15 documents found, page 1 of 2
Cu(In,Ga)Se2 based ultrathin solar cells the pathway from lab rigid to large sc...
Lopes, T. S.; Teixeira, J. P.; Curado, M. A.; Ferreira, B. R.; Oliveira, A. J. N.; Cunha, J. M. V.; Monteiro, M.; Violas, A.; Barbosa, J. R. S.The incorporation of interface passivation structures in ultrathin Cu(In,Ga)Se2 based solar cells is shown. The fabrication used an industry scalable lithography technique—nanoimprint lithography (NIL)—for a 15 × 15 cm2 dielectric layer patterning. Devices with a NIL nanopatterned dielectric layer are benchmarked against electron-beam lithography (EBL) patterning, using rigid substrates. The NIL patterned devic...
Cu(In,Ga)Se2 based ultrathin solar cells the pathway from lab rigid to large sc...
Lopes, T. S.; Teixeira, J. P.; Curado, M. A.; Ferreira, B. R.; Oliveira, A. J. N.; Cunha, J. M. V.; Monteiro, M.; Violas, A.; Barbosa, J. R. S.The incorporation of interface passivation structures in ultrathin Cu(In,Ga)Se2 based solar cells is shown. The fabrication used an industry scalable lithography technique—nanoimprint lithography (NIL)—for a 15 × 15 cm2 dielectric layer patterning. Devices with a NIL nanopatterned dielectric layer are benchmarked against electron-beam lithography (EBL) patterning, using rigid substrates. The NIL patterned devic...
Cu(In,Ga)Se2 based ultrathin solar cells the pathway from lab rigid to large sc...
Lopes, T.S.; Teixeira, J. P.; Curado, M. A.; Ferreira, B. R.; Oliveira, A. J. N.; Cunha, J. M. V.; Monteiro, M.; Violas, A.; Barbosa, J. R. S.The incorporation of interface passivation structures in ultrathin Cu(In,Ga)Se2 based solar cells is shown. The fabrication used an industry scalable lithography technique—nanoimprint lithography (NIL)—for a 15 × 15 cm2 dielectric layer patterning. Devices with a NIL nanopatterned dielectric layer are benchmarked against electron-beam lithography (EBL) patterning, using rigid substrates. The NIL patterned devic...
Field-effect transistors made of graphene grown on recycled copper foils
Machado, G.; Cerqueira, M. F.; Borme, J.; Martins, M.; Gaspar, J.; Alpuim, P.In this paper, recycled low purity copper foils (98%) are tested after a multiple-use process for obtaining singlelayer graphene (SLG). The graphene transfer technique based on water electrolysis (bubbling) is used for the preservation of the Cu foils in multiple graphene deposition cycles. Preliminary cleaning by O2 plasma remove carbon residues from the copper surface. The Cu foils are then cleaned with hydro...
A morphological and electronic study of ultrathin rear passivated Cu(In,Ga)Se2 ...
Bose, S.; Cunha, J.M.V.; Borme, J.; Chen, W.C.; Nilsson, N.S.; Teixeira, J.P.; Gaspar, J.; Leitão, J.P.; Edoff, M.; Fernandes, P. A.; Salomé, P.M.P.The effects of introducing a passivation layer at the rear of ultrathin Copper Indium Gallium di-Selenide Cu(In,Ga)Se2 (CIGS) solar cells is studied. Point contact structures have been created on 25 nm Al2O3 layer using e-beam lithography. Reference solar cells with ultrathin CIGS layers provide devices with average values of light to power conversion efficiency of 8.1% while for passivated cells values reached...
Experimental and theoretical evidences for the ice regime in planar artificial ...
Loreto, R. P.; Gonçalves, R. S.; Pereira, A. R.; Araujo, C. I. L. de; Nascimento, F. S.; Borme, J.; Cezar, J. C.; Nisoli, C.In this work, we explore a kind of geometrical effect in the thermodynamics of artificial spin ices (ASI). In general, such artificial materials are athermal. Here, We demonstrate that geometrically driven dynamics in ASI can open up the panorama of exploring distinct ground states and thermally magnetic monopole excitations. It is shown that a particular ASI lattice will provide a richer thermodynamics with na...
Realization of rectangular artificial spin ice and direct observation of high e...
Ribeiro, Igor Renato Bueno; Nascimento, F. S.; Ferreira Júnior, Silvio da Costa; Melo, Winder Alexander de Moura; Costa, C. A. R.; Borme, J.In this work, we have constructed and experimentally investigated frustrated arrays of dipoles forming two-dimensional artificial spin ices with different lattice parameters (rectangular arrays with horizontal and vertical lattice spacings denoted by a and b respectively). Arrays with three different aspect ratios γ = a/b = 2, 3 and 4 are studied. Theoretical calculations of low-energy demagnetized configuratio...
Rear optical reflection and passivation using a nanopatterned metal/dielectric ...
Lopes, T. S.; Cunha, J. M. V.; Bose, S.; Barbosa, J. R. S.; Borme, J.; Donzel-Gargand, O.; Rocha, C.; Silva, R.; Hultqvist, A.; Chen, W.-C.Currently, one of the main limitations in ultrathin Cu(In,Ga)Se2 (CIGS) solar cells are the optical losses, since the absorber layer is thinner than the light optical path. Hence, light management, including rear optical reflection and light trapping is needed. In this work we focus on increasing the rear optical reflection. For this, a novel structure based on having a metal interlayer in between the Mo rear c...
A morphological and electronic study of ultrathin rear passivated Cu(In,Ga)Se2 ...
Bose, S.; Cunha, J. M. V.; Borme, J.; Chen, W. C.; Nilsson, N. S.; Teixeira, J. P.; Gaspar, J.; Leitão, J. P.; Edoff, M.; Fernandes, P. A.The effects of introducing a passivation layer at the rear of ultrathin Copper Indium Gallium di-Selenide Cu(In,Ga)Se2 (CIGS) solar cells is studied. Point contact structures have been created on 25 nm Al2O3 layer using e-beam lithography. Reference solar cells with ultrathin CIGS layers provide devices with average values of light to power conversion efficiency of 8.1 % while for passivated cells values reache...
Realization of rectangular artificial spin Ice and direct observation of high e...
Ribeiro, I. R. B.; Nascimento, F. S.; Ferreira, S. O.; Moura-Melo, W. A.; Costa, C. A. R.; Borme, J.; Freitas, P. P.; Wysin, G. M.; Araujo, C. I. L. deIn this work, we have constructed and experimentally investigated frustrated arrays of dipoles forming two-dimensional artificial spin ices with different lattice parameters (rectangular arrays with horizontal and vertical lattice spacings denoted by a and b respectively). Arrays with three different aspect ratios γ = a/b = 2‾√, 3‾√ and 4‾√ are studied. Theoretical calculations of low-energy demagnetized config...