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Research Output 2000 2019

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Article
2019
10 Citations (Scopus)

How transport layer properties affect perovskite solar cell performance: Insights from a coupled charge transport/ion migration model

Courtier, N. E., Cave, J. M., Foster, J. M., Walker, A. B. & Richardson, G., 1 Jan 2019, In : Energy and Environmental Science. 12, 1, p. 396-409 14 p.

Research output: Contribution to journalArticle

Open Access
1 Citation (Scopus)
Open Access
1 Citation (Scopus)

Putting the Squeeze on Lead Iodide Perovskites: Pressure-Induced Effects to Tune Their Structural and Optoelectronic Behavior

Ghosh, D., Aziz, A., Dawson, J. A., Walker, A. B. & Islam, M. S., 11 Jun 2019, In : Chemistry of Materials. 31, 11, p. 4063-4071 9 p.

Research output: Contribution to journalArticle

Open Access
5 Downloads (Pure)

Simulating morphologies of organic semiconductors by exploiting low-frequency vibrational modes

Smith, A. R., Thompson, I. R. & Walker, A. B., 28 Apr 2019, In : Journal of Chemical Physics. 150, 16, 164115.

Research output: Contribution to journalArticle

Open Access
File
2018
16 Citations (Scopus)
38 Downloads (Pure)

Lead-Free Perovskite Semiconductors Based on Germanium-Tin Solid Solutions: Structural and Optoelectronic Properties

Nagane, S., Ghosh, D., Hoye, R. L. Z., Zhao, B., Ahmad, S., Walker, A. B., Saiful Islam, M., Ogale, S. & Sadhanala, A., 22 Mar 2018, In : Journal of Physical Chemistry C. 122, 11, p. 5940-5947 8 p.

Research output: Contribution to journalArticle

Open Access
File
Germanium
Tin
Optoelectronic devices
Perovskite
Solid solutions
2 Citations (Scopus)
31 Downloads (Pure)

Microscopic origins of charge transport in triphenylene systems

Thompson, I. R., Coe, M. K., Walker, A. B., Ricci, M., Roscioni, O. M. & Zannoni, C., 5 Jun 2018, In : Physical Review Materials. 2, 6, 12 p., 064601.

Research output: Contribution to journalArticle

Open Access
File
graph theory
organic semiconductors
inhomogeneity
simulation
trajectories
11 Citations (Scopus)
5 Downloads (Pure)
Open Access
File
Electronic properties
Cations
Solar cells
Hydrogen bonds
Positive ions
1 Citation (Scopus)

On the importance of detailed structure in molecular electronics (and why microscopic models cannot see the wood for trees)

Thompson, I. R., Coe, M. K., Walker, A. B., Ricci, M., Roscioni, O. M. & Zannoni, C., 8 Dec 2018, In : Liquid Crystals. 45, 13-15, p. 2086-2096 11 p.

Research output: Contribution to journalArticle

4 Citations (Scopus)
1 Downloads (Pure)

The Role of Surface Recombination on the Performance of Perovskite Solar Cells: Effect of Morphology and Crystalline Phase of TiO2 Contact

Idígoras, J., Contreras-Bernal, L., Cave, J. M., Courtier, N. E., Barranco, Á., Borras, A., Sánchez-Valencia, J. R., Anta, J. A. & Walker, A. B., 9 Nov 2018, In : Advanced Materials Interfaces. 5, 21, 1801076.

Research output: Contribution to journalArticle

Open Access
File
2017
14 Citations (Scopus)
62 Downloads (Pure)

Azetidinium lead iodide for perovskite solar cells

Pering, S. R., Deng, W., Troughton, J. R., Kubiak, P. S., Ghosh, D., Niemann, R. G., Brivio, F., Jeffrey, F. E., Walker, A. B., Islam, M. S., Watson, T. M., Raithby, P. R., Johnson, A. L., Lewis, S. E. & Cameron, P. J., 21 Oct 2017, In : Journal of Materials Chemistry A. 5, 39, p. 20658-20665 8 p.

Research output: Contribution to journalArticle

Open Access
File
Iodides
Positive ions
Cations
Lead
Phase separation
30 Citations (Scopus)
17 Downloads (Pure)

Good Vibrations: Locking of Octahedral Tilting in Mixed-Cation Iodide Perovskites for Solar Cells

Ghosh, D., Walsh Atkins, P., Islam, M. S., Walker, A. B. & Eames, C., 13 Oct 2017, In : ACS Energy Letters. 2, 10, p. 2424-2429 6 p.

Research output: Contribution to journalArticle

Open Access
File
Iodides
Cations
Solar cells
Positive ions
Metal halides
20 Citations (Scopus)
75 Downloads (Pure)

Measurement and modelling of dark current decay transients in perovskite solar cells

O'Kane, S. E. J., Richardson, G., Pockett, A., Niemann, R. G., Cave, J. M., Sakai, N., Eperon, G. E., Snaith, H. J., Foster, J. M., Cameron, P. J. & Walker, A. B., 14 Jan 2017, In : Journal of Materials Chemistry C. 2017, 5, p. 452-462

Research output: Contribution to journalArticle

Open Access
File
Dark currents
Perovskite
Ions
Charge carriers
Activation energy
2016
167 Citations (Scopus)
12 Downloads (Pure)

Can slow-moving ions explain hysteresis in the current–voltage curves of perovskite solar cells?

Richardson, G., O'Kane, S., Niemann, R., Peltola, T., Foster, J., Cameron, P. & Walker, A., 1 Apr 2016, In : Energy & Environmental Science. 9, 4, p. 1476-1485 10 p.

Research output: Contribution to journalArticle

Open Access
perovskite
hysteresis
Hysteresis
Ions
ion
12 Citations (Scopus)
172 Downloads (Pure)

Utilizing energy transfer in binary and ternary bulk heterojunction organic solar cells

Feron, K., Cave, J. M., Thameel, M. N., O'Sullivan, C., Kroon, R., Andersson, M. R., Zhou, X., Fell, C. J., Belcher, W. J., Walker, A. B. & Dastoor, P. C., 17 Aug 2016, In : ACS Applied Materials and Interfaces. 8, 32, p. 20928-20937 10 p.

Research output: Contribution to journalArticle

Open Access
File
Energy transfer
Heterojunctions
Excitons
Naphthyridines
Thiophenes

Why you should get ready to say goodbye to the humble lightbulb

Walker, A., 13 Jun 2016, The Conversation.

Research output: Contribution to specialist publicationArticle

2015
202 Citations (Scopus)
34 Downloads (Pure)
Open Access
2014
38 Citations (Scopus)

Influence of ionizing dopants on charge transport in organic semiconductors

Abate, A., Staff, D. R., Hollman, D. J., Snaith, H. J. & Walker, A. B., 1 Jan 2014, In : Physical Chemistry Chemical Physics . 16, 3, p. 1132-1138 7 p.

Research output: Contribution to journalArticle

Semiconducting organic compounds
organic semiconductors
Charge transfer
Doping (additives)
anions
14 Citations (Scopus)
102 Downloads (Pure)

Understanding the role of ultra-thin polymeric interlayers in improving efficiency of polymer light emitting diodes

Bailey, J., Wright, E. N., Wang, X., Walker, A. B., Bradley, D. D. C. & Kim, J-S., 28 May 2014, In : Journal of Applied Physics. 115, 20, p. 1 - 12 12 p., 204508.

Research output: Contribution to journalArticle

Open Access
File
interlayers
light emitting diodes
polymers
excitons
quenching
2013
345 Citations (Scopus)
99 Downloads (Pure)

Structural and electronic properties of hybrid perovskites for high-efficiency thin-film photovoltaics from first-principles

Brivio, F., Walker, A. B. & Walsh, A., Oct 2013, In : APL Materials. 1, 4, 042111.

Research output: Contribution to journalArticle

Open Access
File
Electronic properties
Cations
Structural properties
Energy gap
Positive ions
2012
16 Citations (Scopus)
93 Downloads (Pure)

In situ detection of free and trapped electrons in dye-sensitized solar cells by photo-induced microwave reflectance measurements

Dunn, H. K., Peter, L. M., Bingham, S. J., Maluta, E. & Walker, A. B., 18 Oct 2012, In : Journal of Physical Chemistry C. 116, 41, p. 22063-22072 10 p.

Research output: Contribution to journalArticle

Open Access
File
Reflectometers
free electrons
solar cells
dyes
Microwaves
51 Citations (Scopus)
98 Downloads (Pure)

Mesoscopic kinetic Monte Carlo modeling of organic photovoltaic device characteristics

Kimber, R. G. E., Wright, E. N., O'Kane, S. E. J., Walker, A. B. & Blakesley, J. C., 26 Dec 2012, In : Physical Review B. 86, 23, 235206.

Research output: Contribution to journalArticle

Open Access
File
Kinetics
kinetics
electric potential
curves
disorders
2011
12 Citations (Scopus)
88 Downloads (Pure)

Determination of the electron diffusion length in dye-sensitized solar cells by substrate contact patterning

Dunn, H. K., Westin, P-O., Staff, D. R., Peter, L. M., Walker, A. B., Boschloo, G. & Hagfeldt, A., 21 Jul 2011, In : Journal of Physical Chemistry C. 115, 28, p. 13932-13937 6 p.

Research output: Contribution to journalArticle

Open Access
File
electron diffusion
diffusion length
strip
solar cells
dyes
25 Citations (Scopus)
140 Downloads (Pure)

Does supramolecular ordering influence exciton transport in conjugated systems? Insight from atomistic simulations

Papadopoulos, T. A., Muccioli, L., Athanasopoulos, S., Walker, A. B., Zannoni, C. & Beljonne, D., Jun 2011, In : Chemical Science. 2, 6, p. 1025-1032 8 p.

Research output: Contribution to journalArticle

Open Access
File
Temperature
Crystalline materials
Liquids
Electronic properties
Optoelectronic devices
19 Citations (Scopus)

Real-time optical waveguide measurements of dye adsorption into nanocrystalline TiO2 films with relevance to dye-sensitized solar cells

Peic, A., Staff, D., Risbridger, T., Menges, B., Peter, L. M., Walker, A. B. & Cameron, P. J., 27 Jan 2011, In : Journal of Physical Chemistry C. 115, 3, p. 613-619 7 p.

Research output: Contribution to journalArticle

Optical waveguides
optical waveguides
Coloring Agents
Dyes
solar cells
2010
59 Citations (Scopus)

Bicontinuous minimal surface nanostructures for polymer blend solar cells

Kimber, R. G. E., Walker, A. B., Schroder-Turk, G. E. & Cleaver, D. J., 28 Jan 2010, In : Physical Chemistry Chemical Physics. 12, 4, p. 844-851 8 p.

Research output: Contribution to journalArticle

minimal surfaces
polymer blends
Polymer blends
Nanostructures
Solar cells
3 Citations (Scopus)

Current-voltage characteristics of dendrimer light-emitting diodes

Stevenson, S. G., Samuel, I. D. W., Staton, S. V., Knights, K. A., Burn, P. L., Williams, J. H. T. & Walker, A. B., 29 Sep 2010, In : Journal of Physics D: Applied Physics. 43, 38, 385106.

Research output: Contribution to journalArticle

Dendrimers
dendrimers
Current voltage characteristics
Light emitting diodes
light emitting diodes
110 Citations (Scopus)

Dynamic Monte Carlo simulation for highly efficient polymer blend photovoltaics

Meng, L. Y., Shang, Y., Li, Q. K., Li, Y. F., Zhan, X. W., Shuai, Z. G., Kimber, R. G. E. & Walker, A. B., 14 Jan 2010, In : Journal of Physical Chemistry B. 114, 1, p. 36-41 6 p.

Research output: Contribution to journalArticle

Polymer blends
Conversion efficiency
Electrodes
Polymers
Energy conversion
4 Citations (Scopus)
72 Downloads (Pure)

Modelling exciton diffusion in disordered conjugated polymers

Athanasopoulos, S., Emelianova, E. V., Walker, A. B. & Beljonne, D., 2010, In : Proceedings of SPIE - The International Society for Optical Engineering. 7722, 772214.

Research output: Contribution to journalArticle

Open Access
File
Conjugated Polymers
Exciton
Conjugated polymers
Excitons
Disorder
43 Citations (Scopus)
solar cells
disorders
evaluation
Carrier mobility
carrier mobility
2009
83 Citations (Scopus)

Exciton diffusion in energetically disordered organic materials

Athanasopoulos, S., Emelianova, E. V., Walker, A. B. & Beljonne, D., Nov 2009, In : Physical Review B. 80, 19, 195209.

Research output: Contribution to journalArticle

organic materials
Excitons
excitons
disorders
Scaling laws
12 Citations (Scopus)
72 Downloads (Pure)

Multiscale Modeling of Charge and Energy Transport in Organic Light-Emitting Diodes and Photovoltaics

Walker, A. B., Sep 2009, In : Proceedings of the IEEE. 97, 9, p. 1587-1596 10 p.

Research output: Contribution to journalArticle

File
Organic light emitting diodes (OLED)
Excitons
Molecules
Polymers
Electronic structure
2008
676 Citations (Scopus)

Dye-sensitized solar cells based on oriented TiO2 nanotube arrays: transport, trapping, and transfer of electrons

Jennings, J. R., Ghicov, A., Peter, L. M., Schmuki, P. & Walker, A. B., 8 Oct 2008, In : Journal of the American Chemical Society. 130, 40, p. 13364-13372 9 p.

Research output: Contribution to journalArticle

Nanotubes
Coloring Agents
Electrons
Titanium
Electron traps
57 Citations (Scopus)

Trap limited exciton transport in conjugated polymers

Athanasopoulos, S., Hennebicq, E., Beljonne, D. & Walker, A., 2008, In : Journal of Physical Chemistry C. 112, 30, p. 11532-11538 7 p.

Research output: Contribution to journalArticle

Conjugated polymers
Excitons
excitons
traps
polymers
42 Citations (Scopus)

Two-dimensional simulations of bulk heterojunction solar cell characteristics

Williams, J. & Walker, A., 2008, In : Nanotechnology. 19, 42, p. 424011 1 p.

Research output: Contribution to journalArticle

Heterojunctions
Gene Conversion
Solar cells
Light interference
Open circuit voltage
2007
71 Citations (Scopus)

Predictive study of charge transport in disordered semiconducting polymers

Athanasopoulos, S., Kirkpatrick, J., Martinez, D., Frost, J. M., Foden, C. M., Walker, A. B. & Nelson, J., 2007, In : Nano Letters. 7, 6, p. 1785-1788 4 p.

Research output: Contribution to journalArticle

Semiconducting polymers
Charge transfer
polymers
charge transfer
disorders
15 Citations (Scopus)

Transient photocurrents in dye-sensitized nanocrystalline solar cells

Walker, A. B., Peter, L. M., Martinez, D. & Lobato, K., 2007, In : Chimia. 61, 12, p. 792-795 4 p.

Research output: Contribution to journalArticle

Photocurrents
Solar cells
Coloring Agents
Lighting
Electrodes
2006
72 Citations (Scopus)

Analysis of photovoltage decay transients in dye-sensitized solar cells

Walker, A. B., Peter, L. M., Lobato, K. & Cameron, P., 2006, In : Journal of Physical Chemistry B. 110, 50, p. 25504-25507 4 p.

Research output: Contribution to journalArticle

Solar cells
Dyes
Electrons
Rate constants
Kinetics
56 Citations (Scopus)

Interpretation of apparent activation energies for electron transport in dye-sensitized nanocrystalline solar cells

Peter, L. M., Walker, A. B., Boschloo, G. & Hagfeldt, A., 2006, In : Journal of Physical Chemistry B. 110, 28, p. 13694-13699 6 p.

Research output: Contribution to journalArticle

Solar cells
Dyes
Activation energy
Electrons
Short circuit currents
2005
320 Citations (Scopus)

Dynamical Monte Carlo modelling of organic solar cells: The dependence of internal quantum efficiency on morphology

Watkins, P. K., Walker, A. B. & Verschoor, G. L. B., 2005, In : Nano Letters. 5, 9, p. 1814-1818 5 p.

Research output: Contribution to journalArticle

30 Citations (Scopus)

Electrical transport characteristics of single-layer organic devices from theory and experiment

Martin, S. J., Walker, A. B., Campbell, A. J. & Bradley, D. D. C., 2005, In : Journal of Applied Physics. 98, 6

Research output: Contribution to journalArticle

86 Citations (Scopus)

Grain morphology and trapping effects on electron transport in dye-sensitized nanocrystalline solar cells

Cass, M. J., Walker, A. B., Martinez, D. & Peter, L. M., 2005, In : Journal of Physical Chemistry B. 109, 11, p. 5100-5107 8 p.

Research output: Contribution to journalArticle

Solar cells
Dyes
Electrons
Photoelectrons
Transient analysis
2004
38 Citations (Scopus)

Degradation in blue-emitting conjugated polymer diodes due to loss of ohmic hole injection

Khan, R. U. A., Bradley, D. D. C., Webster, M. A., Auld, J. L. & Walker, A. B., 2004, In : Applied Physics Letters. 84, 6, p. 921-923 3 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Effect of spatial irregularities on the temperature and field dependence of the mobility in liquid-crystalline conjugated polymer films

Martin, S. J., Kambili, A. & Walker, A. B., 2004, In : Macromolecular Symposia. 212, p. 263-268 6 p.

Research output: Contribution to journalArticle

2003
123 Citations (Scopus)

Influence of grain morphology on electron transport in dye sensitized nanocrystalline solar cells

Cass, M. J., Qiu, F. L., Walker, A. B., Fisher, A. C. & Peter, L. M., 2003, In : Journal of Physical Chemistry B. 107, 1, p. 113-119 7 p.

Research output: Contribution to journalArticle

Solar cells
Dyes
Photocurrents
Electrons
Carrier concentration
17 Citations (Scopus)

Microwave reflectance studies of photoelectrochemical kinetics at semiconductor electrodes. 1. Steady-state, transient, and periodic responses

Cass, M. J., Duffy, N. W., Peter, L. M., Pennock, S. R., Ushiroda, S. & Walker, A. B., 24 May 2003, In : Journal of Physical Chemistry B. 107, 24, p. 5857-5863 7 p.

Research output: Contribution to journalArticle

Microwaves
Semiconductor materials
Electrodes
Kinetics
Rate constants
9 Citations (Scopus)
Microwaves
Semiconductor materials
Hydrogen
Electrodes
Kinetics
19 Citations (Scopus)

Temperature and field dependence of the mobility of highly ordered conjugated polymer films

Martin, S. J., Kambili, A. & Walker, A. B., 2003, In : Physical Review B. 67, 16

Research output: Contribution to journalArticle

2002
6 Citations (Scopus)

Applications of microwave reflectance methods to the study of p-Si in fluoride solutions

Cass, M. J., Duffy, N. W., Kirah, K., Peter, L. M., Pennock, S. R., Ushiroda, S. & Walker, A. B., 13 Dec 2002, In : Journal of Electroanalytical Chemistry. 538-539, p. 191-203 13 p.

Research output: Contribution to journalArticle

Fluorides
Microwaves
Electrons
Silicon
Electric space charge
7 Citations (Scopus)

Effects of piezoelectric field, bias and indium fluctuations on a InGaN-GaN single quantum well system

Oriato, D. & Walker, A. B., 2002, In : Physica B Condensed Matter. 314, 1-4, p. 59-62 4 p.

Research output: Contribution to journalArticle

115 Citations (Scopus)

Electrical transport modelling in organic electroluminescent devices

Walker, A. B., Kambili, A. & Martin, S. J., 2002, In : Journal of Physics-Condensed Matter. 14, 42, p. 9825-9876 52 p.

Research output: Contribution to journalArticle