Prof. Rodrigo Ferrão de Paiva Martins Profile

Prof. Rodrigo Ferrão de Paiva Martins

Director at UNINOVA

SPIE Involvement:

Author

Proceedings Article | 2 March 2012 Paper

P-type oxide-based thin film transistors produced at low temperatures

R. Martins, V. Figueiredo, R. Barros, P. Barquinha, G. Gonçalves, L. Pereira, I. Ferreira, E. Fortunato

Proceedings Volume 8263, 826315 (2012) https://doi.org/10.1117/12.907387

KEYWORDS: Tin, Copper, Oxides, Oxygen, Semiconductors, Thin films, Transistors, P-type semiconductors, Annealing, Sputter deposition

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Proceedings Article | 1 March 2012 Paper

Multicomponent dielectrics for oxide TFT

Luís Pereira, Pedro Barquinha, Gonçalo Gonçalves, Elvira Fortunato, Rodrigo Martins

Proceedings Volume 8263, 826316 (2012) https://doi.org/10.1117/12.909454

KEYWORDS: Dielectrics, Oxides, Capacitance, Multilayers, Silica, Semiconductors, Silicon, Crystals, Interfaces, Protactinium

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Proceedings Article | 22 June 2011 Paper

Away from silicon era: the paper electronics

R. Martins, B. Brás, I. Ferreira, L. Pereira, P. Barquinha, N. Correia, R. Costa, T. Busani, A. Gonçalves, A. Pimentel, E. Fortunato

Proceedings Volume 7940, 79400P (2011) https://doi.org/10.1117/12.879520

KEYWORDS: Transistors, Electronics, Thin films, Electrodes, Capacitance, Oxides, Humidity, Scanning electron microscopy, Electronic components, Prototyping

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Today there is a strong interest in the scientific and industrial community concerning the use of biopolymers for electronic applications, mainly driven by low-cost and disposable applications. Adding to this interest, we must recognize the importance of the wireless auto sustained and low energy consumption electronics dream. This dream can be fulfilled by cellulose paper, the lightest and the cheapest known substrate material, as well as the Earth's major biopolymer and of tremendous global economic importance. The recent developments of oxide thin film transistors and in particular the production of paper transistors at room temperature had contributed, as a first step, for the development of disposable, low cost and flexible electronic devices. To fulfil the wireless demand, it is necessary to prove the concept of self powered devices. In the case of paper electronics, this implies demonstrating the idea of self regenerated thin film paper batteries and its integration with other electronic components. Here we demonstrate this possibility by actuating the gate of paper transistors by paper batteries. We found that when a sheet of cellulose paper is covered in both faces with thin layers of opposite electrochemical potential materials, a voltage appears between both electrodes -paper battery, which is also self-regenerated. The value of the potential depends upon the materials used for anode and cathode. An open circuit voltage of 0.5V and a short-circuit current density of 1μA/cm² were obtained in the simplest structure produced (Cu/paper/Al). For actuating the gate of the paper transistor, seven paper batteries were integrated in the same substrate in series, supplying a voltage of 3.4V. This allows proper ON/OFF control of the paper transistor. Apart from that transparent conductive oxides can be also used as cathode/anode materials allowing so the production of thin film batteries with transparent electrodes compatible with flexible, invisible, self powered and wireless electronics.

Proceedings Article | 15 February 2010 Paper

Floating gate memory paper transistor

R. Martins, L. Pereira, P. Barquinha, N. Correia, G. Gonçalves, I. Ferreira, C. Dias, E. Fortunato

Proceedings Volume 7603, 760314 (2010) https://doi.org/10.1117/12.841036

KEYWORDS: Capacitance, Transistors, Dielectrics, Electrodes, Foam, Indium, Semiconductors, Data modeling, Electrons, Polymers

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Proceedings Article | 12 February 2009 Paper

Zinc oxide and related compounds: order within the disorder

R. Martins, Luisa Pereira, P. Barquinha, I. Ferreira, R. Prabakaran, G. Goncalves, A. Goncalves, E. Fortunato

Proceedings Volume 7217, 72170B (2009) https://doi.org/10.1117/12.816577

KEYWORDS: Oxides, Annealing, Zinc oxide, Semiconductors, Tin, Solar cells, P-type semiconductors, Scanning electron microscopy, Thin films, Refractive index

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Proceedings Article | 12 February 2009 Paper

Paper field effect transistor

E. Fortunato, Nuno Correia, Pedro Barquinha, Cláudia Costa, Luís Pereira, Gonçalo Gonçalves, Rodrigo Martins

Proceedings Volume 7217, 72170K (2009) https://doi.org/10.1117/12.816547

KEYWORDS: Field effect transistors, Oxides, Dielectrics, Semiconductors, Crystals, Transistors, Silicon, Electronics, Thin films, Scanning electron microscopy

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Proceedings Article | 23 January 1997 Paper

Numerical simulation of a/uc-Si:H p-i-n photodiode under nonuniform illumination: a 2D transport problem

Alessandro Fantoni, Manuela Vieira, J. Cruz, Rodrigo Martins

Proceedings Volume 2997, (1997) https://doi.org/10.1117/12.264153

KEYWORDS: Electrons, Absorption, Semiconductors, Microcrystalline materials, Computer simulations, Ions, Sensors, Numerical simulations, Instrument modeling, Crystals

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Proceedings Article | 26 April 1996 Paper

From intelligent materials to smart sensors

Elvira Fortunato, Guilherme Lavareda, Rodrigo Martins, Fernando Soares, Luis Fernandes

Proceedings Volume 2779, (1996) https://doi.org/10.1117/12.237124

KEYWORDS: Sensors, Inspection, Cameras, Resistance, Intelligent sensors, Smart sensors, Thin films, Plasma enhanced chemical vapor deposition, Charge-coupled devices, Glasses

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Proceedings Article | 24 April 1995 Paper

Simulation of the lateral photo effect in large-area 1D a-Si:H p-i-n thin-film position-sensitive detectors

Rodrigo Martins, Elvira Fortunato

Proceedings Volume 2397, (1995) https://doi.org/10.1117/12.206924

KEYWORDS: Diffusion, Electrons, Electrodes, Thin films, Sensors, Distortion, Interfaces, Instrument modeling, Picosecond phenomena, Signal detection

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Proceedings Article | 24 April 1995 Paper

Spatial microscopic/macroscopic control and modeling of the p.i.n devices stability

Alessandro Fantoni, Manuela Vieira, Rodrigo Martins

Proceedings Volume 2397, (1995) https://doi.org/10.1117/12.206917

KEYWORDS: Solar cells, Instrument modeling, Computer simulations, Electron holes, Interfaces, Control systems, Modeling, Device simulation, Electrons, Numerical simulations

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Proceedings Article | 24 April 1995 Paper

High-detection resolution presented by large-area thin-film position-sensitive detectors

Elvira Fortunato, Guilherme Lavareda, Rodrigo Martins, Fernando Soares, Luis Fernandes

Proceedings Volume 2397, (1995) https://doi.org/10.1117/12.206874

KEYWORDS: Sensors, Resistance, Signal detection, Electrodes, Thin films, Diodes, Optoelectronics, Metals, Amorphous silicon, Inspection

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Proceedings Article | 24 April 1995 Paper

Hydrogenated amorphous silicon speed sensor based on the flying spot technique

Manuela Vieira, Alessandro Fantoni, A. Felipe Macarico, Fernando Soares, Rodrigo Martins

Proceedings Volume 2397, (1995) https://doi.org/10.1117/12.206916

KEYWORDS: Sensors, Diffusion, Amorphous silicon, Photovoltaics, Electron holes, Computer simulations, Ordinary differential equations, Light sources, Motion analysis, Material characterization

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Proceedings Article | 10 April 1995 Paper

Linear thin-film position-sensitive detector (LTFPSD) for 3D measurements

Rodrigo Martins, Guilherme Lavareda, Elvira Fortunato, Fernando Soares, Luis Fernandes, Luis Ferreira

Proceedings Volume 2415, (1995) https://doi.org/10.1117/12.206509

KEYWORDS: Sensors, 3D metrology, Inspection, Cameras, Resistance, Thin films, Thin film devices, Plasma enhanced chemical vapor deposition, Glasses, Optoelectronics

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