Exploració per tema "Àrees temàtiques de la UPC::Física::Física de l'estat sòlid::Semiconductors"

Ara es mostren els items 1-20 de 50

    • 5GHz CMOS all–pass filter–based true time delay cell 

      Aghazadeh Dafsari, Seyed Rasoul; Martínez García, Herminio; Saberkari, Alireza (2018-12-22)
      Article
      Accés obert
      Analog CMOS time-delay cells realized by passive components, e.g., lumped LC delay lines, are inefficient in terms of area for multi-GHz frequencies. All-pass filters considered as active circuits can, therefore, be the ...

    • Caracterización y ensayos de corrosión de aluminio AA2024-T3 recubierto con polianilina como polímero conductor 

      Català de Haro, Marc (Universitat Politècnica de Catalunya, 2014-02)
      Projecte/Treball Final de Carrera
      Accés obert
      El presente proyecto estudia las propiedades físicas y químicas de un recubrimiento de polianilina, sobre aluminio AA2024-T3, una aleación de aluminio muy utilizada en la industria, el sector de la aviación y el aeroespacial. ...

    • Characterization and application of a-SiCx:H films for the passivation of the c-Si surface 

      Martín Campos, Ignacio Clemente; Vetter, M; Orpella García, Alberto; Puigdollers i González, Joaquim; Voz Sánchez, Cristóbal; Marsal, L F; Pallarès Marzal, Josep; Alcubilla González, Ramón (2002-01)
      Article
      Accés restringit per política de l'editorial
      In this work we investigate the effects of typical thermal treatments on c-Si surface passivation by intrinsic a-SiCx:H films. First, a forming gas anneal (FGA), (400 °C, 30 min in H2/N2) is applied resulting in an improvement ...

    • Closed-loop compensation of charge trapping induced by ionizing radiation in MOS capacitors 

      Domínguez Pumar, Manuel; Bheesayagari, Chenna Reddy; Gorreta Mariné, Sergio; Lopez Chavez, G.; Pons Nin, Joan (Institute of Electrical and Electronics Engineers (IEEE), 2017-08-31)
      Article
      Accés obert
      The objective of this work is to explore the capability of a charge trapping control loop to continuously compensate charge induced by ionizing radiation in the dielectric of MOS capacitors. To this effect, two devices ...

    • Colloidal crystal wires 

      Tymczenko, M; Marsal, L E; Todorov Trifonov, Trifon; Rodriguez, Isabelle; Ramiro-Manzano, F; Pallares, J; Rodríguez Martínez, Ángel; Alcubilla González, Ramón; Meseguer, F (2008-06-18)
      Article
      Accés restringit per política de l'editorial
      Several configurations of colloidal wires are obtained by infiltration of charge-stabilized polystyrene spheres into cylindrical pores of a silicon membrane (see figure). As channel dimensions are comparable to those of ...

    • Crystallographic control at the nanoscale to enhance functionality:polytypic Cu2GeSe3 nanoparticles as thermoelectric materials 

      Ibáñez, María; Zamani, Reza; Li, Wenhua; Cadavid, Doris; Gorsse, Stéphane; Katcho, Nebil A.; Shavel, Alexey; López Martínez, Antonio Miguel; Morante Lleonart, Joan Ramon; Arbiol, Jordi; Cabot, Andreu (2012-11-14)
      Article
      Accés restringit per política de l'editorial
      The potential to control the composition and crystal phase at the nanometer scale enable the production of nanocrystalline materials with enhanced functionalities and new applications. In the present work, we detail a ...

    • Distribution of recombination currents in the space charge of heterostructure bipolar devices 

      Pallares, J; Marsal, L F; Correig, X; Calderer Cardona, Josep; Alcubilla González, Ramón (1998-01)
      Article
      Accés obert
      This paper addresses the problem of the space charge region Shockley-Read-Hall (SRH) recombination currents in heterojunctions with one noncrystalline side. A formulation which generalizes previous works is discussed. The ...

    • Does Sb2Se3 admit nonstoichiometric conditions? How modifying the overall se content affects the structural, optical, and optoelectronic properties of Sb2Se3 thin films 

      Caño Prades, Ivan; Vidal Fuentes, Pedro; Calvo Barrio, Lorenzo; Alcobé Olle, Xavier; Giraldo, Sergio; Sánchez González, Yudania; Jehl Li-Kao, Zacharie; Placidi, Marcel Jose; Puigdollers i González, Joaquim; Izquierdo Roca, Víctor; Saucedo Silva, Edgardo Ademar; Asensi López, José Miguel (2022-03-09)
      Article
      Accés obert
      Sb2Se3 is a quasi-one-dimensional (1D) semiconductor, which has shown great promise in photovoltaics. However, its performance is currently limited by a high Voc deficit. Therefore, it is necessary to explore new strategies ...

    • Efficiency analysis of wide band-gap semiconductors for two-level and three-level power converters 

      Lumbreras Carrasco, David; Zaragoza Bertomeu, Jordi; Mon González, Juan; Gálvez, Eduardo; Collado Escolano, Alfonso (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Comunicació de congrés
      Accés obert
      Power devices based on wide band-gap materials are emerging as alternatives to silicon-based devices. These new devices allow designing and building converters with fewer power losses, and are thus more highly efficient ...

    • Electrical properties of PECVD amorphous silicon-carbon alloys from amorphous-crystalline heterojunctions 

      Marsal Amenós, Félix; Pallarés Viña, Miguel Juan; Correig Blanchar, Francesc Xavier; Domínguez Pumar, Manuel; Bardés Llorensí, Daniel; Calderer Cardona, Josep; Alcubilla González, Ramón (1997-08)
      Article
      Accés restringit per política de l'editorial
      Heterojunction diodes fabricated by plasma enhanced chemical vapour deposition of n-type amorphous silicon carbide on p-type crystalline silicon are analysed by measuring their current-voltage characteristics. Two carrier ...

    • Electronic and structural characterisation of a tetrathiafulvalene compound as a potential candidate for ambipolar transport properties 

      Oton, Francisco; Pfattner, Raphael; Pavlica, Egon; Olivier, Yoann; Bratina, Gvido; Cornil, Jerome; Puigdollers i González, Joaquim; Alcubilla González, Ramón; Fontrodona, Xavier; Mas Torrent, Marta; Veciana Miró, Jaume; Rovira Angulo, Concepció (2011)
      Article
      Accés restringit per política de l'editorial
      We report a joint experimental and theoretical study on the electronic structure and the solid-state organisation of bis(naphthoquinone)-tetrathiafulvalene (BNQ-TTF) as a promising ambipolar semiconductor. Accordingly, ...

    • Electronic properties of intrinsic and doped amorphous silicon carbide films 

      Vetter, Michael; Voz Sánchez, Cristóbal; Ferré Tomas, Rafel; Martín García, Isidro; Orpella García, Alberto; Puigdollers i González, Joaquim; Andreu Batallé, Jordi; Alcubilla González, Ramón (2006-07)
      Article
      Accés restringit per política de l'editorial
      Hydrogenated amorphous silicon carbide (a-SiCx : H) films have shown excellent surface passivation of crystalline silicon. With the aim of large area deposition of these films the influence of the rf plasma power was ...

    • Electronic transport in low temperature nanocrystalline silicon thin-film transistors obtained by hot-wire CVD 

      Puigdollers i González, Joaquim; Voz Sánchez, Cristóbal; Orpella García, Alberto; Martín García, Isidro; Soler Vilamitjana, David; Fonrodona, Marta; Bertomeu Balaguero, Joan; Andreu Batallé, Jordi; Alcubilla González, Ramón (2002-04)
      Article
      Accés restringit per política de l'editorial
      Hydrogenated nanocrystalline silicon (nc-Si:H) obtained by hot-wire chemical vapour deposition (HWCVD) at low substrate temperature (150 °C) has been incorporated as the active layer in bottom-gate thin-film transistors ...

    • Enhancing hydrogen generation in photocatalysis systems by the use of selective contacts 

      Segura Blanch, Oriol (Universitat Politècnica de Catalunya, 2022-06)
      Treball Final de Grau
      Accés restringit per acord de confidencialitat
      Hydrogen stands as a good energy vector to replace fossil fuels due to its high energy density and green production. Moreover, hydrogen can be used to complement other green energy sources. One of the most craved methods ...

    • Experimental and numerical study of the symbolic dynamics of a modulated external-cavity semiconductor laser 

      Aragoneses Aguado, Andrés; Sorrentino Amaral, Taciano; Perrone, Sandro; Gauthier, Daniel; Torrent Serra, Maria del Carmen; Masoller Alonso, Cristina (2014-02-21)
      Article
      Accés obert
      We study the symbolic dynamics of a stochastic excitable optical system with periodic forcing. Specifically, we consider a directly modulated semiconductor laser with optical feedback in the low frequency fluctuations (LFF) ...

    • Fabricación de microfibras de polianilina por la técnica del electrohilado y evaluación de la conductividad en función del grado de dopado 

      Sanin Paz, Marta (Universitat Politècnica de Catalunya / Instituto Politécnico Nacional, 2013)
      Projecte/Treball Final de Carrera
      Accés restringit per decisió de l'autor
      Para la realización del presente estudio se fabricaron microfibras de Polianilina mediante la técnica del electrohilado. Dicha técnica se basa en hacer pasar un fluido a través de una boquilla capilar en presencia de un ...

    • Fabrication and Characterization of Small Molecule Organic Solar Cells 

      Ayele Birhanu, Mulugeta (Universitat Politècnica de Catalunya, 2013-07)
      Projecte Final de Màster Oficial
      Accés obert
      With increasing price of natural gas and petroleum products and their environmental concerns, alternative energy sources are required i.e. renewable energy sources. Solar energy is the abundant form of renewable energy. ...

    • First use of macroporous silicon loaded with catalyst film for a chemical reaction: a microreformer for producing hydrogen from ethanol steam reforming 

      Llorca Piqué, Jordi; Casanovas Grau, Albert; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Alcubilla González, Ramón (2008-04-25)
      Article
      Accés restringit per política de l'editorial
      Macroporous silicon with millions of parallel microchannels per square centimeter can be used as a micromonolithic support for high-speed catalysis in miniaturized systems, opening a new and exciting field of research and ...

    • Fullerene thin-film transistors fabricated on polymeric gate dielectric 

      Puigdollers i González, Joaquim; Voz Sánchez, Cristóbal; Cheylan, Stephanie; Orpella García, Alberto; Vetter, M; Alcubilla González, Ramón (2007-07)
      Article
      Accés restringit per política de l'editorial
      Thin-film transistors with fullerene as n-type organic semiconductor have been fabricated. A polymeric gate dielectric, polymethyl methacrylate, has been used as an alternative to usual inorganic dielectrics. No significant ...

    • Heavy-tailed fluctuations in the spiking output intensity of semiconductor lasers with optical feedback 

      Lan Boon, Leong; Masoller Alonso, Cristina (2016-02-22)
      Article
      Accés obert
      Although heavy-tailed fluctuations are ubiquitous in complex systems, a good understanding of the mechanisms that generate them is still lacking. Optical complex systems are ideal candidates for investigating heavy-tailed ...