Imperial College London

Professor Jenny Nelson

Faculty of Natural SciencesDepartment of Physics

Professor of Physics
 
 
 
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Contact

 

+44 (0)20 7594 7581jenny.nelson

 
 
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Location

 

H/1007Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

346 results found

Fei Z, Eisner FD, Jiao X, Azzouzi M, Röhr JA, Han Y, Shahid M, Chesman ASR, Easton CD, McNeill CR, Anthopoulos TD, Nelson J, Heeney Met al., 2018, An Alkylated Indacenodithieno[3,2-b]thiophene-Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses., Adv Mater, Vol: 30

A new synthetic route, to prepare an alkylated indacenodithieno[3,2-b]thiophene-based nonfullerene acceptor (C8-ITIC), is reported. Compared to the reported ITIC with phenylalkyl side chains, the new acceptor C8-ITIC exhibits a reduction in the optical band gap, higher absorptivity, and an increased propensity to crystallize. Accordingly, blends with the donor polymer PBDB-T exhibit a power conversion efficiency (PCE) up to 12.4%. Further improvements in efficiency are found upon backbone fluorination of the donor polymer to afford the novel material PFBDB-T. The resulting blend with C8-ITIC shows an impressive PCE up to 13.2% as a result of the higher open-circuit voltage. Electroluminescence studies demonstrate that backbone fluorination reduces the energy loss of the blends, with PFBDB-T/C8-ITIC-based cells exhibiting a small energy loss of 0.6 eV combined with a high JSCof 19.6 mA cm-2.

JOURNAL ARTICLE

Few SPM, Schmidt O, Offer GJ, Brandon N, Nelson J, Gambhir Aet al., 2018, Prospective improvements in cost and cycle life of off-grid lithium-ion battery packs: An analysis informed by expert elicitations, Energy Policy, Vol: 114, Pages: 578-590, ISSN: 0301-4215

This paper presents probabilistic estimates of the 2020 and 2030 cost and cycle life of lithium-ion battery (LiB) packs for off-grid stationary electricity storage made by leading battery experts from academia and industry, and insights on the role of public research and development (R&D) funding and other drivers in determining these. By 2020, experts expect developments to arise chiefly through engineering, manufacturing and incremental chemistry changes, and expect additional R&D funding to have little impact on cost. By 2030, experts indicate that more fundamental chemistry changes are possible, particularly under higher R&D funding scenarios, but are not inevitable. Experts suggest that significant improvements in cycle life (eg. doubling or greater) are more achievable than in cost, particularly by 2020, and that R&D could play a greater role in driving these. Experts expressed some concern, but had relatively little knowledge, of the environmental impact of LiBs. Analysis is conducted of the implications of prospective LiB improvements for the competitiveness of solar photovoltaic + LiB systems for off-grid electrification.

JOURNAL ARTICLE

Rice B, LeBlanc LM, Otero-de-la-Roza A, Fuchter MJ, Johnson ER, Nelson J, Jelfs KEet al., 2018, A computational exploration of the crystal energy and charge-carrier mobility landscapes of the chiral [6] helicene molecule, NANOSCALE, Vol: 10, Pages: 1865-1876, ISSN: 2040-3364

JOURNAL ARTICLE

Rohr JA, Moia D, Haque SA, Kirchartz T, Nelson Jet al., 2018, Exploring the validity and limitations of the Mott-Gurney law for charge-carrier mobility determination of semiconducting thin-films., J Phys Condens Matter

Using drift-diffusion simulations, we investigate the voltage dependence of the dark current in single carrier devices, typically used to determine charge-carrier mobilities. For both low and high voltages, the current increases linearly with the applied voltage. Whereas the linear current at low voltages is mainly due to space charge in the middle of the device, the linear current at high voltage is caused by charge-carrier saturation due to a high degree of injection. As a consequence, the current density at these voltages does not follow the classical square law derived by Mott and Gurney, and we show that for trap-free devices, only for intermediate voltages, a space-charge-limited drift current can be observed with a slope that approaches two. We show that, depending on the thickness of the semiconductor layer and the size of the injection barriers, the two linear current-voltage regimes can dominate the whole voltage range, and the intermediate Mott-Gurney regime can shrink or disappear. In this case, which will especially occur for thicknesses and injection barriers typical for single-carrier devices used to probe organic semiconductors, a meaningful analysis using the Mott-Gurney law will become unachievable, because a square-law fit can no longer be achieved, resulting in the mobility being substantially underestimated. General criteria for when to expect deviations from the Mott-Gurney law when used for analysis of intrinsic semiconductors are discussed.

JOURNAL ARTICLE

Baran D, Ashraf RS, Hanifi DA, Abdelsamie M, Gasparini N, Rohr JA, Holliday S, Wadsworth A, Lockett S, Neophytou M, Emmott CJM, Nelson J, Brabec CJ, Amassian A, Salleo A, Kirchartz T, Durrant JR, McCulloch Iet al., 2017, Reducing the effciency-stability-cost gap of organic photovoltaics with highly effcient and stable small molecule acceptor ternary solar cells, NATURE MATERIALS, Vol: 16, Pages: 363-+, ISSN: 1476-1122

JOURNAL ARTICLE

Baran D, Tuladhar S, Economopoulos SP, Neophytou M, Savva A, Itskos G, Othonos A, Bradley DDC, Brabec CJ, Nelson J, Choulis SAet al., 2017, Photovoltaic limitations of BODIPY:fullerene based bulk heterojunction solar cells, SYNTHETIC METALS, Vol: 226, Pages: 25-30, ISSN: 0379-6779

JOURNAL ARTICLE

Ben Dkhil S, Gaceur M, Dachraoui W, Hannani D, Fall S, Brunel F, Wang M, Poize G, Mawyin J, Shupyk I, Martini C, Shilova E, Fages F, Ishwara T, Nelson J, Watanabe T, Yoshimoto N, Margeat O, Videlot-Ackermann C, Ackermann Jet al., 2017, P-type semiconductor surfactant modified zinc oxide nanorods for hybrid bulk heterojunction solar cells, SOLAR ENERGY MATERIALS AND SOLAR CELLS, Vol: 159, Pages: 608-616, ISSN: 0927-0248

JOURNAL ARTICLE

Few S, Chia C, Teo D, Kirkpatrick J, Nelson Jet al., 2017, The impact of chemical structure and molecular packing on the electronic polarisation of fullerene arrays, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 19, Pages: 18709-18720, ISSN: 1463-9076

JOURNAL ARTICLE

Guilbert AAY, Zbiri M, Dunbar ADF, Nelson Jet al., 2017, Quantitative Analysis of the Molecular Dynamics of P3HT:PCBM Bulk Heterojunction, JOURNAL OF PHYSICAL CHEMISTRY B, Vol: 121, Pages: 9073-9080, ISSN: 1520-6106

JOURNAL ARTICLE

Hermerschmidt F, Savva A, Georgiou E, Tuladhar SM, Durrant JR, McCulloch I, Bradley DDC, Brabec CJ, Nelson J, Choulis SAet al., 2017, Influence of the Hole Transporting Layer on the Thermal Stability of Inverted Organic Photovoltaics Using Accelerated-Heat Lifetime Protocols, ACS APPLIED MATERIALS & INTERFACES, Vol: 9, Pages: 14136-14144, ISSN: 1944-8244

JOURNAL ARTICLE

Kumar N, Zoladek-Lemanczyk A, Guilbert AAY, Su W, Tuladhar SM, Kirchartz T, Schroeder BC, McCulloch I, Nelson J, Roy D, Castro FAet al., 2017, Simultaneous topographical, electrical and optical microscopy of optoelectronic devices at the nanoscale, NANOSCALE, Vol: 9, Pages: 2723-2731, ISSN: 2040-3364

JOURNAL ARTICLE

Loheeswaran S, Thanihaichelvan M, Ravirajan P, Nelson Jet al., 2017, Controlling recombination kinetics of hybrid poly-3-hexylthiophene (P3HT)/titanium dioxide solar cells by self-assembled monolayers, JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, Vol: 28, Pages: 4732-4737, ISSN: 0957-4522

JOURNAL ARTICLE

Miller TS, Suter TM, Telford AM, Picco L, Payton OD, Russell-Pavier F, Cullen PL, Sella A, Shaffer MSP, Nelson J, Tileli V, McMillan PF, Howard CAet al., 2017, Single Crystal, Luminescent Carbon Nitride Nanosheets Formed by Spontaneous Dissolution, NANO LETTERS, Vol: 17, Pages: 5891-5896, ISSN: 1530-6984

JOURNAL ARTICLE

Nelson J, 2017, A map to find winners, NATURE MATERIALS, Vol: 16, Pages: 969-970, ISSN: 1476-1122

JOURNAL ARTICLE

Prashanthan K, Thivakarasarma T, Ravirajan P, Planells M, Robertson N, Nelson Jet al., 2017, Enhancement of hole mobility in hybrid titanium dioxide/poly(3-hexylthiophene) nanocomposites by employing an oligothiophene dye as an interface modifier, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 5, Pages: 11758-11762, ISSN: 2050-7526

JOURNAL ARTICLE

Rodriguez-Martinez X, Vezie MS, Shi X, McCulloch I, Nelson J, Goni AR, Campoy-Quiles Met al., 2017, Quantifying local thickness and composition in thin films of organic photovoltaic blends by Raman scattering, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 5, Pages: 7270-7282, ISSN: 2050-7526

JOURNAL ARTICLE

Rohr JA, Kirchartz T, Nelson J, 2017, On the correct interpretation of the low voltage regime in intrinsic single-carrier devices, JOURNAL OF PHYSICS-CONDENSED MATTER, Vol: 29, ISSN: 0953-8984

JOURNAL ARTICLE

Sandwell P, Ekins-Daukes N, Nelson J, 2017, What are the greatest opportunities for PV to contribute to rural development?, Pages: 139-146, ISSN: 1876-6102

© 2017 The Authors. Published by Elsevier Ltd. Minigrid systems powered by solar photovoltaics and battery storage are being deployed around the world to provide basic energy access and facilitate economic development. We use a minigrid simulation and optimisation tool that we have developed to assess various minigrid options in meeting the growing electricity demand of a community in rural Uttar Pradesh, India, in terms of the reliability of the service they provide, the cost of electricity, and total greenhouse gas emissions. We assess the breakeven distance at which off-grid minigrids are favourable in comparison to extending an unreliable grid network with a minigrid backup system, both with and without a carbon price. We suggest that policy recommendations that would encourage the use of minigrids for sustainable rural development, for example allowing subsidies to be available for system expansions and minimum service reliability requirements.

CONFERENCE PAPER

Schmidt O, Gambhir A, Staffell I, Hawkes A, Nelson J, Few Set al., 2017, Future cost and performance of water electrolysis: An expert elicitation study, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, Vol: 42, Pages: 30470-30492, ISSN: 0360-3199

JOURNAL ARTICLE

Speller EM, McGettrick JD, Rice B, Telford AM, Lee HKH, Tan C-H, De Castro CS, Davies ML, Watson TM, Nelson J, Durrant JR, Li Z, Tsoi WCet al., 2017, Impact of Aggregation on the Photochemistry of Fullerene Films: Correlating Stability to Triplet Exciton Kinetics, ACS APPLIED MATERIALS & INTERFACES, Vol: 9, Pages: 22739-22747, ISSN: 1944-8244

JOURNAL ARTICLE

Steiner F, Poelking C, Niedzialek D, Andrienko D, Nelson Jet al., 2017, Influence of orientation mismatch on charge transport across grain boundaries in tri-isopropylsilylethynyl (TIPS) pentacene thin films, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 19, Pages: 10854-10862, ISSN: 1463-9076

JOURNAL ARTICLE

Wheeler S, Bryant D, Troughton J, Kirchartz T, Watson T, Nelson J, Durrant JRet al., 2017, Transient Optoelectronic Analysis of the Impact of Material Energetics and Recombination Kinetics on the Open-Circuit Voltage of Hybrid Perovskite Solar Cells, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 121, Pages: 13496-13506, ISSN: 1932-7447

JOURNAL ARTICLE

Yang Y, Rice B, Shi X, Brandt JR, da Costa RC, Hedley GJ, Smilgies D-M, Frost JM, Samuel IDW, Otero-de-la-Roza A, Johnson ER, Jelfs KE, Nelson J, Campbell AJ, Fuchter MJet al., 2017, Emergent Properties of an Organic Semiconductor Driven by its Molecular Chirality, ACS NANO, Vol: 11, Pages: 8329-8338, ISSN: 1936-0851

JOURNAL ARTICLE

Calado P, Telford AM, Bryant D, Li X, Nelson J, O'Regan BC, Barnes PRFet al., 2016, Evidence for ion migration in hybrid perovskite solar cells with minimal hysteresis, NATURE COMMUNICATIONS, Vol: 7, ISSN: 2041-1723

JOURNAL ARTICLE

Ekins-Daukes NJ, Sandwell P, Nelson J, Johnson AD, Duggan G, Herniak Eet al., 2016, What does CPV Need to Achieve in Order to Succeed?, 12th International Conference on Concentrator Photovoltaic Systems (CPV), Publisher: AMER INST PHYSICS, ISSN: 0094-243X

CONFERENCE PAPER

Emmott CJM, Moia D, Sandwell P, Ekins-Daukes N, Hosel M, Lukoschek L, Amarasinghe C, Krebs FC, Nelson Jet al., 2016, In-situ, long-term operational stability of organic photovoltaics for off-grid applications in Africa, SOLAR ENERGY MATERIALS AND SOLAR CELLS, Vol: 149, Pages: 284-293, ISSN: 0927-0248

JOURNAL ARTICLE

Fallon KJ, Wijeyasinghe N, Manley EF, Dimitrov SD, Yousaf SA, Ashraf RS, Duffy W, Guilbert AAY, Freeman DME, Al-Hashimi M, Nelson J, Durrant JR, Chen LX, McCulloch I, Marks TJ, Clarke TM, Anthopoulos TD, Bronstein Het al., 2016, Indolo-naphthyridine-6,13-dione Thiophene Building Block for Conjugated Polymer Electronics: Molecular Origin of Ultrahigh n-Type Mobility, CHEMISTRY OF MATERIALS, Vol: 28, Pages: 8366-8378, ISSN: 0897-4756

JOURNAL ARTICLE

Gambhir A, Sandwell P, Nelson J, 2016, The future costs of OPV A bottom-up model of material and manufacturing costs with uncertainty analysis, SOLAR ENERGY MATERIALS AND SOLAR CELLS, Vol: 156, Pages: 49-58, ISSN: 0927-0248

JOURNAL ARTICLE

Guilbert AAY, Zbiri M, Jenart MVC, Nielsen CB, Nelson Jet al., 2016, New Insights into the Molecular Dynamics of P3HT:PCBM Bulk Heterojunction: A Time-of-Flight Quasi-Elastic Neutron Scattering Study, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, Vol: 7, Pages: 2252-2257, ISSN: 1948-7185

JOURNAL ARTICLE

Hayes SC, Pieridou G, Vezie M, Few S, Bronstein H, Meager I, McCulloch I, Nelson Jet al., 2016, Effect of molecular weight on the vibronic structure of a diketopyrrolopyrrole polymer, Conference on Physical Chemistry of Interfaces and Nanomaterials XV, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X

CONFERENCE PAPER

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