The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Julien Perruisseaucarrier - One of the best experts on this subject based on the ideXlab platform.

  • copper and transparent conductor reflectarray elements on thin Film Solar Cell panels
    IEEE Transactions on Antennas and Propagation, 2014
    Co-Authors: Philippe Dreyer, Monica Moralesmasis, Sylvain Nicolay, Christophe Ballif, Julien Perruisseaucarrier
    Abstract:

    This work addresses the task of integrating reflectarray antennas on thin-Film Solar Cell panels, as a means to save real estate, weight or cost of platforms, such as satellites or transportable autonomous antenna systems. Reflectarray unit Cell families, having large phase range, high optical transparency and low microwave loss, are designed to preserve their efficiency in terms of Solar Cell and reflectarray antenna efficiency. Because there is a trade-off between the optical transparency and microwave surface conductivity of a conductor, both standard copper and transparent conductors were considered here. The results obtained at the unit Cell level demonstrate, for the first time, the feasibility of integrating reflectarray on a thin-Film Solar Cell, preserving good performance in terms of both Solar Cell and reflectarray efficiency. For instance, using copper, measurement at X-band demonstrates a phase range larger than 270 with an average microwave loss of 0.25 dB and average optical transparency in the visible spectrum of 85%. Using transparent conductor contributes to better average transparency (90%) at the cost of increase in microwave loss (2.45 dB).

  • copper and transparent conductor reflectarray elements on thin Film Solar Cell panels
    arXiv: Optics, 2013
    Co-Authors: Philippe Dreyer, Monica Moralesmasis, Sylvain Nicolay, Christophe Ballif, Julien Perruisseaucarrier
    Abstract:

    This work addresses the integration of reflectarray antennas (RA) on thin Film Solar Cell (SC) panels, as a mean to save real estate, weight, or cost in platforms such as satellites or transportable autonomous antenna systems. Our goal is to design a good RA unit Cell in terms of phase response and bandwidth, while simultaneously achieving high optical transparency and low microwave loss, to preserve good SC and RA energy efficiencies, respectively. Since there is a trade-off between the optical transparency and microwave surface conductivity of a conductor, here both standard copper and transparent conductors are considered. The results obtained at the unit Cell level demonstrates the feasibility of integrating RA on a thin-Film SC, preserving for the first time good performance in terms of both SC and RA efficiency. For instance, measurement at X-band demonstrate families of Cells providing a phase range larger than 270{\deg} with average microwave loss of -2.45dB (resp. -0.25dB) and average optical transparency in the visible spectrum of 90% (resp. 85%) using transparent conductive multilayer (resp. a copper layer).

Shoichi Nakano - One of the best experts on this subject based on the ideXlab platform.

  • polycrystalline si thin Film Solar Cell prepared by solid phase crystallization spc method
    Solar Energy Materials and Solar Cells, 1994
    Co-Authors: Takao Matsuyama, Toshiaki Baba, Tsuyoshi Takahama, Shinya Tsuda, Shoichi Nakano
    Abstract:

    Abstract The solid phase crystallization (SPC) method has been studied for fabricating polycrystalline (poly) Si thin Films for Solar Cells. The approach was to optimize the “partial doping structure” (nondoped a-Si/phosphorus(P)-doped a-Si) which we proposed as a starting structure before SPC. A conversion efficiency of 6.3% was obtained by using nondoped a-Si with a large structural disorder. This Cell showed a collection efficiency of 51% at a wavelength of 900 nm. In order to significantly reduce the incubation time which is the important factor for the enlargement of the grain size, P doping of more than 1020 cm−3 was required for the P-doped layer.

Philippe Dreyer - One of the best experts on this subject based on the ideXlab platform.

  • copper and transparent conductor reflectarray elements on thin Film Solar Cell panels
    IEEE Transactions on Antennas and Propagation, 2014
    Co-Authors: Philippe Dreyer, Monica Moralesmasis, Sylvain Nicolay, Christophe Ballif, Julien Perruisseaucarrier
    Abstract:

    This work addresses the task of integrating reflectarray antennas on thin-Film Solar Cell panels, as a means to save real estate, weight or cost of platforms, such as satellites or transportable autonomous antenna systems. Reflectarray unit Cell families, having large phase range, high optical transparency and low microwave loss, are designed to preserve their efficiency in terms of Solar Cell and reflectarray antenna efficiency. Because there is a trade-off between the optical transparency and microwave surface conductivity of a conductor, both standard copper and transparent conductors were considered here. The results obtained at the unit Cell level demonstrate, for the first time, the feasibility of integrating reflectarray on a thin-Film Solar Cell, preserving good performance in terms of both Solar Cell and reflectarray efficiency. For instance, using copper, measurement at X-band demonstrates a phase range larger than 270 with an average microwave loss of 0.25 dB and average optical transparency in the visible spectrum of 85%. Using transparent conductor contributes to better average transparency (90%) at the cost of increase in microwave loss (2.45 dB).

  • copper and transparent conductor reflectarray elements on thin Film Solar Cell panels
    arXiv: Optics, 2013
    Co-Authors: Philippe Dreyer, Monica Moralesmasis, Sylvain Nicolay, Christophe Ballif, Julien Perruisseaucarrier
    Abstract:

    This work addresses the integration of reflectarray antennas (RA) on thin Film Solar Cell (SC) panels, as a mean to save real estate, weight, or cost in platforms such as satellites or transportable autonomous antenna systems. Our goal is to design a good RA unit Cell in terms of phase response and bandwidth, while simultaneously achieving high optical transparency and low microwave loss, to preserve good SC and RA energy efficiencies, respectively. Since there is a trade-off between the optical transparency and microwave surface conductivity of a conductor, here both standard copper and transparent conductors are considered. The results obtained at the unit Cell level demonstrates the feasibility of integrating RA on a thin-Film SC, preserving for the first time good performance in terms of both SC and RA efficiency. For instance, measurement at X-band demonstrate families of Cells providing a phase range larger than 270{\deg} with average microwave loss of -2.45dB (resp. -0.25dB) and average optical transparency in the visible spectrum of 90% (resp. 85%) using transparent conductive multilayer (resp. a copper layer).

Rommel Noufi - One of the best experts on this subject based on the ideXlab platform.

  • the state and future prospects of kesterite photovoltaics
    Energy and Environmental Science, 2013
    Co-Authors: Alex Polizzotti, Suhuai Wei, Rommel Noufi, Ingrid Repins, David B Mitzi
    Abstract:

    A recent meeting of experts in kesterite, chalcopyrite, and related thin-Film Solar Cell devices; characterization; and modeling from industry, academia, and national labs identified high-impact pathways forward in kesterite photovoltaics research, towards the end-goal of achieving high-efficiency (>18%) devices in an accelerated timeframe. This paper summarizes the conclusions of this meeting while providing background on key areas of kesterite research. This paper does not aim to provide a comprehensive status-of-the-field review but rather to suggest specific and targeted areas where additional focus might yield the highest-impact results.

  • chemical and electronic surface structure of 20 efficient cu in ga se2 thin Film Solar Cell absorbers
    Applied Physics Letters, 2009
    Co-Authors: Ingrid Repins, Rommel Noufi, L Weinhardt, M A Contreras, C Heske
    Abstract:

    The chemical and electronic surface structure of 20%-efficient Cu(In,Ga)Se2 thin Film Solar Cell absorbers was investigated as a function of deposition process termination (i.e., ending the growth process in absence of either Ga or In). In addition to the expected In (Ga) enrichment, direct and inverse photoemission reveal a decreased Cu surface content and a larger surface band gap for the “In-terminated” absorber.

  • high efficiency thin Film cuin1 xgaxse2 photovoltaic Cells using a cd1 xznxs buffer layer
    Applied Physics Letters, 2006
    Co-Authors: Raghu Nath Bhattacharya, Rommel Noufi, M A Contreras, Brian Egaas, Ana Kanevce, J R Sites
    Abstract:

    The authors have fabricated 19.52% thin-Film CuIn1−xGaxSe2 (CIGS)-based photovoltaic devices using single layer chemical bath deposited Cd1−xZnxS (CdZnS) buffer layer. The efficiency equals the world record for any thin-Film Solar Cell and is achieved with reduced optical absorption in the window layer. Using current-voltage, quantum efficiency, and capacitance-voltage measurements, the CIGS/CdZnS device parameters are directly compared with those of CIGS/CdS devices fabricated with equivalent absorbers.The authors have fabricated 19.52% thin-Film CuIn1−xGaxSe2 (CIGS)-based photovoltaic devices using single layer chemical bath deposited Cd1−xZnxS (CdZnS) buffer layer. The efficiency equals the world record for any thin-Film Solar Cell and is achieved with reduced optical absorption in the window layer. Using current-voltage, quantum efficiency, and capacitance-voltage measurements, the CIGS/CdZnS device parameters are directly compared with those of CIGS/CdS devices fabricated with equivalent absorbers.

  • high efficiency cuinxga1 xse2 Solar Cells made from inx ga1 x 2se3 precursor Films
    Applied Physics Letters, 1994
    Co-Authors: Andrew M Gabor, Rommel Noufi, J R Tuttle, David S Albin, Miguel A Contreras, A M Hermann
    Abstract:

    In, Ga, and Se were coevaporated to form precursor Films of (Inx,Ga1−x)2Se3. The precursors were then converted to CuInxGa1−xSe2 by exposure to a flux of Cu and Se. The final Films were smooth, with tightly packed grains, and had a graded Ga content as a function of Film depth. Photovoltaic devices made from these Films showed good tolerance in device efficiency to variations in Film composition. A device made from these Films resulted in the highest total‐area efficiency measured for any non‐single‐crystal, thin‐Film Solar Cell, at 15.9%.

Karl Johann Jakob Mayrhofer - One of the best experts on this subject based on the ideXlab platform.

  • electrochemical etching of zinc oxide for silicon thin Film Solar Cell applications
    Journal of The Electrochemical Society, 2011
    Co-Authors: Sascha E Pust, Janine Worbs, J Hupkes, Sebasian Oliver Klemm, Karl Johann Jakob Mayrhofer
    Abstract:

    A novel approach is presented for introducing a surface morphology with beneficial light scattering properties to sputterdeposited ZnO:Al Films, being used as front contact in Si thin Film photovoltaic devices. Electrochemical anodization was used to trigger local corrosion, leading to interfacial structures complementary to those commonly prepared by an etching step in diluted HCl. By systematic variation of electrochemical etching conditions and electrolytes, sensible experimental parameters were evaluated for the preparation of ZnO Films that can be applied in Si thin Film Solar Cells. The prepared Films were characterized by scanning electron microscopy, four-point resistance and Hall measurements. Furthermore, the kinetics of the heterogeneous interfacial reaction during the corrosion process were studied utilizing electroanalytical techniques. This allowed the identification of the processes occurring at the solid/liquid interface. Application of such Films in microcrystalline Si single junction Solar Cells has shown promising initial results.