Imperial College London

Dr N.J. (Ned) Ekins-Daukes

Faculty of Natural SciencesDepartment of Physics

Academic Visitor
 
 
 
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Contact

 

+44 (0)20 7594 6675n.ekins-daukes Website

 
 
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Location

 

H1002Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

293 results found

Grunbaum E, Barkay Z, Shapira Y, Barnham KWJ, Bushnell DB, Ekins-Daukes NJ, Mazzer M, Wilshaw Pet al., 2009, Secondary Electron Emission Contrast of Quantum Wells in GaAs p-i-n junctions, MICROSCOPY AND MICROANALYSIS, Vol: 15, Pages: 125-129, ISSN: 1431-9276

Journal article

Auckett JE, Chen YY, Khoury T, Clady RGCR, Ekins-Daukes NJ, Crossley MJ, Schmidt TWet al., 2009, Efficient up-conversion by triplet-triplet annihilation, ISSN: 1742-6588

Following experimental determination of kinetic parameters governing the up-conversion of light by triplet-triplet annihilation (TTA-UC), we develop a kinetic model to determine the conditions required for efficient up-conversion. We discuss the assumptions underpinning statistical arguments for an upper limit to TTA-UC and argue that no such limit exists. © 2009 IOP Publishing Ltd.

Conference paper

Ekins-Daukes NJ, Adams J, Ballard IM, Barnham KWJ, Browne B, Connolly JP, Tibbits T, Hill G, Roberts JSet al., 2009, Physics of Quantum Well Solar Cells, Conference on Physics and Simulation of Optoelectronic Devices XVII, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X

Conference paper

Adams JGJ, Roberts JS, Hill G, Ekins-Daukes NJ, Barnham KWJet al., 2009, DIRECTIONAL EMISSION IN STRAIN-BALANCED QUANTUM WELL SOLAR CELLS, 34th IEEE Photovoltaic Specialists Conference, Publisher: IEEE, Pages: 2120-+, ISSN: 0160-8371

Conference paper

Danilchenko B, Budnyk A, Shpinar L, Poplavskyy D, Zelensky SE, Barnham KWJ, Ekins-Daukes NJet al., 2008, 1 MeV electron irradiation influence on GaAs solar cell performance, SOLAR ENERGY MATERIALS AND SOLAR CELLS, Vol: 92, Pages: 1336-1340, ISSN: 0927-0248

Journal article

Barnham KWJ, Adams JGJ, Ginige R, Connolly JP, Ballard IM, Ekins-Daukes NJ, Hill G, Roberts JSet al., 2008, Single-Junction Concentrator Quantum Well Solar Cells Enhanced By Photon Recycling, 23rd European Photovoltaic Solar Energy Conference

Conference paper

Barnham KWJ, Fuhrer MF, Connolly JP, Mazzer M, Ballard IM, Ekins-Daukes NJ, Johnson DC, Bessiere A, Roberts JS, Airey R, Calder C, Hill G, Tibbits TNDet al., 2008, Exciton Broadening in Quantum Well Solar Cells, 23rd European Photovoltaic Solar Energy Conference

Conference paper

Browne B, Ekins-Daukes N, Ioannides A, Connolly J, Ballard I, Barnham K, Tibbits T, Pate M, Geen M, Roberts J, Hill G, Calder C, Airey R, Smekens G, Van Begin Jet al., 2008, Dual Multiple Quantum Well Solar Cells, 23rd European Photovoltaic Solar Energy Conference

Conference paper

Ekins-Daukes NJ, Schmidt TW, 2008, A molecular approach to the intermediate band solar cell: The symmetric case, APPLIED PHYSICS LETTERS, Vol: 93, ISSN: 0003-6951

Journal article

Ekins-Daukes NJ, 2008, Quantum wells in concentrator solar cells, SPIE Newsroom

Journal article

Yamaguchi M, Sasaki T, Lee H-S, Morioka C, Ekins-Daukes NJ, Imaizumi M, Takamoto T, Ohshima Tet al., 2008, RADIATION-RESISTANCE ANALYSIS OF GaAs AND InGaP SUB CELLS FOR InGaP/GaAs/Ge 3-JUNCTION SPACE SOLAR CELLS, 33rd IEEE Photovoltaic Specialists Conference, Publisher: IEEE, Pages: 1477-+, ISSN: 0160-8371

Conference paper

Ekins-Daukes NJ, 2008, EVALUATION OF InGaP/In<sub>0.01</sub>GaAs/Ge CONCENTRATOR SYSTEM ANNUAL ENERGY YIELD AND COMPARISON TO ESTIMATES BASED ON REFERENCE SPECTRA., 33rd IEEE Photovoltaic Specialists Conference, Publisher: IEEE, Pages: 383-386, ISSN: 0160-8371

Conference paper

Lee H-S, Yamaguchi M, Ekins-Daukes NJ, Khan A, Takamoto T, Imaizumi M, Ohshima T, Itoh Het al., 2007, Radiation resistance of wide band gap <i>n</i>+/<i>p</i> AlInGaP solar cell for high-efficient multijunction space solar cells, JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, Vol: 46, Pages: L645-L647, ISSN: 0021-4922

Journal article

Araki K, Kondo M, Uozumi H, Ekins-Daukes NJ, Egami T, Hiramatsu M, Miyazaki Y, Yamaguchi Met al., 2006, Packaging III-V tandem solar cells for practical terrestrial applications achievable to 27% of module efficiency by conventional machine assemble technology, 14th International Photovoltaic Science and Engineering Conference, Publisher: ELSEVIER SCIENCE BV, Pages: 3320-3326, ISSN: 0927-0248

Conference paper

Araki K, Kondo M, Uozumi H, Ekins-Daukes NJ, Kemmoku Y, Yamaguchi Met al., 2006, Achievement of 27% efficient and 200 Wp concentrator module and the technological roadmap toward realization of more than 31% efficient modules, 14th International Photovoltaic Science and Engineering Conference, Publisher: ELSEVIER SCIENCE BV, Pages: 3312-3319, ISSN: 0927-0248

Conference paper

Sasaki T, Arafune K, Lee HS, Ekins-Daukes NJ, Tanaka S, Ohshita Y, Yamaguchi Met al., 2006, Effects of thermal cycle annealing on reduction of defect density in lattice-mismatched InGaAs solar cells, 23rd International Conference on Defects in Semiconductors, Publisher: ELSEVIER SCIENCE BV, Pages: 626-629, ISSN: 0921-4526

Conference paper

Lee HS, Yamaguchi M, Ekins-Daukes NJ, Khan A, Takamoto T, Imaizumi M, Ohshima T, Itoh Het al., 2006, Effects of a low-energy proton irradiation on n<SUP>+</SUP>/p-AlInGaP solar cells, 23rd International Conference on Defects in Semiconductors, Publisher: ELSEVIER SCIENCE BV, Pages: 564-567, ISSN: 0921-4526

Conference paper

Khan A, Yamaguchi M, Lee HS, Ekins-Daukes NJ, Takamoto T, Imaizumi M, Taylor Set al., 2006, DLTS: A promising technique for the identification of the recombination and compensator centers in solar cell materials, Pages: 1763-1768

Deep level transient spectroscopy (DLTS) is the best technique for monitoring and characterizing deep levels introduced intentionally or occurring naturally in semiconductor materials and complete devices. DLTS has the advantage over all the techniques used to-date in that it fulfils almost all the requirements for a complete characterization of a deep centre and their correlation with the device properties. In particular the method can determine the activation energy of a deep level, its capture cross-section and concentration and can distinguish between traps and recombination centers. In this invited paper we provide an overview of the extensive R&D work that has been carrier out by the authors on the identification of the recombination and compensator centers in Si and III-V compound materials for space solar cells. In addition, we present an overview of key problems that remain in the understanding of the role of the point defects and their correlation with the solar cell parameters. © 2006 IEEE.

Conference paper

Ekins-Daukes NJ, Guenette M, 2006, Photovoltaic device operation at low temperature, 4th World Conference on Photovoltaic Energy Conversion, Publisher: IEEE, Pages: 146-149, ISSN: 2159-2330

Conference paper

Lee H-S, Yamaguchi M, Ekins-Daukes NJ, Khan A, Takamoto T, Imaizumi M, Ohshima T, Itoh Het al., 2006, Minority-carrier injection-enhanced recovery of radiationinduced defects in <i>n</i><SUP>+</SUP><i>p</i> alingap solar cells, 4th World Conference on Photovoltaic Energy Conversion, Publisher: IEEE, Pages: 1826-+, ISSN: 2159-2330

Conference paper

Barnham, K W J, Ballard I, Bessiere A, Chatten A J, Connolly J P, Ekins-Daukes N J, Johnson D C, Lynch M C, Mazzer M, Tibbits, T N D, Hill G, Roberts J S, Malik M Aet al., 2006, Quantum well solar cells and quantum dot concentrators, Nanostructured Materials for Solar Energy Conversion, Pages: 517-538, ISBN: 9780444528445

Book chapter

Sasaki T, Arafunel K, Lee HS, Ekins-Daukes NJ, Tanaka S, Metzger W, Romee MJ, Jonee K, Al-Jassim M, Ohshita Y, Yamaguchi Met al., 2006, Electrical properties and structural defects in lattice mismatched InGaAs solar cells, 4th World Conference on Photovoltaic Energy Conversion, Publisher: IEEE, Pages: 795-798, ISSN: 2159-2330

Conference paper

Khan A, Yamaguchi M, Lee H-S, Ekins-Daukes NJ, Takamoto T, Imaizumi M, Taylor Set al., 2006, DLTS: A promising technique for the identification of the recombination and compensator centers in solar cell materials, 4th World Conference on Photovoltaic Energy Conversion, Publisher: IEEE, Pages: 1763-+, ISSN: 2159-2330

Conference paper

Yamaguchi M, Ekins-Daukes NJ, Lee H-S, Sumita T, Imaizumi M, Takamoto T, Agui T, Kaneiwa M, Kamimura K, Ohshima T, Itoh Het al., 2006, Analysis for radiation-resistance of InGaP and GaAs sub-cells for InGaP/GaAs/Ge 3-junction solar cells, 4th World Conference on Photovoltaic Energy Conversion, Publisher: IEEE, Pages: 1789-+, ISSN: 2159-2330

Conference paper

Lee HS, Yamaguchi M, Ekins-Daukes NJ, Khan A, Takamoto T, Agui T, Kamimura K, Kaneiwa M, Imaizumi M, Ohshima T, Itoh Het al., 2005, Deep-level defects introduced by 1 MeV electron radiation in AlInGaP for multijunction space solar cells, JOURNAL OF APPLIED PHYSICS, Vol: 98, ISSN: 0021-8979

Journal article

Adachi M, Khan A, Ando K, Ekins-Daukes NJ, Lee HS, Yamaguchi Met al., 2005, Electrical and optical properties of radiation-induced dominant recombination center in In<i><sub>x</sub></i>Ga<sub>1-<i>x</i></sub>P space solar cells -: art. no. 155320, PHYSICAL REVIEW B, Vol: 72, ISSN: 1098-0121

Journal article

Araki K, Uozumi H, Egami T, Hiramatsu M, Miyazaki Y, Kemmoku Y, Akisawa A, Ekins-Daukes NJ, Lee HS, Yamaguchi Met al., 2005, Development of concentrator modules with dome-shaped fresnel lenses and triple-junction concentrator cells, PROGRESS IN PHOTOVOLTAICS, Vol: 13, Pages: 513-527, ISSN: 1062-7995

Journal article

Bushnell DB, Tibbits TND, Barnham KWJ, Connolly JP, Mazzer M, Ekins-Daukes NJ, Roberts JS, Hill G, Airey Ret al., 2005, Effect of well number on the performance of quantum-well solar cells, JOURNAL OF APPLIED PHYSICS, Vol: 97, ISSN: 0021-8979

Journal article

Johnson DC, Ballard I, Barnham KWJ, Bishnell DB, Connolly JP, Lynch MC, Tibbits TND, Ekins-Daukes NJ, Mazzer M, Airey Ret al., 2005, Advances in Bragg stack quantum well solar cells, Solar Energy Materials and Solar Cells, Vol: 87, Pages: 169-179, ISSN: 0927-0248

Journal article

Lynch MC, Ballard IM, Bushnell DB, Connolly JP, Johnson DC, Tibbits TND, Barnham KWJ, Ekins-Daukes NJ, Roberts JS, Hill G, Airey R, Mazzer Met al., 2005, Spectral response and I-V characteristics of large well number multi quantum well solar cells, International Conference on Physics, Chemistry and Engineering of Solar Cells, Publisher: SPRINGER, Pages: 1445-1449, ISSN: 0022-2461

Conference paper

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