Journal ArticleDOI
InP Nanowire Array Solar Cells Achieving 13.8% Efficiency by Exceeding the Ray Optics Limit
Jesper Wallentin,Nicklas Anttu,Damir Asoli,Maria Huffman,Ingvar Åberg,Martin Magnusson,Gerald Siefer,Peter Fuss-Kailuweit,Frank Dimroth,Bernd Witzigmann,Hongqi Xu,Hongqi Xu,Lars Samuelson,Knut Deppert,Magnus T. Borgström +14 more
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TLDR
It is reported that arrays of p-i-n InP nanowires (that switch from positive to negative doping), grown to millimeter lengths, can be optimized by varying the nanowire diameter and length of the n-doped segment, which are comparable to the best planar InP photovoltaics.Abstract:
Photovoltaics based on nanowire arrays could reduce cost and materials consumption compared with planar devices but have exhibited low efficiency of light absorption and carrier collection. We fabricated a variety of millimeter-sized arrays of p-type/intrinsic/n-type (p-i-n) doped InP nanowires and found that the nanowire diameter and the length of the top n-segment were critical for cell performance. Efficiencies up to 13.8% (comparable to the record planar InP cell) were achieved by using resonant light trapping in 180-nanometer-diameter nanowires that only covered 12% of the surface. The share of sunlight converted into photocurrent (71%) was six times the limit in a simple ray optics description. Furthermore, the highest open-circuit voltage of 0.906 volt exceeds that of its planar counterpart, despite about 30 times higher surface-to-volume ratio of the nanowire cell.read more
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Journal ArticleDOI
Effective medium theory based analytical models for the potential and field distributions in arrays of nanoscale junctions
TL;DR: In this paper, the potential and field distributions perpendicular to the junction plane in an array correspond to those in a bulk junction with an effective semiconductor medium, whose permittivity and doping are their weighted averages over the cross-sectional areas of the semiconductor and dielectric.
Book ChapterDOI
Surface functionalization of III-V Nanowires
Rainer Timm,Anders Mikkelsen +1 more
TL;DR: In this article, the authors describe how standard surface science techniques such as Scanning Tunneling Microscopy (STM) and X-ray Photoemission Spectroscopy (XPS) can be modified for effective studies of 1D nanowires despite that they have been originally invented only for large and flat 2D surfaces.
Journal ArticleDOI
The effect of V/III ratio on the morphology and structure of GaAs nanowires by MOCVD
TL;DR: In this paper, the growth rate of GaAs nanowires is inversely proportional to their V/III ratio, which is a measure of the amount of atoms pyrolyzed on the surface of the nanowire and substrate.
Journal ArticleDOI
On current technology for light absorber materials used in highly efficient industrial solar cells
TL;DR: In this paper , the state-of-the-art materials processing, research and technology trends, and prospects for various solar light absorber materials such as commercial-grade silicon, gallium arsenide, indium phosphide, cadmium telluride, copper indium gallium diselenide, as well as emerging organic polymers and perovskites, in single-junction and stacked cell configurations for highly efficient industrial solar cells.
References
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Journal ArticleDOI
A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films
TL;DR: In this article, the authors describe a photovoltaic cell, created from low-to medium-purity materials through low-cost processes, which exhibits a commercially realistic energy-conversion efficiency.
Journal ArticleDOI
Porphyrin-Sensitized Solar Cells with Cobalt (II/III)–Based Redox Electrolyte Exceed 12 Percent Efficiency
Aswani Yella,Hsuan-Wei Lee,Hoi Nok Tsao,Chenyi Yi,Aravind Kumar Chandiran,Md. K. Nazeeruddin,Eric Wei-Guang Diau,Chen-Yu Yeh,Shaik M. Zakeeruddin,Michael Grätzel +9 more
TL;DR: In this article, a Co(II/III)tris(bipyridyl)-based redox electrolyte was used in conjunction with a custom synthesized donor-π-bridge-acceptor zinc porphyrin dye as sensitizer (designated YD2-o-C8).
Journal Article
Porphyrin-sensitized solar cells with cobalt (II/III)-based redox electrolyte exceed 12 percent efficiency (vol 334, pg 629, 2011)
TL;DR: Mesoscopic solar cells that incorporate a Co(II/III)tris(bipyridyl)–based redox electrolyte in conjunction with a custom synthesized donor-π-bridge-acceptor zinc porphyrin dye as sensitizer are reported, enabling attainment of strikingly high photovoltages approaching 1 volt.
Journal ArticleDOI
Hybrid Nanorod-Polymer Solar Cells
TL;DR: It is demonstrated that semiconductor nanorods can be used to fabricate readily processed and efficient hybrid solar cells together with polymers and Tuning the band gap by altering the nanorod radius enabled us to optimize the overlap between the absorption spectrum of the cell and the solar emission spectrum.
Journal ArticleDOI
Light Trapping in Silicon Nanowire Solar Cells
Erik C. Garnett,Peidong Yang +1 more
TL;DR: It is demonstrated that ordered arrays of silicon nanowires increase the path length of incident solar radiation by up to a factor of 73, which is above the randomized scattering (Lambertian) limit and is superior to other light-trapping methods.