Publications
137 results found
Lee K-H, Barnham KWJ, Roberts JS, et al., 2017, Investigation of carrier recombination dynamics of InGaP/InGaAsP multiple quantum wells for solar cells via photoluminescence, IEEE Journal of Photovoltaics, Vol: 7, Pages: 817-821, ISSN: 2156-3381
The carrier recombination dynamics of InGaP/InGaAsP quantum wells is reported for the first time. By studying the photoluminescence (PL) and time-resolved PL decay of InGaP/InGaAsP multiple-quantum-well (MQW) heterostructure samples, it is demonstrated that InGaP/InGaAsP MQWs have very low nonradiative recombination rate and high radiative efficiency compared with the control InGaP sample. Along with the analyses of PL emission spectrum and external quantum efficiencies, it suggests that this is due to small confinement potentials in the conduction band but high confinement potentials in the valence band. These results explain several features found in InGaP/InGaAsP MQW solar cells previously.
Videira JJH, Barnham KWJ, Hankin A, et al., 2015, Introducing novel light management to design a hybrid high concentration photovoltaic/water splitting system, 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC), Publisher: IEEE
We present a novel way to utilize high-concentrationphotovoltaic (HCPV) radiative losses and diffuse light, otherwiseunused in conventional HCPV systems, to power an ImperialCollege designed photoelectrochemical reactor (PECR) producingH2 fuel through water splitting. A high efficiency photovoltaic(HEPV) is embedded inside a Luminescent Solar Concentrator(LSC). Edge emission from the radiative recombination lossmechanism in the HEPV is guided within the LSC to the PECRphotocathode, whilst the LSC emitted light is guided to thephotoanode. The photon streams can be independently optimisedin intensity and wavelength. We demonstrate how photon streamswith balanced intensity can be achieved.
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
Lee K-H, Barnham KWJ, Roberts JS, et al., 2013, Dual-Junction Solar Cells With Multiple-Quantum-Well Top Cells, 9th International Conference on Concentrator Photovoltaic Systems (CPV), Publisher: AMER INST PHYSICS, Pages: 45-47, ISSN: 0094-243X
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- Citations: 2
Lee K-H, Barnham KWJ, Connolly JP, et al., 2012, Demonstration of Photon Coupling in Dual Multiple-Quantum-Well Solar Cells, IEEE JOURNAL OF PHOTOVOLTAICS, Vol: 2, Pages: 68-74, ISSN: 2156-3381
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- Citations: 36
Führer MF, Adams JGJ, Barnham KWJ, et al., 2011, Extensible modelling framework for nanostructured III-V solar cells, Pages: 002615-002618, ISSN: 0160-8371
The use of nanostructures has been shown to provide practical performance enhancements to high-efficiency III-V based solar cells by permitting sub-bandgap tuneable absorption. Nanostructures present a fertile ground for new solar cell technologies, and an improved understanding of fundamental processes may even lead to functional intermediate band and hot-carrier devices. As the fundamental processes occurring in nanostructured solar cells are complex and not easily observable, the study of such devices often requires the analysis of data derived from experimental characterisation techniques using computer models. Models exist for many individual aspects of these nanostructured solar cells, but as yet no comprehensive modelling solution exists. We report on our progress to produce an extendable abstract modelling framework written in the high-level programming language Python. The framework is intended for deployment both as back-end to a variety of interfaces for specialised modelling purposes, and as a library of methods and classes for use at source-code level, allowing adaptation to a wide variety of research problems. Significant code abstraction, such as sequestering complex materials parameterisation behind a simple material object allows simple scripts to do complex work. Modules underway cover several device simulation tiers, including fundamental processes such as quantum well and dot absorption and recombination, as well as device level simulations such as spatial bias mapping using equivalent circuits and multijunction IV characteristics. These simulations correlate with and derive experimental data from characterisation techniques including spatially and temporally resolved electro- and photoluminescence spectroscopy, fourier-transform infrared spectroscopy, and others. © 2011 IEEE.
Danilchenko BA, Budnyk AP, Shpinar LI, et al., 2011, Radiation resistance of GaAs solar cells and hot carriers, SOLAR ENERGY MATERIALS AND SOLAR CELLS, Vol: 95, Pages: 2551-2556, ISSN: 0927-0248
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- Citations: 3
Adams JGJ, Browne BC, Ballard IM, et al., 2011, Recent results for single-junction and tandem quantum well solar cells, Publisher: John Wiley & Sons, Ltd., Pages: 865-877
Connolly JP, Johnson DC, Ballard IM, et al., 2010, Mirrorred strain-balanced quantum well concentrator cells in the radiative limit, Proc. 4th international Conference on Solar Concentrators for the Generation of Electricity or Hydrogen, Pages: 21-24
Thomas N, Bradley J, Knottenbelt W, et al., 2010, Preface, Pages: 1-4, ISSN: 1571-0661
The special issue of Electronic Notes in Theoretical Computer Science contains papers presented at the Fourth International Workshop on the Practical Application of Stochastic Modelling (PASM), held at Imperial College London, in September 2009. The papers in the issue cover a broad range of research in the area of applied stochastic modeling and involve both applications and the theory to enable practical application of modeling techniques. Wolter and Reinecke use a phase-type queuing model to investigate the performance of service-oriented systems. Harrison and Massink investigate the use of stochastic process algebra to analyze a wide range of properties of ubiquitous systems. Ciocchetta and Hillston use the Bio-PEPA process algebra to investigate a class of epidemiological model. Piazolla and Gribaudo exploit recently developed results in mean field analysis to explore the highly novel application area of television and cinema production.
Bessiere A, Connolly JP, Barnham KWJ, et al., 2010, Observation of reduced radiative recombination in low-well-number strain-balanced quantum well solar cells, JOURNAL OF APPLIED PHYSICS, Vol: 107, ISSN: 0021-8979
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- Citations: 3
Barnham KWJ, Ballard IM, Browne BC, et al., 2010, Recent progress in quantum well solar cells, Nanotechnology for Photovoltaics, Pages: 187-210, ISBN: 9781420076745
This chapter reviews recent work by the Quantum Photovoltaic Group (QPV) at Imperial College London and their collaborators in the application of quantum wells (QWs) to photovoltaics (PV). The group has been working on the application of such nanostructures to PV for nearly two decades, but this chapter will focus on work since the last review. The QPV group work on the quantum dot concentrator (QDC) is described elsewhere in this book (Chapter 9).
Bose R, Gonzalez M, Jenkins P, et al., 2010, RESONANCE ENERGY TRANSFER IN LUMINESCENT SOLAR CONCENTRATORS, 35th IEEE Photovoltaic Specialists Conference, Publisher: IEEE, ISSN: 0160-8371
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- Citations: 11
Barnham KWJ, Adams JGJ, Elder W, et al., 2009, Efficiency enhancement in strain-balanced quantum well solar cells via anisotropic emission, 24th European Photovoltaic Solar Energy Conference
Barnham KWJ, Ekins-Daukes NJ, Browne B, 2009, Radiative limits in quantum well solar cells, 24th European Photovoltaic Solar Energy Conference
Chatten AJ, Pravettoni M, Farrell DJ, et al., 2009, External quantum efficiency measurements of luminescent solar concentrators: a study of the impact of backside reflector size and shape, 24th European Photovoltaic Solar Energy Conference
Chatten AJ, Bose R, Farrell DJ, et al., 2009, Luminescent Solar Concentrators: cylindrical design, 24th European Photovoltaic Solar Energy Conference
Grunbaum E, Barkay Z, Shapira Y, et 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
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- Citations: 3
van Sark WGJHM, Barnham KWJ, Slooff LH, et al., 2008, Luminescent Solar Concentrators - A review of recent results, OPTICS EXPRESS, Vol: 16, Pages: 21773-21792, ISSN: 1094-4087
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- Citations: 403
Barnham KWJ, Adams JGJ, Ginige R, et al., 2008, Single-Junction Concentrator Quantum Well Solar Cells Enhanced By Photon Recycling, 23rd European Photovoltaic Solar Energy Conference
Browne B, Ekins-Daukes N, Ioannides A, et al., 2008, Dual Multiple Quantum Well Solar Cells, 23rd European Photovoltaic Solar Energy Conference
Chatten AJ, bose, farrell, et al., 2008, The Effect of Size and Dopant Concentration of the Performance of Nanorod Luminescent Solar Concentrators, The 23rd European Photovoltaic Solar Energy Conference and Exhibition
Barnham KWJ, Fuhrer MF, Connolly JP, et al., 2008, Exciton Broadening in Quantum Well Solar Cells, 23rd European Photovoltaic Solar Energy Conference
Barnham KWJ, Adams JGJ, Connolly JP, et al., 2008, Strain-Balanced Quantum Well Concentrator Cells From Multi-Wafer Production, 33rd IEEE Photovoltaic Specialists Conference
Barnham KWJ, Browne B, Ioannides A, et al., 2008, Tandem Quantum Well Solar Cells, 33rd IEEE Photovoltaic Specialists Conference
Chatten AJ, bose R, farrell D, et al., 2008, The Luminescent Concentrator: Thin Films and Large Area Modelling, PVSAT-4
Barnham KWJ, Browne B, Ioannides A, et al., 2008, Efficiency of Tandem Quantum Well Solar Cells, PVSAT-4
Barnham KWJ, Adams JGJ, Connolly JP, et al., 2008, Characterisation of Strain-Balanced Quantum Well Concentrator Cells Enhanced By Photon Recycling, PVSAT-4
Bose R, Farrell DJ, Chatten AJ, et al., 2008, LUMINESCENT SOLAR CONCENTRATORS: NANORODS AND RAYTRACE MODELING, 33rd IEEE Photovoltaic Specialists Conference, Publisher: IEEE, Pages: 24-+, ISSN: 0160-8371
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- Citations: 5
Pravettoni M, Bose R, Barnham KWJ, et al., 2008, CLASSICAL BEHAVIOUR OF OUTPUT LIGHT EMITTED BY THE EDGE OF A LUMINESCENT SOLAR CONCENTRATOR, 33rd IEEE Photovoltaic Specialists Conference, Publisher: IEEE, Pages: 182-+, ISSN: 0160-8371
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- Citations: 1
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