω/sq. Two types of staggered bottom gate transistors were printed, one using a reusable hydrogel sticker electrolyte and the other using a liquid electrolyte, tetramethylammonium hydrogen phthalate. A semiconducting ink based on a dispersion of zinc oxide nanoparticles (ZnO) on ethyl cellulose (EC) was screen-printed on the PI substrate. Electrochemical Impedance Spectroscopy (EIS) and cyclic voltammetry (CV) was performed with the intent to evaluate the electric double layer (EDL) formation on EGTs. e. The ZnO EGts present some electrical modulation with On/Off ratios orders of 102, transconductance orders of 105 S and saturation mobilities (µsat) orders estimated at 10-3 cm-2(Vs)-1.