Exploració per tema "Silicon"

Ara es mostren els items 21-40 de 95

    • Effect of amorphous silicon carbide layer thickness on the passivation quality of crystalline silicon surface 

      Ferré Tomas, Rafel; Martín García, Isidro; Vetter, Michael; Garin Escriva, Moises; Alcubilla González, Ramón (American Institute of Physics, 2005-11-09)
      Article
      Accés restringit per política de l'editorial
      Surface passivation of p-type crystalline silicon wafers by means of phosphorus-doped hydrogenated amorphous silicon carbide films [a-SiCx(n):H] has been investigated. Particularly, we focused on the effects of layer ...

    • Effect of liquid aluminium alloy and ultrasound to corrosion resistance of PVD coating 

      Palau Cruz, Damià (Universitat Politècnica de Catalunya, 2017-01)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      Realitzat a/amb:   Università degli Studi di Brescia
      The aim of the project is resolve the corrosion problems of a steel bar, coating them and study if the coating affects the vibration needed to delate the dendrites of the aluminium alloy due to obtain a globular structure. ...

    • 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 ...

    • Estudio de técnicas de metalización para la fabricación de células solares 

      Parra Santos, Ester (Universitat Politècnica de Catalunya, 2016-06)
      Treball Final de Grau
      Accés obert
      This work is part of two large projects carried out by two researchers from the Polytechnic University of Catalonia, which aim to manufacture Interdigitated Back-Contact silicon solar cells (IBCs) using processes at low ...

    • Estudio reológico de diferentes rutas de formación de geles y sus condiciones 

      Garcia Cabanas, Raquel (Universitat Politècnica de Catalunya, 2024-02-01)
      Projecte Final de Màster Oficial
      Accés restringit per acord de confidencialitat
      Realitzat a/amb:   Zobele España
      Aquest projecte té com a objectiu realitzar un estudi reològic dels gels formats amb sílice pirògena, especialment en el context d'aplicacions de difusió de substàncies volàtils. S'han examinat diverses formulacions amb ...

    • Expanding the perspective of polymeric selective contacts in photovoltaic devices using branched polyethylenimine 

      Ros Costals, Eloi; Tom, Thomas; Rovira Ferrer, David; Lopez Vidrier, Julià; Masmitjà Rusiñol, Gerard; Pusay Villarroel, Benjamín Andrés; Almache Hernández, Rosa Estefanía; Martín García, Isidro; Jiménez Guerra, Maykel; Saucedo Silva, Edgardo Ademar; Tormos, Eva; Asensi López, José Miguel; Ortega Villasclaras, Pablo Rafael; Bertomeu Balagueró, Joan; Puigdollers i González, Joaquim; Voz Sánchez, Cristóbal (American Chemical Society (ACS), 2022-09-05)
      Article
      Accés obert
      This work studies the use of polymeric layers of polyethylenimine (PEI) as an interface modification of electron-selective contacts. A clearly enhanced electrical transport with lower contact resistance and significant ...

    • Experimental and theoretical study of second and third harmonic generation in amorphous silicon 

      Rodríguez Suñé, Laura; Scalora, Michael; Cojocaru, Crina; Akozbek, Neset; Vilaseca Alavedra, Ramon; Trull Silvestre, José Francisco (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      We report contrasted experimental and theoretical results on second and third harmonic generation from an amorphous silicon nanolayer. We perform this study by analysing the harmonic optical signals generated when fs and ...

    • Fabricacion y caracterizacion de guias opticas integradas sobre sustratos de silicio 

      Torner Sabata, Lluís; Alcubilla González, Ramón; Calderer Cardona, Josep (1991)
      Text en actes de congrés
      Accés obert
      Silicon nitride (Si 3 N4 ) planar optical waveguides have been successfully grown by lowpressure chemical vapor deposition (LPCVD). Silicon p-type wafers with a (100) orientation were used as substrates, and the Si3 N4 was ...

    • Fabricación de un sensor solar de alta precisión en dos ejes para el satélite SeoSat 

      Calle Martín, Eric (Universitat Politècnica de Catalunya, 2011-09-06)
      Projecte/Treball Final de Carrera
      Accés obert
      English: The goal of this project is the fabrication of a two axis sun sensor for the attitude control of the SeoSat satellite. This sensor should detect the position of the sun with high accuracy and at an angle FOV (Field ...

    • Fabrication and characterization of in-situ doped a-Si0.8C0.2 emitter bipolar transistors 

      Orpella García, Alberto; Puigdollers i González, Joaquim; Bardés Llorensí, Daniel; Alcubilla González, Ramón; Marsal, L F; Pallarès Marzal, Josep (2000-09)
      Article
      Accés restringit per política de l'editorial
      Silicon–carbon emitters were deposited by plasma enhanced chemical vapour deposition (PECVD) on a conventional silicon transistor base. The resulting transistors were annealed after the emitter had been deposited which led ...

    • Fabrication of c-Si microstructures through reorganization at high temperatures 

      Solà Garcia, Maria Magdalena (Universitat Politècnica de Catalunya, 2015-06)
      Treball Final de Grau
      Accés obert
      Silicon photonics has gained increasing interest in recent years as it promises high performance, cost-effective integrated optical devices. The advent of Si fabrication techniques at the micro and nano-scales, in conjunction ...

    • 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 ...

    • Frequency characterization of a 2.4 GHz CMOS LNA by Thermal Measurements 

      Mateo Peña, Diego; Altet Sanahujes, Josep; Aldrete Vidrio, Héctor; González Jiménez, José Luis (Institute of Electrical and Electronics Engineers (IEEE), 2006)
      Text en actes de congrés
      Accés obert
      This paper presents a technique to obtain electrical characteristics of analog and RF circuits, based on measuring temperature at the silicon surface close to the circuit under test. Experimental results validate the ...

    • Functionalization of silicon carbide by magnetic nanoparticles for tracer uses 

      Parra Carmona, Alejandro (Universitat Politècnica de Catalunya / Université de Technologie Compiègne, 2017-06)
      Projecte Final de Màster Oficial
      Accés obert
      The present work reports a novel and simple way to functionalize commercial silicon carbide with magnetic nanoparticles (Fe3O4). Maghemite and magnetite nanoparticles were synthesized by chemical coprecipitation of FeCl3·6H2O ...

    • Hole transport layers based on ALD V2O5 for silicon solar cells 

      Jabato Caro, Pol (Universitat Politècnica de Catalunya, 2018-06)
      Treball Final de Grau
      Accés obert
      This report summarises research on the use of vanadium (V) oxide films deposited by Atomic Layer Deposition (ALD) for a hole transport layer. Films of vanadium (V) oxide are investigated by looking at their passivation and ...

    • Implementation of a 5x5 trits multiplier in a quasi-adiabatic ternary CMOS logic 

      Mateo Peña, Diego; Rubio Sola, Jose Antonio (Institute of Electrical and Electronics Engineers (IEEE), 1997)
      Text en actes de congrés
      Accés obert
      Adiabatic switching is one technique to design low power digital IC. In order to diminish its expensive silicon area requirements an adiabatic ternary logic is proposed. A 5×5 trits (ternary signals) multiplier has been ...

    • Improved thermal isolation of silicon suspended platforms for an all-silicon thermoelectric microgenerator based on large scale integration of Si nanowires as thermoelectric material 

      Fonseca, L.; Donmez, I.; Salleras, M.; Calaza, C.; Gadea, G.; Santos, J.D.; Morata, A.; Tarancon, A. (2015-12-10)
      Article
      Accés obert
      Special suspended micro-platforms have been designed as a part of silicon compatible planar thermoelectric microgenerators. Bottom-up grown silicon nanowires are going to bridge in the future such platforms to the surrounding ...

    • Improving selective thermal emission properties of three-dimensional macroporous silicon through porosity tuning 

      Garin Escriva, Moises; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Alcubilla González, Ramón; Marquier, F.; Arnold, C.; Greffet, J.-J. (American Institute of Physics, 2008-08-27)
      Article
      Accés restringit per política de l'editorial
      We present a theoretical and experimental study on the effect of progressive porosity increase, through multiple oxidation/oxide removal steps, upon the optical characteristics in threedimensional macroporous silicon. ...

    • Influence of a gold seed in transparent V2Ox/Ag/V2Ox selective contacts for dopant-free silicon solar cells 

      Nguyen, Hieu Trung; Ros Costals, Eloi; Bertomeu Balaguero, Joan; Asensi López, José Miguel; Andreu Batallé, Jordi; Martín García, Isidro; Ortega Villasclaras, Pablo Rafael; Garin Escriva, Moises; Puigdollers i González, Joaquim; Voz Sánchez, Cristóbal; Alcubilla González, Ramón; Tom, Thomas (2018-11-05)
      Article
      Accés obert
      Dielectric/metal/dielectric structures based on vanadium pentoxide with a thin silver interlayer have been optimized to replace traditional transparent electrodes. As would be expected, there is a tradeoff in the metal ...

    • Influence of co-sputtered Ag:Al ultra-thin layers in transparent V2O5/Ag:Al/AZO hole-selective electrodes for silicon solar cells 

      Tom, Thomas; Ros Costals, Eloi; Asensi López, José Miguel; Andreu Batallé, Jordi; Bertomeu Balagueró, Joan; Puigdollers i González, Joaquim; Voz Sánchez, Cristóbal; López-Pintó, Nicolau (Multidisciplinary Digital Publishing Institute (MDPI), 2020-10-31)
      Article
      Accés obert
      As optoelectronic devices continue to improve, control over film thickness has become crucial, especially in applications that require ultra-thin films. A variety of undesired effects may arise depending on the specific ...