Now showing items 21-40 of 76

    • 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
      Restricted access - publisher's policy
      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)
      Bachelor thesis
      Open Access
      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
      Restricted access - publisher's policy
      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 ...
    • Functionalization of silicon carbide by magnetic nanoparticles for tracer uses 

      Parra Carmona, Alejandro (Universitat Politècnica de Catalunya / Université de Technologie Compiègne, 2017-06)
      Master thesis
      Open Access
      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)
      Bachelor thesis
      Open Access
      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 ...
    • 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
      Open Access
      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
      Restricted access - publisher's policy
      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
      Open Access
      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
      Open Access
      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 ...
    • Influence of Si substitution on the reactivity of a-tricalcium phosphate 

      Motisuke, Mariana; Mestres, Gemma; Renó, Caroline O.; Carrodeguas, Raúl G.; Zavaglia, Cecilia; Ginebra Molins, Maria Pau (Elsevier, 2017-06-01)
      Article
      Open Access
      Silicon substituted calcium phosphates have been widely studied over the last ten years due to their enhanced osteogenic properties. Notwithstanding, the role of silicon on a-TCP reactivity is not clear yet. Therefore, the ...
    • Infrared thermal emission in macroporous silicon three-dimensional photonic crystals 

      Garin Escriva, Moises; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Alcubilla González, Ramón (2007-10)
      Article
      Open Access
      In this paper we investigate the infrared thermal emission properties of macroporous silicon with modulated pore diameter. Samples with different pore modulation periodicities but fixed in-plane lattice constant are ...
    • Investigation of Cathodoluminescence emission from Si and Au/Si nanostructures 

      Vila Gracia, Yago Nel (Universitat Politècnica de Catalunya, 2017-06)
      Bachelor thesis
      Open Access
      Covenantee:   King's College London
      Both high refractive index dielectric and plasmonic materials have proved being able to confine and direct light in the nanoscale. Thus, a complete investigation and comprehension of the plasmonic and optical excitation ...
    • iRMW: A low-cost technique to reduce NBTI-dependent parametric failures in L1 data caches 

      Ganapathy, Shrikanth; Canal Corretger, Ramon; González Colás, Antonio María; Rubio Sola, Jose Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Open Access
      Negative bias temperature instability (NBTI) is a major cause of concern for chip designers because of its inherent ability to drastically reduce silicon reliability over the lifetime of the processor. Coupled with statistical ...
    • Larger absolute photonic bandgap in two-dimensional air-silicon structures 

      Marsal, L F; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Pallarés, J; Alcubilla González, Ramón (2003-05)
      Article
      Restricted access - publisher's policy
      We investigate different aspects of the absolute photonic band gap (PBG) formation for two-dimensional photonic crystals, consisting of air rods drilled into silicon. Specifically, square lattices of square and circular ...
    • Macroporous silicon FET transistors for power applications 

      Vega, Didac; Najar, R.; Pina, Maria; Rodríguez Martínez, Ángel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      In this paper we propose the use of macroporous silicon for microelectronic devices. We propose and study four different FET transistor structures using macroporous silicon as base material. Macroporous silicon is a ...
    • Macroporous silicon microreactor for the preferential oxidation of CO 

      Divins, N.J.; López, E.; Llorca, J.; Vega, Didac; Rodríguez Martínez, Ángel; González de Rivera, F.; Angurell, I.; Seco, M.; Rossell, O. (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      A macroporous silicon micromonolith containing ca. 40,000 regular channels of 3.3 μm in diameter per square millimeter has been successfully functionalized with an Au/TiO2 catalyst for CO preferential oxidation (CO-PrOx) ...
    • Macroporous silicon photonic crystals for gas sensing 

      Vega, Didac; Reina, Jordi; Rodríguez Martínez, Ángel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      In this paper we study a compact gas sensor based on a photonic crystal built from macroporous silicon. Its sensing mechanism is based in the absorption of infrared light by a gas. Photonic crystals are structured materials ...
    • Macroporous silicon. Technology and applications 

      Vega Bru, Didac; Rodríguez Martínez, Ángel (InTech - Open science/Open minds, 2017-06)
      Part of book or chapter of book
      Open Access
      The knowledge of fundamental silicon questions and all aspects of silicon technology gives the possibility of improvement to both initial silicon material and devices on silicon basis. The articles for this book have been ...
    • Macroporous silicon: a versatile material for 3D structure fabrication 

      Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Marsal, L F; Pallares, J; Alcubilla González, Ramón (2008-02)
      Article
      Restricted access - publisher's policy
      This work focuses on the fabrication of three-dimensional (3D) microstructures by electrochemical etching of n-type silicon. We exploit the possibility of modulating the pore diameter along the growing direction to produce ...
    • Macroporous silicon: efficient antireflective layer on crystalline silicon 

      Fonthal Rico, Faruk; Torres, Ivaldo; Rodríguez Martínez, Ángel (2011-07)
      Article
      Restricted access - publisher's policy
      A macroporous silicon layer (ma-PS) electrochemically grown on crystalline silicon surface can be used as an efficient antireflective layer in optical devices as antireflection coating. In this work, we presented the ma-PS ...