Solar Cells

14,000,000 Leading Edge Experts on the ideXlab platform

Scan Science and Technology

Contact Leading Edge Experts & Companies

Scan Science and Technology

Contact Leading Edge Experts & Companies

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

Christoph J. Brabec - One of the best experts on this subject based on the ideXlab platform.

  • organic ternary Solar Cells a review
    Advanced Materials, 2013
    Co-Authors: Tayebeh Ameri, Parisa Khoram, Jie Min, Christoph J. Brabec
    Abstract:

    Recently, researchers have paid a great deal of attention to the research and development of organic Solar Cells, leading to a breakthrough of over 10% power conversion efficiency. Though impressive, further development is required to ensure a bright industrial future for organic photovoltaics. Relatively narrow spectral overlap of organic polymer absorption bands within the Solar spectrum is one of the major limitations of organic Solar Cells. Among different strategies that are in progress to tackle this restriction, the novel concept of ternary organic Solar Cells is a promising candidate to extend the absorption spectra of large bandgap polymers to the near IR region and to enhance light harvesting in single bulk-heterojunction Solar Cells. In this contribution, we review the recent developments in organic ternary Solar cell research based on various types of sensitizers. In addition, the aspects of miscibility, morphology complexity, charge transfer dynamics as well as carrier transport in ternary organic composites are addressed.

  • highly efficient organic tandem Solar Cells a follow up review
    Energy and Environmental Science, 2013
    Co-Authors: Tayebeh Ameri, Christoph J. Brabec
    Abstract:

    Multi-junction Solar cell configurations, where two or further sub-Cells with complementary absorption are stacked and connected in series or parallel, offer an exciting approach to tackle the single junction limitations of organic Solar Cells and further improve their power conversion efficiency. In this article we aim to follow up our previous work and review the most important and novel developments that have been recently reported on organic tandem Solar Cells. In addition, some brief theoretical considerations addressing the potential of single and tandem Solar Cells, the working principles of the intermediate layer, the importance and benefits of optical simulations and finally the intricacies of a precise performance measurement of bulk-heterojunction organic tandem Solar Cells based on complementary absorber materials are presented.

  • organic tandem Solar Cells a review
    Energy and Environmental Science, 2009
    Co-Authors: Tayebeh Ameri, Gilles Dennler, Christoph Lungenschmied, Christoph J. Brabec
    Abstract:

    In this article some brief theoretical considerations addressing the potential of single and tandem Solar Cells, the main experimental achievements reported in the literature so far and finally some design rules for efficient material combinations in bulk-heterojunction organic tandem Solar Cells are presented.

  • Printing highly efficient organic Solar Cells
    Nano Letters, 2008
    Co-Authors: Claudia N. Hoth, Pavel Schilinsky, Stelios A Choulis, Christoph J. Brabec
    Abstract:

    The technological attraction in organic Solar Cells is their compatibility to printing processes. However, up to today, nearly no literature on "printed" organic Solar Cells have been published and the major body of the research work was done by spin coating or blading techniques. Transferring the spin-coating or doctor blading process currently used for the fabrication of bulk heterojunction Solar cell to a printing process holds morphological challenges that have not been observed or reported up to today. We highlight these challenges and we show that inkjet printing of organic bulk heterojunction Solar Cells requires completely novel approaches and skill sets compared to the current state of the art. By adjusting the chemical properties of the poly(3-hexylthiophene) polymer donor and by using our recently developed inkjet solvent mixture, we have gained control over the nanomorphology of poly(3-hexylthiophene):fullerene blends during the printing process and report a new record power conversion efficiency of 3.5% for inkjet printed poly(3-hexylthiophene):fullerene based Solar Cells.

Gerrit Boschloo - One of the best experts on this subject based on the ideXlab platform.

  • Characterization techniques for dye-sensitized Solar Cells
    Energy & Environmental Science, 2017
    Co-Authors: Meysam Pazoki, Anders Hagfeldt, Ute B. Cappel, Erik M. J. Johansson, Gerrit Boschloo
    Abstract:

    Dye-sensitized Solar Cells (DSCs) have been widely studied in the last two decades and start to be commercialized in the photovoltaic market. Comprehensive characterization is needed to fully understand and optimize the device performance and stability. In this review, we summarize different characterization methods for dye-sensitized Solar Cells with liquid redox electrolytes or solid state hole transporting materials, most of which can also be used for similar devices such as perovskite based thin film Solar Cells. Limitations and advantages of relevant methods for studying the energy levels and time scales involved in charge transfer processes as well as charge transport related characteristic lengths are discussed. A summary of recent developments in DSCs and the importance of measured parameters for the device optimization procedure are mentioned at the end.

  • carbazole based hole transport materials for efficient solid state dye sensitized Solar Cells and perovskite Solar Cells
    Advanced Materials, 2014
    Co-Authors: Esmaeil Sheibani, Peng Liu, Jinbao Zhang, Haining Tian, Nick Vlachopoulos, Gerrit Boschloo, Lars Kloo, Anders Hagfeldt, Licheng Sun
    Abstract:

    (Graph Presented) Two carbazole-based small molecule hole-transport materials (HTMs) are synthesized and investigated in solid-state dye-sensitized Solar Cells (ssDSCs) and perovskite Solar Cells ( ...

J A Rand - One of the best experts on this subject based on the ideXlab platform.

  • silicon nanowire Solar Cells
    Applied Physics Letters, 2007
    Co-Authors: L Tsakalakos, J Balch, Jody Fronheiser, B A Korevaar, O Sulima, J A Rand
    Abstract:

    Over the past decade, silicon nanowire Solar Cells have been intensively explored as potential platforms for the next-generation photovoltaic (PV) technologies with high power conversion efficiency and low production cost. This chapter discusses the details of the silicon nanowire Solar Cells in terms of their device structures, fabrication and characterization, electrical and optical properties benefited from the nanowire geometry. These benefits are not only expected to increase the power conversion efficiency, but also considered to reduce the requirement for the material quantity and quality, allowing for potential efficiency improvements and substantial cost reductions.

  • silicon nanowire Solar Cells
    Applied Physics Letters, 2007
    Co-Authors: L Tsakalakos, J Balch, Jody Fronheiser, B A Korevaar, O Sulima, J A Rand
    Abstract:

    Silicon nanowire-based Solar Cells on metal foil are described. The key benefits of such devices are discussed, followed by optical reflectance, current-voltage, and external quantum efficiency data for a cell design employing a thin amorphous silicon layer deposited on the nanowire array to form the p-n junction. A promising current density of ∼1.6mA∕cm2 for 1.8cm2 Cells was obtained, and a broad external quantum efficiency was measured with a maximum value of ∼12% at 690nm. The optical reflectance of the silicon nanowire Solar Cells is reduced by one to two orders of magnitude compared to planar Cells.

Licheng Sun - One of the best experts on this subject based on the ideXlab platform.

Henry J Snaith - One of the best experts on this subject based on the ideXlab platform.

  • Hybrid Perovskites: Prospects for Concentrator Solar Cells
    Advanced Science, 2018
    Co-Authors: Qianqian Lin, Michael B Johnston, Henry J Snaith, Zhiping Wang, Laura M Herz
    Abstract:

    Perovskite Solar Cells have shown a meteoric rise of power conversion efficiency and a steady pace of improvements in their stability of operation. Such rapid progress has triggered research into approaches that can boost efficiencies beyond the Shockley–Queisser limit stipulated for a single-junction cell under normal Solar illumination conditions. The tandem Solar cell architecture is one concept here that has recently been successfully implemented. However, the approach of Solar concentration has not been sufficiently explored so far for perovskite photovoltaics, despite its frequent use in the area of inorganic semiconductor Solar Cells. Here, the prospects of hybrid perovskites are assessed for use in concentrator Solar Cells. Solar cell performance parameters are theoretically predicted as a function of Solar concentration levels, based on representative assumptions of charge-carrier recombination and extraction rates in the device. It is demonstrated that perovskite Solar Cells can fundamentally exhibit appreciably higher energy-conversion efficiencies under Solar concentration, where they are able to exceed the Shockley–Queisser limit and exhibit strongly elevated open-circuit voltages. It is therefore concluded that sufficient material and device stability under increased illumination levels will be the only significant challenge to perovskite concentrator Solar cell applications.

  • modeling anomalous hysteresis in perovskite Solar Cells
    Journal of Physical Chemistry Letters, 2015
    Co-Authors: Stephan Van Reenen, Martijn Kemerink, Henry J Snaith
    Abstract:

    Organic–inorganic lead halide perovskites are distinct from most other semiconductors because they exhibit characteristics of both electronic and ionic motion. Accurate understanding of the optoelectronic impact of such properties is important to fully optimize devices and be aware of any limitations of perovskite Solar Cells and broader optoelectronic devices. Here we use a numerical drift-diffusion model to describe device operation of perovskite Solar Cells. To achieve hysteresis in the modeled current–voltage characteristics, we must include both ion migration and electronic charge traps, serving as recombination centers. Trapped electronic charges recombine with oppositely charged free electronic carriers, of which the density depends on the bias-dependent ion distribution in the perovskite. Our results therefore show that reduction of either the density of mobile ionic species or carrier trapping at the perovskite interface will remove the adverse hysteresis in perovskite Solar Cells. This gives a c...

  • Stability of metal halide perovskite Solar Cells
    Advanced Energy Materials, 2015
    Co-Authors: Tomas Leijtens, Annamaria Petrozza, Nakita K Noel, Severin N Habisreutinger, Giles E. Eperon, Henry J Snaith
    Abstract:

    In recent years, there has been an unprecedented rise in the performance of metal halide perovskite Solar Cells. They are now in a position to compete on performance with traditional crystalline Solar Cells, and as such the most pressing questions concern the long term operational stability of this class of Solar cell. Here, recent developments in understanding and overcoming stability concerns of metal halide perovskite Solar Cells are highlighted. An overview of possible instability issues due to electrical, atmospheric, heat, and light stresses is provided and the different implications to the most commonly used device architectures are discussed.

  • neutral color semitransparent microstructured perovskite Solar Cells
    ACS Nano, 2014
    Co-Authors: Giles E. Eperon, V M Burlakov, Alain Goriely, Henry J Snaith
    Abstract:

    Neutral-colored semitransparent Solar Cells are commercially desired to integrate Solar Cells into the windows and cladding of buildings and automotive applications. Here, we report the use of morphological control of perovskite thin films to form semitransparent planar heterojunction Solar Cells with neutral color and comparatively high efficiencies. We take advantage of spontaneous dewetting to create microstructured arrays of perovskite “islands”, on a length-scale small enough to appear continuous to the eye yet large enough to enable unattenuated transmission of light between the islands. The islands are thick enough to absorb most visible light, and the combination of completely absorbing and completely transparent regions results in neutral transmission of light. Using these films, we fabricate thin-film Solar Cells with respectable power conversion efficiencies. Remarkably, we find that such discontinuous films still have good rectification behavior and relatively high open-circuit voltages due to...