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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Axial p‐n junction design and characterization for InP nanowire array solar cells
Qian Gao,Ziyuan Li,Li Li,Kaushal Vora,Zhe Li,Ahmed Alabadla,Fan Wang,Yanan Guo,Kun Peng,Yesaya C. Wenas,Sudha Mokkapati,F Fouad Karouta,Hark Hoe Tan,Chennupati Jagadish,Lan Fu +14 more
TL;DR: In this article, the optical properties of different InP nanowire (NW) array solar cells with different axial p−i−n junction designs were investigated, and a glancing angle sputtering deposition technique was developed to enable a direct visualization of the p−n junctions in the vertical array of InP NW solar cells using electron beam-induced current (EBIC) technique.
Journal ArticleDOI
Charge carrier generation, relaxation, and recombination in polytypic GaAs nanowires studied by photoluminescence excitation spectroscopy
TL;DR: In this article, the authors reported results of a study of polytypic GaAs nanowires using low-temperature photoluminescence excitation spectroscopy.
Journal ArticleDOI
Revealing Large-Scale Homogeneity and Trace Impurity Sensitivity of GaAs Nanoscale Membranes
Zhuo Yang,Alessandro Surrente,Gözde Tütüncüoglu,Krzysztof Galkowski,Krzysztof Galkowski,M. Cazaban-Carrazé,Francesca Amaduzzi,P. Leroux,Duncan K. Maude,A. Fontcuberta i Morral,Paulina Plochocka +10 more
TL;DR: The optical properties of molecular beam epitaxy grown GaAs nanomembranes are discussed, highlighting several features that bring them closer to large scale applications and demonstrating the potential of these structures for large scale Applications.
Journal ArticleDOI
Enhanced Near‐Bandgap Response in InP Nanopillar Solar Cells
Corsin Battaglia,Corsin Battaglia,Jingsan Xu,Jingsan Xu,Maxwell Zheng,Maxwell Zheng,Xingtian Yin,Xingtian Yin,Mark Hettick,Mark Hettick,Kevin Chen,Kevin Chen,Nancy M. Haegel,Ali Javey,Ali Javey +14 more
TL;DR: In this article, the authors propose a method to solve the AENM problem by using the Aenm algorithm and show that it works well on a set of algorithms.http://dx.doi.org/10.1002/aenm.201400061
Journal ArticleDOI
Scanning Tunneling Spectroscopy on InAs-GaSb Esaki Diode Nanowire Devices during Operation
TL;DR: This work demonstrates stable scanning tunneling spectroscopy (STS) with nanoscale resolution on electrically active nanowire devices in the common lateral configuration and shows that the STS spectra shift according to the local nanoscales potential drop inside the wire.
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.