Ara es mostren els items 39-58 de 85

    • Impedance modeling of silica nanoparticle metal insulator metal capacitors 

      Véliz Noboa, Bremnen Marino; Bermejo Broto, Sandra; Orpella García, Alberto; Castañer Muñoz, Luis María (2018-08-01)
      Article
      Accés obert
      In this study, we have fabricated metal-insulator-metal (MIM) capacitors where the insulator layer is made of 255¿nm diameter silica nanospheres. The MIM devices have been characterized and modeled by electrochemical ...
    • Impedance spectroscopy interpretation of silica and polystyrene colloidal suspensions 

      Véliz Noboa, Bremnen Marino; Orpella García, Alberto; Domínguez Pumar, Manuel; Bermejo Broto, Sandra (2020-03-01)
      Article
      Accés obert
      Impedance spectroscopy differences between colloidal 295-nm silica and 300-nm polystyrene nanoparticles in deionized water are analyzed in this work. Using two different two-electrode measurement setups, designed for this ...
    • Improvement of crystalline silicon surface passivation by hidrogen plasma treatment 

      Martín García, Isidro; Vetter, Michael; Orpella García, Alberto; Voz Sánchez, Cristóbal; Puigdollers i González, Joaquim; Alcubilla González, Ramón; Kharchenko, A.V.; Roca i Cabarrocas, Pere (American Institute of Physics, 2004-03-01)
      Article
      Accés restringit per política de l'editorial
      A completely dry low-temperature process has been developed to passivate 3.3 Ωcm p-type crystalline silicon surface with excellent results. Particularly, we have investigated the use of a hydrogen plasma treatment, just ...
    • In-situ doped amorphous Si0.8C0.2 emitter bipolar transistors 

      Orpella García, Alberto; Bardés Llorensí, Daniel; Alcubilla González, Ramón; Marsal, L F; Pallarès Marzal, Josep (1999-11)
      Article
      Accés obert
      The fabrication and characterization of in situ-doped amorphous Si/sub 0.8/C/sub 0.2/ emitter transistors are presented. Emitter Gummel numbers exceeding 10/sup 14/ s/cm/sup 4/ are reported for the first time in this type ...
    • Interdigitated back contacted c-Si(p) solar cells with photovoltaic efficiencies beyond 22% 

      Calle Prado, Eric; Ortega Villasclaras, Pablo Rafael; López Rodríguez, Gema; Martín García, Isidro; Carrió, David; Masmitjà Rusiñol, Gerard; Voz Sánchez, Cristóbal; Orpella García, Alberto; Puigdollers i González, Joaquim; Alcubilla González, Ramón (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work we show a baseline fabrication process of interdigitated back contacted IBC c-Si(p) solar cells, which combines conventional diffusion oven stages to define base p+ and emitter n+/n++ regions at the back side, ...
    • Investigation of the formation of silicon nanocrystals by annealing of amorphous SiCx/c-Si structures 

      Torres, I; Vetter, M; Ferré Burrull, José; Marsal, L F; Orpella García, Alberto; Alcubilla González, Ramón; Pallarès Marzal, Josep (2007-04)
      Article
      Accés restringit per política de l'editorial
      In this work, we study the changes in the optical properties of 300-nm-thick hydrogenated amorphous silicon carbide layers after an annealing process. Both intrinsic and phosphorus-doped amorphous silicon carbide layers ...
    • IR-study of a-SiCx:H and a-SiCxNy:H films for c-Si surface passivation 

      Vetter, Michael; Martín García, Isidro; Orpella García, Alberto; Puigdollers i González, Joaquim; Voz Sánchez, Cristóbal; Alcubilla González, Ramón (2004-03)
      Article
      Accés restringit per política de l'editorial
      Amorphous intrinsic silicon carbide (a-SiCx:H(i)) films and amorphous silicon carbonitride (SiCxNy:H) films have been deposited by plasma enhanced chemical vapor deposition from CH4/SiH4/(N2) plasma on n-type (1.5 O cm) ...
    • Laboratori d'Electrònica i de Física 

      Prat Viñas, Lluís; Benadero García-Morato, Luis; Orpella García, Alberto; Turó Peroy, Antonio; Voz Sánchez, Cristóbal (Universitat Politècnica de Catalunya, 2009)
      Pràctica
      Accés obert
    • Laboratori d'electrònica i física 

      Prat Viñas, Lluís; Benadero García-Morato, Luis; Orpella García, Alberto; Turó Peroy, Antonio; Voz Sánchez, Cristóbal (Universitat Politècnica de Catalunya, 2009)
      Apunts
      Accés obert
    • Laser fired contacts on amorphous silicon deposited by hot-wire cvd on crystalline silicon 

      Blanque, S; Voz Sánchez, Cristóbal; Muñoz Cervantes, Delfina; Martín García, Isidro; Orpella García, Alberto; Puigdollers i González, Joaquim; Alcubilla González, Ramón (WIP Wirtschaft und Infrastruktur GmbH & Co. Planungs-KG, 2008)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work we study aluminium laser-fired contacts for intrinsic amorphous silicon layers deposited by Hot-Wire CVD. This structure could be used as an alternative low temperature back contact for rear passivated ...
    • Laser processing of Al2O3/a-SiCx:H stacks: a feasible solution for the rear surface of high-efficiency p-type c-Si solar cells 

      Martín García, Isidro; Ortega Villasclaras, Pablo Rafael; Colina, Monica; Orpella García, Alberto; López, Gema; Alcubilla González, Ramón (2012-04-26)
      Article
      Accés restringit per política de l'editorial
      We explore the potential of laser processing aluminium oxide (Al2O3)/amorphous silicon carbide (a-SiCx:H) stacks to be used at the rear surface of p-type crystalline silicon (c-Si) solar cells. For this stack, excellent ...
    • Laser-fired contact optimization in c-Si solar cells 

      Alcubilla González, Ramón; Ortega Villasclaras, Pablo Rafael; Orpella García, Alberto; Martín García, Isidro; Colina, M.; López Rodríguez, Gema; Voz Sánchez, Cristóbal; Sánchez, Isabel; Molpeceres, Carlos (2011-04-15)
      Article
      Accés restringit per política de l'editorial
      In this work we study the optimization of laser-fired contact (LFC) processing parameters, namely laser power and number of pulses, based on the electrical resistance measurement of an aluminum single LFC point. LFC process ...
    • Low recombination n+ regions created by n+ c-Si epitaxial layers and laser processing of phosphorus-doped SiCx films 

      Martín García, Isidro; Colina Brito, Mónica Alejandra; Orpella García, Alberto; Voz Sánchez, Cristóbal; De Vecchi, S.; Desrues, T.; Abolmasov, S.; Roca i Cabarrocas, P.; Alcubilla González, Ramón (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
    • Low temperature back-surface-field contacts deposited by hot-wire CVD for heterojunction solar cells 

      Muñoz Cervantes, Delfina; Voz Sánchez, Cristóbal; Martín García, Isidro; Orpella García, Alberto; Alcubilla González, Ramón; Villar, F; Bertomeu Balaguero, Joan; Andreu Batallé, Jordi; Roca-I-Cabarrocas, P (2008-08)
      Article
      Accés obert
      The growing interest in using thinner wafers (< 200 µm) requires the development of low temperature passivation strategies for the back contact of heterojunction solar cells. In this work, we investigate low temperature ...
    • Low-cost high-sensitive suns-Voc measurement instrument to characterize c-Si solar cells 

      Ortega Villasclaras, Pablo Rafael; Piñol, Juan M.; Martín García, Isidro; Orpella García, Alberto; Masmitjà Rusiñol, Gerard; López Rodríguez, Gema; Ros Costals, Eloi; Voz Sánchez, Cristóbal; Puigdollers i González, Joaquim; Alcubilla González, Ramón (2020-09-01)
      Article
      Accés obert
      Measuring open-circuit voltage (Voc) vs. light intensity (Suns) in solar cells permits the access of cell performance without the series resistance effect. This work shows the implementation of a Suns-Voc measurement system ...
    • Microcrystalline silicon thin film transistors obtained by hot-wire CVD 

      Puigdollers i González, Joaquim; Dosev, D; Orpella García, Alberto; Voz Sánchez, Cristóbal; Peiro, D; Bertomeu Balaguero, Joan; Marsal, L F; Pallarés, J; Andreu Batallé, Jordi; Alcubilla González, Ramón (1999-12)
      Article
      Accés restringit per política de l'editorial
      Polysilicon thin film transistors (TFT) are of great interest in the field of large area microelectronics, especially because of their application as active elements in flat panel displays. Different deposition techniques ...
    • N-type emitters passivation through antireflective phosphorus doped a-SiCxNy:H(n) stacks 

      Orpella García, Alberto; Blanqué, Servane; Roiati, V.; Martín García, Isidro; Voz Sánchez, Cristóbal; Puigdollers i González, Joaquim; Alcubilla González, Ramón (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-02-11)
      Text en actes de congrés
      Accés obert
      This paper studies the passivation of industrially textured deep silicon emitters using amorphous silicon carbonitride layers in stack configuration, deposited by plasma enhanced chemical vapor deposition. With this ...
    • N-type PTCDI¿C13H27 thin-film transistors deposited at different substrate temperature 

      Puigdollers i González, Joaquim; Pirriera, Della M; Marsal Vinade, Albert; Orpella García, Alberto; Cheylan, Stephanie; Voz Sánchez, Cristóbal; Alcubilla González, Ramón (2009-10)
      Article
      Accés restringit per política de l'editorial
      N-type organic thin-film transistors based on N,N'-ditridecylperylene-3,4,9,10-tetracarboxylic diimide have been fabricated by thermal evaporation at different substrate temperatures. The best device was obtained at 120 ...
    • Numerical simulations of rear point-contacted solar cells pn 2.2 Wcm p-type c-Si substrates 

      López González, Juan Miguel; Martín García, Isidro; Ortega Villasclaras, Pablo Rafael; Orpella García, Alberto; Alcubilla González, Ramón (2013-07)
      Article
      Accés obert
      Rear surface of high-efficiency crystalline silicon solar cells is based on a combination of dielectric passivation and point-like contacts. In this work, we develop a 3D model for these devices based on 2.2 Ωcm p-type ...
    • Ohmic contacts fabricated on moderately doped p-type GaAs by sputtering deposition and a laser-firing process 

      Boronat Moreiro, Alfredo; Silvestre Bergés, Santiago; Orpella García, Alberto (2013-09-12)
      Article
      Accés obert
      A novel approach is used to achieve ohmic contacts on moderately doped p-type GaAs substrates. A laser-firing process is used instead of the conventional annealing step. The morphology of the crater created by the laser-firing ...