Publications
293 results found
Okada Y, Ekins-Daukes NJ, Kita T, et al., 2015, Intermediate band solar cells: Recent progress and future directions, Applied Physics Reviews, Vol: 2, ISSN: 1931-9401
Emmott CJM, Roehr JA, Campoy-Quiles M, et al., 2015, Organic photovoltaic greenhouses: a unique application for semi-transparent PV?, Energy & Environmental Science, Vol: 8, Pages: 1317-1328, ISSN: 1754-5706
Organic photovoltaics are an emerging solar power technology which embody properties such astransparency, flexibility, and rapid, roll to roll manufacture, opening the potential for unique nicheapplications. We report a detailed techno-economic analysis of one such application, namely thephotovoltaic greenhouse, and discuss whether the unique properties of the technology can provideadvantages over conventional photovoltaics. The potential for spectral selectivity through the choice ofOPV materials is evaluated for the case of a photovoltaic greenhouse. The action spectrum of typicalgreenhouse crops is used to determine the impact on crop growth of blocking different spectral rangesfrom the crops. Transfer matrix optical modelling is used to assess the efficiency and spectrally resolvedtransparency of a variety of commercially available semi-conducting polymer materials, in addition to anon-commercial low-band-gap material with absorption outside that required for crop growth. Economicanalysis suggests there could be a huge potential for OPV greenhouses if aggressive cost targets can bemet. Technical analysis shows that semi-transparent OPV devices may struggle to perform better thanopaque crystalline silicon with partial coverage, however, OPV devices using the low-band-gap materialPMDPP3T, as well as a high efficiency mid-band-gap polymer PCDTBT, can demonstrate improvedperformance in comparison to opaque, flexible thin-film modules such as CIGS. These results stress theimportance of developing new, highly transparent electrode and interlayer materials, along with highefficiency active layers, if the full potential of this application is going to be realised.
Toprasertpong K, Fujii H, Thomas T, et al., 2015, Absorption threshold extended to 1.15eV using InGaAs/GaAsP quantum wells for over-50%-efficient lattice-matched quad-junction solar cells, Progress in Photovoltaics, Vol: 24, Pages: 533-542, ISSN: 1099-159X
Mellor A, Hylton NP, Shirley F, et al., 2015, Nanoparticle scattering for radiation-hard multi-junction space solar cells, IEEE 42nd Photovoltaic Specialist Conference (PVSC), Publisher: IEEE, ISSN: 0160-8371
Dimmock JAR, Kauer M, Stavrinou PN, et al., 2015, A metallic hot carrier photovoltaic cell, Conference on Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IV, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
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- Citations: 6
Thomas T, Kasamatsu N, Tan KH, et al., 2015, Time-Resolved Photoluminescence of MBE-Grown 1 eV GaAsSbN for Multi-Junction Solar Cells, IEEE 42nd Photovoltaic Specialist Conference (PVSC), Publisher: IEEE, ISSN: 0160-8371
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- Citations: 1
NELSON J, EKINS-DAUKES NED, 2014, QUANTUM WELL SOLAR CELLS, Series on Photoconversion of Solar Energy, Publisher: IMPERIAL COLLEGE PRESS, Pages: 453-489
Hirst LC, Yakes MK, Bailey CG, et al., 2014, Enhanced Hot-Carrier Effects in InAlAs/InGaAs Quantum Wells, IEEE JOURNAL OF PHOTOVOLTAICS, Vol: 4, Pages: 1526-1531, ISSN: 2156-3381
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- Citations: 38
Chan NLA, Thomas T, Fuehrer M, et al., 2014, Practical Limits of Multijunction Solar Cell Performance Enhancement From Radiative Coupling Considering Realistic Spectral Conditions, IEEE JOURNAL OF PHOTOVOLTAICS, Vol: 4, Pages: 1306-1313, ISSN: 2156-3381
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- Citations: 18
Massa E, Giannini V, Hylton NP, et al., 2014, Diffractive Interference Design Using Front and Rear Surface Metal and Dielectric Nanoparticle Arrays for Photocurrent Enhancement in Thin Crystalline Silicon Solar Cells, ACS PHOTONICS, Vol: 1, Pages: 871-877, ISSN: 2330-4022
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- Citations: 12
Alonso-Alvarez D, Thomas T, Fuehrer M, et al., 2014, InGaAs/GaAsP strain balanced multi-quantum wires grown on misoriented GaAs substrates for high efficiency solar cells, Applied Physics Letters, Vol: 105, ISSN: 1077-3118
Quantum wires (QWRs) form naturally when growing strain balanced InGaAs/GaAsP multi-quantum wells (MQW) on GaAs [100] 6° misoriented substrates under the usual growth conditions. The presence of wires instead of wells could have several unexpected consequences for the performance of the MQW solar cells, both positive and negative, that need to be assessed to achieve high conversion efficiencies. In this letter, we study QWR properties from the point of view of their performance as solar cells by means of transmission electron microscopy, time resolved photoluminescence and external quantum efficiency (EQE) using polarised light. We find that these QWRs have longer lifetimes than nominally identical QWs grown on exact [100] GaAs substrates, of up to 1 μs, at any level of illumination. We attribute this effect to an asymmetric carrier escape from the nanostructures leading to a strong 1D-photo-charging, keeping electrons confined along the wire and holes in the barriers. In principle, these extended lifetimes could be exploited to enhance carrier collection and reduce dark current losses. Light absorption by these QWRs is 1.6 times weaker than QWs, as revealed by EQE measurements, which emphasises the need for more layers of nanostructures or the use light trapping techniques. Contrary to what we expected, QWR show very low absorption anisotropy, only 3.5%, which was the main drawback a priori of this nanostructure. We attribute this to a reduced lateral confinement inside the wires. These results encourage further study and optimization of QWRs for high efficiency solar cells.
Ekins-Daukes NJ, Nelson J, 2014, Quantum Well Solar Cells, Clean Electricity from Photovoltaics, Editors: Green, Archer, Publisher: Imperial College Press, ISBN: 9781848167674
The second edition of Clean Electricity from Photovoltaics, first published in 2001, provides an updated account of the underlying science, technology and market prospects for photovoltaics.
Hirst LC, Walters RJ, Fuehrer MF, et al., 2014, Experimental demonstration of hot-carrier photo-current in an InGaAs quantum well solar cell, APPLIED PHYSICS LETTERS, Vol: 104, ISSN: 0003-6951
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- Citations: 55
Emmott CJM, Ekins-Daukes NJ, Nelson J, 2014, Dynamic carbon mitigation analysis: the role of thin-film photovoltaics, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 7, Pages: 1810-1818, ISSN: 1754-5692
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- Citations: 15
Yoshida M, Amrania H, Farrell DJ, et al., 2014, Progress Toward Realizing an Intermediate Band Solar Cell-Sequential Absorption of Photons in a Quantum Well Solar Cell, IEEE JOURNAL OF PHOTOVOLTAICS, Vol: 4, Pages: 634-638, ISSN: 2156-3381
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- Citations: 11
Ekins-Daukes NJ, 2014, III-V Solar Cells, Solar Cell Materials: Developing Technologies, Editors: Conibeer, Willoughby, Publisher: Wiley, ISBN: 978-0-470-06551-8
Hirst LC, Fujii H, Wang Y, et al., 2014, Hot Carriers in Quantum Wells for Photovoltaic Efficiency Enhancement, IEEE JOURNAL OF PHOTOVOLTAICS, Vol: 4, Pages: 244-252, ISSN: 2156-3381
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- Citations: 76
Ekins-Daukes NJ, 2014, III-V Solar Cells, SOLAR CELL MATERIALS: DEVELOPING TECHNOLOGIES, Editors: Conibeer, Willoughby, Publisher: JOHN WILEY & SONS LTD, Pages: 113-143, ISBN: 978-0-470-06551-8
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- Citations: 9
Hofmann C, Herter B, Gutmann J, et al., 2014, Organic upconverters embedded in a Bragg structure, Conference on Photonics for Solar Energy Systems V, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
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- Citations: 4
Gonzalez M, Lumb MP, Yakes MK, et al., 2014, Modeling, design and experimental results for high efficiency multi-junction solar cells lattice matched to InP, Conference on Physics, Simulation, and Photonic Engineering of Photovoltaic Devices III, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
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- Citations: 3
Alonso-Alvarez D, Fuehrer M, Thomas T, et al., 2014, Elements of modelling and design of multi-quantum well solar cells, 40th IEEE Photovoltaic Specialists Conference (PVSC), Publisher: IEEE, Pages: 2865-2870
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- Citations: 3
Thomas T, Chan NLA, Fuehrer M, et al., 2014, Performance Enhancement from Radiative Coupling Considering Realistic Spectral Conditions for Optimal and Sub-optimal Bandgap Multijunction Solar Cells, 40th IEEE Photovoltaic Specialists Conference (PVSC), Publisher: IEEE, Pages: 3409-3413
Piper RB, Yoshida M, Farrell DJ, et al., 2014, Kinetic insight into bimolecular upconversion: experiment and simulation, RSC ADVANCES, Vol: 4, Pages: 8059-8063
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- Citations: 16
Hylton NP, Li XF, Giannini V, et al., 2013, Loss mitigation in plasmonic solar cells: aluminium nanoparticles for broadband photocurrent enhancements in GaAs photodiodes, SCIENTIFIC REPORTS, Vol: 3, ISSN: 2045-2322
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- Citations: 118
Ekins-Daukes NJ, Lee K-H, Hirst L, et al., 2013, Controlling radiative loss in quantum well solar cells, JOURNAL OF PHYSICS D-APPLIED PHYSICS, Vol: 46, ISSN: 0022-3727
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- Citations: 15
Chan NLA, Brindley HE, Ekins-Daukes NJ, 2013, Impact of individual atmospheric parameters on CPV system power, energy yield and cost of energy, Progress in Photovoltaics, Vol: 22, Pages: 1080-1095, ISSN: 1099-159X
The performance of concentrator photovoltaic systems can be characterised by the power output under reference conditions and the output energy yield under realistic solar illumination. For a range of locations, the frequency distribution of individual atmospheric parameters and their quantitative impact on power output of a concentrator photovoltaic system have been evaluated, with aerosols shown to have a substantial impact on performance at many sites. Limited knowledge of atmospheric parameters results in a difference of up to 75% in simulated energy yield over an annual period and up to 75% deviation in the expected levelised cost of energy.
Tutu FK, Lam P, Wu J, et al., 2013, InAs/GaAs quantum dot solar cell with an AlAs cap layer, APPLIED PHYSICS LETTERS, Vol: 102, ISSN: 0003-6951
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- Citations: 49
Li X, Hylton NP, Giannini V, et al., 2013, Multi-dimensional modeling of solar cells with electromagnetic and carrier transport calculations, PROGRESS IN PHOTOVOLTAICS, Vol: 21, Pages: 109-120, ISSN: 1062-7995
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- Citations: 115
Kowaki H, Lee K-H, Kojima T, et al., 2013, Optical DLTS For The Study Of Recombination Centers In GaAsN Grown By Chemical Beam Epitaxy, 9th International Conference on Concentrator Photovoltaic Systems (CPV), Publisher: AMER INST PHYSICS, Pages: 41-44, ISSN: 0094-243X
Gonzalez M, Lumb MP, Yakes MK, et al., 2013, Towards High Efficiency Multi-Junction Solar Cells Grown on InP Substrates, 39th IEEE Photovoltaic Specialists Conference (PVSC), Publisher: IEEE, Pages: 145-148, ISSN: 0160-8371
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- Citations: 6
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