Imperial College London

ProfessorIainMcCulloch

Faculty of Natural SciencesDepartment of Chemistry

Chair in Polymer Materials
 
 
 
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Contact

 

+44 (0)20 7594 5669i.mcculloch

 
 
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Location

 

RCS 1 M229ChemistrySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

395 results found

Wadsworth A, Moser M, Marks A, Little MS, Gasparini N, Brabec CJ, Baran D, McCulloch Iet al., 2019, Critical review of the molecular design progress in non-fullerene electron acceptors towards commercially viable organic solar cells, CHEMICAL SOCIETY REVIEWS, Vol: 48, Pages: 1596-1625, ISSN: 0306-0012

JOURNAL ARTICLE

Dimitrov SD, Azzouzi M, Wu J, Yao J, Dong Y, Tuladhar PS, Schroeder BC, Bittner ER, McCulloch I, Nelson J, Durrant JRet al., 2019, Spectroscopic Investigation of the Effect of Microstructure and Energetic Offset on the Nature of Interfacial Charge Transfer States in Polymer: Fullerene Blends, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 141, Pages: 4634-4643, ISSN: 0002-7863

JOURNAL ARTICLE

Moia D, Giovannitti A, Szumska AA, Maria IP, Rezasoltani E, Sachs M, Schnurr M, Barnes PRF, McCulloch I, Nelson Jet al., Design and evaluation of conjugated polymers with polar side chains as electrode materials for electrochemical energy storage in aqueous electrolytes, Energy & Environmental Science, ISSN: 1754-5692

<p>Solution processable p-type and n-type conjugated polymers with polar side chains enable fast charging in aqueous electrolytes and 1.4 V cell voltage.</p>

JOURNAL ARTICLE

Tan C-H, Wadsworth A, Gasparini N, Wheeler S, Holliday S, Ashraf RS, Dimitrov SD, Baran D, McCulloch I, Durrant JRet al., 2019, Excitation Wavelength-Dependent Internal Quantum Efficiencies in a P3HT/Nonfullerene Acceptor Solar Cell, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 123, Pages: 5826-5832, ISSN: 1932-7447

JOURNAL ARTICLE

Dong Y, Cha H, Zhang J, Pastor E, Tuladhar PS, McCulloch I, Durrant JR, Bakulin AAet al., 2019, The binding energy and dynamics of charge-transfer states in organic photovoltaics with low driving force for charge separation, JOURNAL OF CHEMICAL PHYSICS, Vol: 150, ISSN: 0021-9606

JOURNAL ARTICLE

Thiburce Q, Giovannitti A, McCulloch I, Campbell AJet al., 2019, Nanoscale Ion-Doped Polymer Transistors, NANO LETTERS, Vol: 19, Pages: 1712-1718, ISSN: 1530-6984

JOURNAL ARTICLE

Wang SJ, Venkateshvaran D, Mahani MR, Chopra U, McNellis ER, Di Pietro R, Schott S, Wittmann A, Schweicher G, Cubukcu M, Kang K, Carey R, Wagner TJ, Siebrecht JNM, Wong DPGH, Jacobs IE, Aboljadayel RO, Ionescu A, Egorov SA, Mueller S, Zadvorna O, Skalski P, Jellett C, Little M, Marks A, McCulloch I, Wunderlich J, Sinova J, Sirringhaus Het al., 2019, Long spin diffusion lengths in doped conjugated polymers due to enhanced exchange coupling, Nature Electronics, Vol: 2, Pages: 98-107

© 2019, The Author(s), under exclusive licence to Springer Nature Limited. Carbon-based semiconductors such as conjugated organic polymers are of potential use in the development of spintronic devices and spin-based information processing. In particular, these materials offer a low spin–orbit coupling strength due to their relatively light constituent chemical elements, which should, in principle, favour long spin diffusion lengths. However, organic polymers are relatively disordered materials and typically have a carrier mobility that is orders of magnitude lower than crystalline inorganic materials. As a result, small spin diffusion lengths of around 50 nm have typically been measured using vertical organic spin valves. Here, we report measuring spin diffusion lengths in doped conjugated polymers using a lateral spin transport device architecture, which is based on spin pumping injection and inverse spin Hall detection. The approach suggests that long spin diffusion lengths of more than 1 μm and fast spin transit times of around 10 ns are possible in conjugated polymer systems when they have a sufficiently high spin density (around 10 20 cm −3 ). We explain these results in terms of an exchange-based spin diffusion regime in which the exchange interactions decouple spin and charge transport.

JOURNAL ARTICLE

Luke J, Speller EM, Wadsworth A, Wyatt MF, Dimitrov S, Lee HKH, Li Z, Tsoi WC, McCulloch I, Bagnis D, Durrant JR, Kim J-Set al., 2019, Twist and Degrade-Impact of Molecular Structure on the Photostability of Nonfullerene Acceptors and Their Photovoltaic Blends, Advanced Energy Materials, Pages: 1803755-1803755, ISSN: 1614-6832

JOURNAL ARTICLE

Savva A, Cendra C, Giugni A, Torre B, Surgailis J, Ohayon D, Giovannitti A, McCulloch I, Di Fabrizio E, Salleo A, Rivnay J, Inal Set al., 2019, Influence of Water on the Performance of Organic Electrochemical Transistors, CHEMISTRY OF MATERIALS, Vol: 31, Pages: 927-937, ISSN: 0897-4756

JOURNAL ARTICLE

Kiefer D, Kroon R, Hofmann AI, Sun H, Liu X, Giovannitti A, Stegerer D, Cano A, Hynynen J, Yu L, Zhang Y, Nai D, Harrelson TF, Sommer M, Moule AJ, Kemerink M, Marder SR, McCulloch I, Fahlman M, Fabiano S, Mueller Cet al., 2019, Double doping of conjugated polymers with monomer molecular dopants, NATURE MATERIALS, Vol: 18, Pages: 149-+, ISSN: 1476-1122

JOURNAL ARTICLE

Cendra C, Giovannitti A, Savva A, Venkatraman V, McCulloch I, Salleo A, Inal S, Rivnay Jet al., 2019, Role of the Anion on the Transport and Structure of Organic Mixed Conductors, ADVANCED FUNCTIONAL MATERIALS, Vol: 29, ISSN: 1616-301X

JOURNAL ARTICLE

Gasparini N, Salleo A, McCulloch I, Baran Det al., 2019, The role of the third component in ternary organic solar cells, Nature Reviews Materials

© 2019, Springer Nature Limited. Ternary organic solar cells (TSCs) contain a single three-component photoactive layer with a wide absorption window, which is obtained without the need for multiple stacks. Subsequently, TSCs have attracted great interest in the photovoltaics field. Through careful selection of the three (or more) active components that form the photoactive layer, all photovoltaic parameters can be simultaneously enhanced within a TSC — a strategy that has resulted in record efficiencies for single-junction solar cells. In this Review, we outline key developments in TSCs, with a focus on the central role of the third component in achieving record efficiencies. We analyse the effects of the third component on the nanomorphology of the bulk heterojunction and the photovoltaic parameters of TSCs. Moreover, we discuss the charge-transfer and/or energy-transfer mechanisms and nanomorphology models that govern the operation of TSCs. We consider both polymer and small-molecule donors as well as fullerenes and recently developed non-fullerene acceptors. In addition, we summarize the recent success of TSCs in mitigating the stability issues of binary solar cells. Finally, we provide a perspective on the advantages of ternary blends and suggest design strategies for highly efficient and stable devices for commercial photovoltaics.

JOURNAL ARTICLE

Speller EM, Clarke AJ, Aristidou N, Wyatt MF, Francàs L, Fish G, Cha H, Lee HKH, Luke J, Wadsworth A, Evans AD, McCulloch I, Kim JS, Haque SA, Durrant JR, Dimitrov SD, Tsoi WC, Li Zet al., 2019, Toward Improved Environmental Stability of Polymer:Fullerene and Polymer:Nonfullerene Organic Solar Cells: A Common Energetic Origin of Light- and Oxygen-Induced Degradation, ACS Energy Letters, Pages: 846-852

Copyright © 2019 American Chemical Society. With the emergence of nonfullerene electron acceptors resulting in further breakthroughs in the performance of organic solar cells, there is now an urgent need to understand their degradation mechanisms in order to improve their intrinsic stability through better material design. In this study, we present quantitative evidence for a common root cause of light-induced degradation of polymer:nonfullerene and polymer:fullerene organic solar cells in air, namely, a fast photo-oxidation process of the photoactive materials mediated by the formation of superoxide radical ions, whose yield is found to be strongly controlled by the lowest unoccupied molecular orbital (LUMO) levels of the electron acceptors used. Our results elucidate the general relevance of this degradation mechanism to both polymer:fullerene and polymer:nonfullerene blends and highlight the necessity of designing electron acceptor materials with sufficient electron affinities to overcome this challenge, thereby paving the way toward achieving long-term solar cell stability with minimal device encapsulation.

JOURNAL ARTICLE

Hallani RK, Fallah Hamidabadi V, Huckaba AJ, Galliani G, Babaei A, La-Placa M-G, Bahari A, McCulloch I, Nazeeruddin MK, Sessolo M, Bolink HJet al., 2018, A new cross-linkable 9,10-diphenylanthracene derivative as a wide bandgap host for solution-processed organic light-emitting diodes, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 6, Pages: 12948-12954, ISSN: 2050-7526

JOURNAL ARTICLE

Xie C, Heumueller T, Gruber W, Tang X, Classen A, Schuldes I, Bidwell M, Spaeth A, Fink RH, Unruh T, McCulloch I, Li N, Brabec CJet al., 2018, Overcoming efficiency and stability limits in water-processing nanoparticular organic photovoltaics by minimizing microstructure defects, NATURE COMMUNICATIONS, Vol: 9, ISSN: 2041-1723

JOURNAL ARTICLE

Thorley KJ, McCulloch I, 2018, Why are S-F and S-O non-covalent interactions stabilising?, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 6, Pages: 12413-12421, ISSN: 2050-7526

JOURNAL ARTICLE

Kosco J, Sachs M, Godin R, Kirkus M, Francas L, Bidwell M, Qureshi M, Anjum D, Durrant JR, McCulloch Iet al., 2018, The Effect of Residual Palladium Catalyst Contamination on the Photocatalytic Hydrogen Evolution Activity of Conjugated Polymers, ADVANCED ENERGY MATERIALS, Vol: 8, ISSN: 1614-6832

JOURNAL ARTICLE

Lamport ZA, Barth KJ, Lee H, Gann E, Engmann S, Chen H, Guthold M, McCulloch I, Anthony JE, Richter LJ, DeLongchamp DM, Jurchescu ODet al., 2018, A simple and robust approach to reducing contact resistance in organic transistors, NATURE COMMUNICATIONS, Vol: 9, ISSN: 2041-1723

JOURNAL ARTICLE

Niu T, Lu J, Tang M-C, Barrit D, Smilgies D-M, Yang Z, Li J, Fan Y, Luo T, McCulloch I, Amassian A, Liu SF, Zhao Ket al., 2018, High performance ambient-air-stable FAPbI(3) perovskite solar cells with molecule-passivated Ruddlesden-Popper/3D heterostructured film, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 11, Pages: 3358-3366, ISSN: 1754-5692

JOURNAL ARTICLE

Cha H, Tan C-H, Wu J, Dong Y, Zhang W, Chen H, Rajaram S, Narayan KS, McCulloch I, Durrant JRet al., 2018, An Analysis of the Factors Determining the Efficiency of Photocurrent Generation in Polymer:Nonfullerene Acceptor Solar Cells, ADVANCED ENERGY MATERIALS, Vol: 8, ISSN: 1614-6832

JOURNAL ARTICLE

Chen H-Y, Schweicher G, Planells M, Ryno SM, Broch K, White AJP, Simatos D, Little M, Jellett C, Cryer SJ, Marks A, Hurhangee M, Bredas J-L, Sirringhaus H, McCulloch Iet al., 2018, Crystal Engineering of Dibenzothiophenothieno[3,2-b]thiophene (DBTTT) Isomers for Organic Field-Effect Transistors, CHEMISTRY OF MATERIALS, Vol: 30, Pages: 7587-7592, ISSN: 0897-4756

JOURNAL ARTICLE

Kosco J, McCulloch I, 2018, Residual Pd Enables Photocatalytic H-2 Evolution from Conjugated Polymers, ACS ENERGY LETTERS, Vol: 3, Pages: 2846-2850, ISSN: 2380-8195

JOURNAL ARTICLE

Liao H, Xiao C, Ravva MK, Wang Y, Little M, Jenart MVC, Onwubiko A, Li Z, Wang Z, Bredas J-L, McCulloch I, Yue Wet al., 2018, Synthesis and properties of isoindigo and benzo[1,2-b:4,5-b ']bis[b]benzothiophene oligomers, CHEMICAL COMMUNICATIONS, Vol: 54, Pages: 11152-11155, ISSN: 1359-7345

JOURNAL ARTICLE

Wadsworth A, Hamid Z, Bidwell M, Ashraf RS, Khan JI, Anjum DH, Cendra C, Yan J, Rezasoltani E, Guilbert AAY, Azzouzi M, Gasparini N, Bannock JH, Baran D, Wu H, de Mello JC, Brabec CJ, Salleo A, Nelson J, Laquai F, McCulloch Iet al., 2018, Progress in Poly (3-Hexylthiophene) Organic Solar Cells and the Influence of Its Molecular Weight on Device Performance, ADVANCED ENERGY MATERIALS, Vol: 8, ISSN: 1614-6832

JOURNAL ARTICLE

Nikolka M, Hurhangee M, Sadhanala A, Chen H, McCulloch I, Sirringhaus Het al., 2018, Correlation of Disorder and Charge Transport in a Range of Indacenodithiophene-Based Semiconducting Polymers, ADVANCED ELECTRONIC MATERIALS, Vol: 4, ISSN: 2199-160X

JOURNAL ARTICLE

Du W, Ohayon D, Combe C, Mottier L, Maria IP, Ashraf RS, Fiumelli H, Inal S, McCulloch Iet al., 2018, Improving the Compatibility of Diketopyrrolopyrrole Semiconducting Polymers for Biological Interfacing by Lysine Attachment, CHEMISTRY OF MATERIALS, Vol: 30, Pages: 6164-6172, ISSN: 0897-4756

JOURNAL ARTICLE

Nikolka M, Schweicher G, Armitage J, Nasrallah I, Jellett C, Guo Z, Hurhangee M, Sadhanala A, McCulloch I, Nielsen CB, Sirringhaus Het al., 2018, Performance Improvements in Conjugated Polymer Devices by Removal of Water-Induced Traps, ADVANCED MATERIALS, Vol: 30, ISSN: 0935-9648

JOURNAL ARTICLE

Paterson AF, Singh S, Fallon KJ, Hodsden T, Han Y, Schroeder BC, Bronstein H, Heeney M, McCulloch I, Anthopoulos TDet al., 2018, Recent Progress in High-Mobility Organic Transistors: A Reality Check, ADVANCED MATERIALS, Vol: 30, ISSN: 0935-9648

JOURNAL ARTICLE

Song X, Gasparini N, Nahid MM, Chen H, Macphee SM, Zhang W, Norman V, Zhu C, Bryant D, Ade H, McCulloch I, Baran Det al., 2018, A Highly Crystalline Fused-Ring n-Type Small Molecule for Non-Fullerene Acceptor Based Organic Solar Cells and Field-Effect Transistors, ADVANCED FUNCTIONAL MATERIALS, Vol: 28, ISSN: 1616-301X

JOURNAL ARTICLE

McCulloch I, 2018, Semiconducting polymer for electronic and bioelectronic applications, 256th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nanoscience, Nanotechnology and Beyond, Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

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