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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Controlling the polarity of metalorganic vapor phase epitaxy-grown GaP on Si(111) for subsequent III-V nanowire growth
Agnieszka Paszuk,Sebastian Brückner,Sebastian Brückner,Matthias Steidl,W. Zhao,Anja Dobrich,Oliver Supplie,Oliver Supplie,Peter Kleinschmidt,Werner Prost,Thomas Hannappel,Thomas Hannappel +11 more
TL;DR: In this article, the authors obtained vertical GaAs nanowire growth on heteroepitaxial GaP with (1×1) surface reconstruction only, in agreement with growth experiments on homoenitaxially grown GaP(111).
Journal ArticleDOI
Current injection to free-standing III-N nanowires by bipolar diffusion
TL;DR: In this paper, the authors show that with bipolar diffusion injection, injection efficiencies exceeding 80% are feasible even for unoptimized free-standing nanowire structures at current densities up to 100 cm2, with a maximum injection efficiency of approximately 95% at 0.1 cm2.
Journal ArticleDOI
Numerical analysis of InP based high efficiency radial junction nanowire solar cell
TL;DR: In this article, a high performance radial junction III-V nanowire solar cells (NWSC) was proposed, consisting of p-InP NW coated by Ta2O5 and ITO, and simulate it using Lumerical software.
Journal ArticleDOI
Measurement of strain in InGaN/GaN nanowires and nanopyramids
Tomaš Stankevič,Simas Mickevicius,Mikkel Schou Nielsen,O. Kryliouk,Rafal Ciechonski,Giuliano Vescovi,Zhaoxia Bi,Anders Mikkelsen,Lars Samuelson,Carsten Gundlach,Robert Feidenhans'l +10 more
TL;DR: In this paper, X-ray diffraction data are presented that show that InGa1-N shells grown on GaN cores are strained along each of the facets independently, corresponding to different parts of the shell being strained along individual facet planes.
Journal ArticleDOI
Absorption of light in a single vertical nanowire and a nanowire array
TL;DR: Electromagnetic modeling of InP nanowires shows that a single nanowire can show at an absorption peak, a remarkably high absorption cross- section that is more than 50 times the geometrical cross-section, and shows analytically the coupling efficiency of incident light into the fundamental HE11 guided mode and consecutive absorption of the mode in the Nanowires.
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.