The Experts below are selected from a list of 56781 Experts worldwide ranked by ideXlab platform
A.n Tiwari - One of the best experts on this subject based on the ideXlab platform.
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high efficiency polycrystalline thin film tandem solar Cells
Journal of Physical Chemistry Letters, 2015Co-Authors: Lukas Kranz, Antonio Abate, Thomas Feurer, Enrico Avancini, Johannes Lockinger, Patrick Reinhard, Shaik M Zakeeruddin, Stephan Buecheler, A.n TiwariAbstract:A promising way to enhance the efficiency of CIGS solar Cells is by combining them with perovskite solar Cells in tandem devices. However, so far, such tandem devices had limited efficiency due to challenges in developing NIR-transparent perovskite top Cells, which allow photons with energy below the perovskite band gap to be transmitted to the Bottom Cell. Here, a process for the fabrication of NIR-transparent perovskite solar Cells is presented, which enables power conversion efficiencies up to 12.1% combined with an average sub-band gap transmission of 71% for photons with wavelength between 800 and 1000 nm. The combination of a NIR-transparent perovskite top Cell with a CIGS Bottom Cell enabled a tandem device with 19.5% efficiency, which is the highest reported efficiency for a polycrystalline thin film tandem solar Cell. Future developments of perovskite/CIGS tandem devices are discussed and prospects for devices with efficiency toward and above 27% are given.
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analysis of electronic and optical losses in cu in ga se2 dye sensitized Cell tandem solar Cells
Energy Procedia, 2010Co-Authors: S Seyrling, Sophie Wenger, A.n TiwariAbstract:Abstract To optimize dual junction solar Cells using a dye-sensitized Cell (DSC) as top Cell and a Cu(In,Ga)Se2 (CIGS) Cell as Bottom Cell, both optical and electronic loss mechanisms were investigated. The light absorption and optical losses in various layers were investigated through transmission measurements, and the amount of light available for photogeneration of charge carriers was determined. From the measured light balance, a maximum possible current for the Cells was estimated. I-V curves of stacked solar Cells were analyzed to investigate possible electronic loss mechanisms. From the results gained in these measurements, conclusions about the limiting factors and potential optimizations in DSC/CIGS tandem solar Cells could be drawn. Calculations showed that current densities up to 20 mAcm−2 can be generated in a CIGS Bottom Cell with the light transmitted from the DSC. This would correspond to an efficiency exceeding 20%, given that highly transmitting DSCs yielding such high currents can be provided.
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nanocrystalline dye sensitized solar Cell copper indium gallium selenide thin film tandem showing greater than 15 conversion efficiency
Applied Physics Letters, 2006Co-Authors: Paul Liska, K. Ravindranathan Thampi, David Bremaud, H M Upadhyaya, Dg Rudmann, Michael Gratzel, A.n TiwariAbstract:Multijunction stacked (tandem) solar Cells can increase the overall photovoltaic conversion efficiency by optimal utilization of the solar spectrum in individual Cells. We demonstrate that a photovoltaic tandem Cell comprising a nanocrystalline dye-sensitized solar Cell as a top Cell for high-energy photons and a copper indium gallium selenide thin-film Bottom Cell for lower-energy photons produces AM 1.5 solar to electric conversion efficiencies greater than 15%.
Christophe Ballif - One of the best experts on this subject based on the ideXlab platform.
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25 1 efficient monolithic perovskite silicon tandem solar Cell based on a p type monocrystalline textured silicon wafer and high temperature passivating contacts
ACS energy letters, 2019Co-Authors: Gizem Nogay, Mathieu Boccard, Florent Sahli, Jeremie Werner, Raphael Monnard, Matthieu Despeisse, Franzjosef Haug, Quentin Jeangros, Andrea Ingenito, Christophe BallifAbstract:A monolithic two-terminal perovskite/silicon tandem solar Cell based on an industrial, high-temperature tolerant p-type crystalline silicon Bottom Cell with a steady-state power conversion efficiency of 25.1% is demonstrated.
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High-Stable-Efficiency Tandem Thin-Film Silicon Solar Cell With Low-Refractive-Index Silicon-Oxide Interlayer
IEEE Journal of Photovoltaics, 2014Co-Authors: Mathieu Boccard, Jordi Escarré, Grégory Bugnon, Matthieu Despeisse, Xavier Niquille, Simon Hänni, Maximilien Bonnet-eymard, Fanny Meillaud, Christophe BallifAbstract:We report the recent advances and key requirements for high-efficiency “micromorph” tandem thin-film silicon solar Cells composed of an amorphous silicon top Cell and a microcrystalline silicon Bottom Cell. The impact of inserting a low-refractive-index silicon-oxide (SiOx) film as intermediate reflecting layer (IRL) is highlighted. We show that refractive indexes as low as 1.75 can be obtained for layers still conducting enough to be implemented in solar Cells, and without no additional degradation. This allows for high top-Cell current densities with thin top Cells, enabling low degradation rates. A micromorph Cell with a certified efficiency of 12.63% (short-circuit current density of 12.8 mA/cm2) is obtained for an optimized stack. Furthermore, short-circuit current densities as high as 15.9 mA/cm2 are reported in the amorphous silicon top-Cell of micromorph devices by combining a 150-nm-thick SiOx-based IRL and a textured antireflecting coating at the air-glass interface.
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in situ silicon oxide based intermediate reflector for thin film silicon micromorph solar Cells
Applied Physics Letters, 2007Co-Authors: P Buehlmann, Adrian Billet, J Bailat, D Domine, F Meillaud, A Feltrin, Christophe BallifAbstract:We show that SiO-based intermediate reflectors (SOIRs) can be fabricated in the same reactor and with the same process gases as used for thin-film silicon solar Cells. By varying input gas ratios, SOIR layers with a wide range of optical and electrical properties are obtained. The influence of the SOIR thickness in the micromorph Cell is studied and current gain and losses are discussed. Initial micromorph Cell efficiency of 12.2% (Voc=1.40V, fill factor=71.9%, and Jsc=12.1mA∕cm2) is achieved with top Cell, SOIR, and Bottom Cell thicknesses of 270, 95, and 1800nm, respectively.
Mathieu Boccard - One of the best experts on this subject based on the ideXlab platform.
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25 1 efficient monolithic perovskite silicon tandem solar Cell based on a p type monocrystalline textured silicon wafer and high temperature passivating contacts
ACS energy letters, 2019Co-Authors: Gizem Nogay, Mathieu Boccard, Florent Sahli, Jeremie Werner, Raphael Monnard, Matthieu Despeisse, Franzjosef Haug, Quentin Jeangros, Andrea Ingenito, Christophe BallifAbstract:A monolithic two-terminal perovskite/silicon tandem solar Cell based on an industrial, high-temperature tolerant p-type crystalline silicon Bottom Cell with a steady-state power conversion efficiency of 25.1% is demonstrated.
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micromorph silicon solar Cell optical performance influence of intermediate reflector and front electrode surface texture
Solar Energy Materials and Solar Cells, 2014Co-Authors: Andrej Campa, Mathieu Boccard, Janez Krč, Chao Zhang, Matthias Meier, L V Mercaldo, M Ghosh, T Merdzhanova, F J HaugAbstract:The optical performance of tandem a-Si:H/mu c-Si:H (micromorph) thin film solar Cell was investigated experimentally and by means of rigorous 3-D optical simulation. The interplay of intermediate reflectors, with different refractive indices and thicknesses, and front electrode surface texture was studied. Experiments and simulations show that LPCVD ZnO based front electrodes have the highest optical potential together with a low refractive index of the intermediate reflector. The intermediate reflector layer serves for redistribution of the mid-range solar spectrum between the top and Bottom Cell, while the sum of the top and Bottom Cell currents decreases with increasing IRL thickness. Additionally, promising concepts to increase the short-circuit current of the tandem solar Cell are shown. The most important steps are related to lowering parasitic absorption in supportive layers by the introduction of silicon oxide layers and improving the light incoupling by introduction of anti-reflective layers. (C) 2014 Elsevier B.V. All rights reserved.
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High-Stable-Efficiency Tandem Thin-Film Silicon Solar Cell With Low-Refractive-Index Silicon-Oxide Interlayer
IEEE Journal of Photovoltaics, 2014Co-Authors: Mathieu Boccard, Jordi Escarré, Grégory Bugnon, Matthieu Despeisse, Xavier Niquille, Simon Hänni, Maximilien Bonnet-eymard, Fanny Meillaud, Christophe BallifAbstract:We report the recent advances and key requirements for high-efficiency “micromorph” tandem thin-film silicon solar Cells composed of an amorphous silicon top Cell and a microcrystalline silicon Bottom Cell. The impact of inserting a low-refractive-index silicon-oxide (SiOx) film as intermediate reflecting layer (IRL) is highlighted. We show that refractive indexes as low as 1.75 can be obtained for layers still conducting enough to be implemented in solar Cells, and without no additional degradation. This allows for high top-Cell current densities with thin top Cells, enabling low degradation rates. A micromorph Cell with a certified efficiency of 12.63% (short-circuit current density of 12.8 mA/cm2) is obtained for an optimized stack. Furthermore, short-circuit current densities as high as 15.9 mA/cm2 are reported in the amorphous silicon top-Cell of micromorph devices by combining a 150-nm-thick SiOx-based IRL and a textured antireflecting coating at the air-glass interface.
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Nanoimprint lithography for high-efficiency thin-film silicon solar Cells
Nano Letters, 2011Co-Authors: Corsin Battaglia, Kerstin Söderström, Lukas Erni, Laura Ding, Jordi Escarré, Adrian Billet, Grégory Bugnon, Loris Barraud, Mathieu Boccard, Stefaan De WolfAbstract:We demonstrate high-efficiency thin-film silicon solar Cells with transparent nanotextured front electrodes fabricated via ultraviolet nanoimprint lithography on glass substrates. By replicating the morphology of state-of-the-art nanotextured zinc oxide front electrodes known for their exceptional light trapping properties, conversion efficiencies of up to 12.0% are achieved for micromorph tandem junction Cells. ExCellent light incoupling results in a remarkable summed short-circuit current density of 25.9 mA/cm(2) for amorphous top Cell and microcrystalline Bottom Cell thicknesses of only 250 and 1100 nm, respectively. As efforts to maximize light harvesting continue, our study validates nanoimprinting as a versatile tool to investigate nanophotonic effects of a large variety of nanostructures directly on device performance.
Stefaan De Wolf - One of the best experts on this subject based on the ideXlab platform.
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organic inorganic halide perovskite crystalline silicon four terminal tandem solar Cells
Physical Chemistry Chemical Physics, 2015Co-Authors: Philipp Loper, Soojin Moon, Silvia Martin De Nicolas, Bjoern Niesen, Martin Ledinsky, Sylvain Nicolay, J Bailat, Junho Yum, Stefaan De WolfAbstract:Tandem solar Cells constructed from a crystalline silicon (c-Si) Bottom Cell and a low-cost top Cell offer a promising way to ensure long-term price reductions of photovoltaic modules. We present a four-terminal tandem solar Cell consisting of a methyl ammonium lead triiodide (CH3NH3PbI3) top Cell and a c-Si heterojunction Bottom Cell. The CH3NH3PbI3 top Cell exhibits broad-band transparency owing to its design free of metallic components and yields a transmittance of >55% in the near-infrared spectral region. This allows the generation of a short-circuit current density of 13.7 mA cm−2 in the Bottom Cell. The four-terminal tandem solar Cell yields an efficiency of 13.4% (top Cell: 6.2%, Bottom Cell: 7.2%), which is a gain of 1.8%abs with respect to the reference single-junction CH3NH3PbI3 solar Cell with metal back contact. We employ the four-terminal tandem solar Cell for a detailed investigation of the optical losses and to derive guidelines for further efficiency improvements. Based on a power loss analysis, we estimate that tandem efficiencies of ∼28% are attainable using an optically optimized system based on current technology, whereas a fully optimized, ultimate device with matched current could yield up to 31.6%.
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Nanoimprint lithography for high-efficiency thin-film silicon solar Cells
Nano Letters, 2011Co-Authors: Corsin Battaglia, Kerstin Söderström, Lukas Erni, Laura Ding, Jordi Escarré, Adrian Billet, Grégory Bugnon, Loris Barraud, Mathieu Boccard, Stefaan De WolfAbstract:We demonstrate high-efficiency thin-film silicon solar Cells with transparent nanotextured front electrodes fabricated via ultraviolet nanoimprint lithography on glass substrates. By replicating the morphology of state-of-the-art nanotextured zinc oxide front electrodes known for their exceptional light trapping properties, conversion efficiencies of up to 12.0% are achieved for micromorph tandem junction Cells. ExCellent light incoupling results in a remarkable summed short-circuit current density of 25.9 mA/cm(2) for amorphous top Cell and microcrystalline Bottom Cell thicknesses of only 250 and 1100 nm, respectively. As efforts to maximize light harvesting continue, our study validates nanoimprinting as a versatile tool to investigate nanophotonic effects of a large variety of nanostructures directly on device performance.
Paul Stradins - One of the best experts on this subject based on the ideXlab platform.
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outdoor performance of a tandem ingap si photovoltaic luminescent solar concentrator
Solar Energy Materials and Solar Cells, 2021Co-Authors: Megan Phelan, San Theingi, Ognjen Ilic, Colton R Bukowsky, David R Needell, Haley Bauser, Michael G Deceglie, Brent A Koscher, Zach Nett, Paul StradinsAbstract:Abstract We report the design, fabrication and outdoor characterization of a tandem luminescent solar concentrator/Si multi-junction photovoltaic module. Our tandem LSC/Si device consists of an InGaP LSC functioning as a top Cell and a passivated contact Si Bottom Cell. The LSC comprises of an InGaP microCell array coupled to a polymer waveguide, loaded with CdSe/CdS core-shell quantum dot luminophores. The light trapping efficiency of the LSC waveguide is enhanced by encapsulation with photoluminescence trapping mirrors consisting of dielectric multilayer thin films. We demonstrate the performance of the LSC/Si device through a series of outdoor tests under various irradiance conditions conducted at the National Renewable Energy Laboratory. We report the first outdoor testing data of an LSC/Si tandem module, displaying maintained performance across varied diffusivity conditions for the LSC component. Finally, we model the tandem module performance using a ray optic simulation-based multiphysics model and forecast a pathway for high efficiency tandem LSC/Si module performance.
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luminescent solar concentrator tandem on silicon with above 700mv passivated contact silicon Bottom Cell
Photovoltaic Specialists Conference, 2019Co-Authors: San Theingi, J F Geisz, Paul Stradins, Ognjen Ilic, Colton R Bukowsky, Ralph G Nuzzo, Paul A Alivisatos, Harry A Atwater, David R Needell, Haley BauserAbstract:Luminescent solar concentrator (LSC) tandem-on-silicon (Si) provides a route towards achieving higher than 30% overall efficiency which can overcome the theoretical efficiency limit of a single junction Si Cell. Here, we present optical coupling and performance of high V oc passivated contact Si Bottom Cell for LSC tandem-on-Si where the top module consists of highly efficient luminophores and an array of micro InGaP Cells embedded in a poly (lauryl methacrylate) waveguide. In this device configuration, InGaP Cell area coverage is only ~0.5% of the total LSC area which significantly reduces the high cost III-V material usage. The performance of Si sub-Cell is investigated under LSC spectrum and is compared against the measurement done under 1 μm thick InGaP filter which mimics the spectrum seen by Si Bottom Cell in a conventional III-V/Si tandem. V oc of greater than 700 mV has been observed for the passivated contact Si Bottom Cell in these tandem applications.
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progress towards a 30 efficient gainp si tandem solar Cell
Energy Procedia, 2015Co-Authors: Stephanie Essig, Myles A Steiner, Scott Ward, D J Friedman, J F Geisz, Paul Stradins, David L YoungAbstract:Abstract The performance of dual-junction solar Cells with a Si Bottom Cell has been investigated both theoretically and experimentally. Simulations show that adding a top junction with an energy bandgap of 1.6 -1.9 eV to a standard silicon solar Cell enables efficiencies over 38%. Currently, top junctions of GaInP (1.8 eV) are the most promising as they can achieve 1-sun efficiencies of 20.8% [1]. We fabricated mechanically stacked, four terminal GaInP/Si tandem solar Cells using a transparent adhesive between the subCells. These tandem devices achieved an efficiency of 27% under AM1.5 g spectral conditions. Higher efficiencies can be achieved by using an improved Si-Bottom Cell and by optimizing the dual-junction device for long-wavelength light and luminescent coupling between the two junctions.