Imperial College London

ProfessorJamesDurrant

Faculty of Natural SciencesDepartment of Chemistry

Professor of Photochemistry
 
 
 
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Contact

 

+44 (0)20 7594 5321j.durrant Website

 
 
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Assistant

 

Miss Lisa Benbow +44 (0)20 7594 5883

 
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Location

 

134aChemistrySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

490 results found

Baran D, Gasparini N, Wadsworth A, Tan CH, Wehbe N, Song X, Hamid Z, Zhang W, Neophytou M, Kirchartz T, Brabec CJ, Durrant JR, McCulloch Iet al., 2018, Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination, NATURE COMMUNICATIONS, Vol: 9, ISSN: 2041-1723

JOURNAL ARTICLE

Cha H, Tan CH, 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, ISSN: 1614-6832

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Herein, a meta-analysis of the device performance and transient spectroscopic results are undertaken for various donor:acceptor blends, employing three different donor polymers and seven different acceptors including nonfullerene acceptors (NFAs). From this analysis, it is found that the primary determinant of device external quantum efficiency (EQE) is the energy offset driving interfacial charge separation, ΔECS. For devices employing the donor polymer PffBT4T blended with NFA and fullerene acceptors, an energy offset ΔECS = 0.30 eV is required to achieve near unity charge separation, which increases for blends with PBDTTT-EFT and P3HT to 0.36 and ≈1.2 eV, respectively. For blends with PffBT4T and PBDTTT-EFT, a 100 meV decrease in the LUMO of the acceptor is observed to result in an approximately twofold increase in EQE. Steady state and transient optical data determine that this energy offset requirement is not associated with the need to overcome the polymer exciton binding energy and thereby drive exciton separation, with all blends studied showing efficient exciton separation. Rather, the increase in EQE with larger energy offset is shown to result from suppression of geminate recombination losses. These results are discussed in terms of their implications for the design of donor/NFA interfaces in organic solar cells, and strategies to achieve further advances in device performance.

JOURNAL ARTICLE

Cha H, Wheeler S, Holliday S, Dimitrov SD, Wadsworth A, Lee HH, Baran D, McCulloch I, Durrant JRet al., 2018, Influence of Blend Morphology and Energetics on Charge Separation and Recombination Dynamics in Organic Solar Cells Incorporating a Nonfullerene Acceptor, ADVANCED FUNCTIONAL MATERIALS, Vol: 28, ISSN: 1616-301X

JOURNAL ARTICLE

Christoforidis KC, Syrgiannis Z, La Parola V, Montini T, Petit C, Stathatos E, Godin R, Durrant JR, Prato M, Fornasiero Pet al., 2018, Metal-free dual-phase full organic carbon nanotubes/g-C3N4 heteroarchitectures for photocatalytic hydrogen production, NANO ENERGY, Vol: 50, Pages: 468-478, ISSN: 2211-2855

JOURNAL ARTICLE

Du T, Kim J, Ngiam J, Xu S, Barnes PRF, Durrant JR, McLachlan MAet al., 2018, Elucidating the Origins of Subgap Tail States and Open-Circuit Voltage in Methylammonium Lead Triiodide Perovskite Solar Cells, ADVANCED FUNCTIONAL MATERIALS, Vol: 28, ISSN: 1616-301X

JOURNAL ARTICLE

Durrant J, Simpson A, 2018, Welcome to the second volume of Sustainable Energy & Fuels, SUSTAINABLE ENERGY & FUELS, Vol: 2, Pages: 12-12, ISSN: 2398-4902

JOURNAL ARTICLE

Francàs L, Mesa CA, Pastor E, Le Formal F, Durrant JRet al., 2018, Chapter 5: Rate Law Analysis of Water Splitting Photoelectrodes, RSC Energy and Environment Series, Pages: 128-162

© The Royal Society of Chemistry 2018. In this chapter, we discuss how rate law analyses can shed light into the kinetics and reaction mechanisms of those processes involved in the production of solar fuels. We show that the key data necessary to elucidate rate laws can be easily obtained by combining photo-induced absorbance (PIA) and transient photocurrent (TPC) measurements. The chapter is structured as follows: in the first part, we give a theoretical background (Section 5.1.1) on the use of rate laws and introduce our methodology and experimental approach (Section 5.1.2). In the second part, we show the potential of this technique through several practical examples on state-of-the art systems which cover: oxygen evolution, on α-Fe2O3(Section 5.2.1.1) and BiVO4(Sections 5.2.1.2 and 5.2.1.3) as well as proton reduction on a multi-layer photocathode, Cu2O/AZO/TiO2/RuOx(Section 5.2.2). In addition, the role of the catalyst is also discussed in detail in the last two sections. The kinetic analysis of these systems demonstrates that our methodology is capable of yielding reaction orders and rate constants, both key experimental parameters needed to advance the rational design of photoelectrodes for solar fuels production.

BOOK CHAPTER

Francas L, Burns E, Steier L, Cha H, Sola-Hernandez L, Li X, Tuladhar PS, Bofill R, Garcia-Anton J, Sala X, Durrant JRet al., 2018, Rational design of a neutral pH functional and stable organic photocathode, CHEMICAL COMMUNICATIONS, Vol: 54, Pages: 5732-5735, ISSN: 1359-7345

JOURNAL ARTICLE

Godin R, Hisatomi T, Domen K, Durrant JRet al., 2018, Understanding the visible-light photocatalytic activity of GaN:ZnO solid solution: the role of Rh2-y Cr y O3 cocatalyst and charge carrier lifetimes over tens of seconds., Chem Sci, Vol: 9, Pages: 7546-7555, ISSN: 2041-6520

A persistent challenge for the widespread deployment of solar fuels is the development of high efficiency photocatalysts combined with a low-cost preparation and implementation route. Since its discovery in 2005, GaN:ZnO solid solution has been a benchmark overall water splitting photocatalyst. Notably, GaN:ZnO functionalised with an appropriate proton reduction cocatalyst is one of the few particulate photocatalyst systems that can generate hydrogen and oxygen directly from water using visible light. However, the reasons underlying the remarkable visible light activity of GaN:ZnO are not well understood and photophysical studies of GaN:ZnO have been limited to date. Using time-resolved optical spectroscopies, we investigated the charge carrier dynamics of GaN:ZnO and the effect of Rh2-y Cr y O3 proton reduction cocatalyst. Here we show that charge trapping and trap state filling play an important role in controlling the photophysics of GaN:ZnO. We also find that electrons transfer to Rh2-y Cr y O3 on sub-microsecond timescales, important to reduce the electron concentration within GaN:ZnO and promote hole accumulation. Operando measurements showed that the water oxidation process is the rate determining process, and that the dependence of the rate of water oxidation on the accumulated hole density is similar to common metal oxides photoanodes such as TiO2, α-Fe2O3, and BiVO4. Remarkably, we show that the recombination timescale of holes accumulated on the surface of GaN:ZnO is on the order of 30 s, distinctly longer than for metal oxides photoanodes. We conclude that the unusual visible light activity of GaN:ZnO is a result of large electron-hole spatial separation due to the preferential flow of holes to the GaN-rich surface and efficient electron extraction by the cocatalyst. Our studies demonstrate that in depth spectroscopic investigations of the charge carrier dynamic

JOURNAL ARTICLE

Godin R, Ma X, Gonzalez-Carrero S, Du T, Li X, Lin C-T, McLachlan MA, Galian RE, Perez-Prieto J, Durrant JRet al., 2018, Tuning Charge Carrier Dynamics and Surface Passivation in Organolead Halide Perovskites with Capping Ligands and Metal Oxide Interfaces, ADVANCED OPTICAL MATERIALS, Vol: 6, ISSN: 2195-1071

JOURNAL ARTICLE

Hong DP, Hayasake K, Kim J, Thu TD, Matsui H, Manzhos S, Feron K, Tokito S, Watson T, Tsoi WC, Motta N, Durrant JR, Jain SM, Sonar Pet al., 2018, One step facile synthesis of a novel anthanthrone dye-based, dopant-free hole transporting material for efficient and stable perovskite solar cells, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 6, Pages: 3699-3708, ISSN: 2050-7526

JOURNAL ARTICLE

Hong DP, Thu TD, Kim J, Charbonneau C, Manzhos S, Feron K, Tsoi WC, Durrant JR, Jain SM, Sonar Pet al., 2018, Molecular Engineering Using an Anthanthrone Dye for Low-Cost Hole Transport Materials: A Strategy for Dopant-Free, High-Efficiency, and Stable Perovskite Solar Cells, ADVANCED ENERGY MATERIALS, Vol: 8, ISSN: 1614-6832

JOURNAL ARTICLE

Hong J, Sung MJ, Cha H, Park CE, Durrant JR, An TK, Kim Y-H, Kwon S-Ket al., 2018, Understanding Structure-Property Relationships in All-Small-Molecule Solar Cells Incorporating a Fullerene or Nonfullerene Acceptor., ACS Appl Mater Interfaces, Vol: 10, Pages: 36037-36046

To investigate the influence of donor molecule crystallinity on photovoltaic performance in all-small-molecule solar cells, two dithieno[2,3- d:2',3'- d']-benzo[1,2- b:4,5- b']dithiophene (DTBDT)-based small molecules, denoted as DTBDT-Rho and DTBDT-S-Rho and incorporating different side chains, are synthesized and characterized. The photovoltaic properties of solar cells made of these DTBDT-based donor molecules are systemically studied with the [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) fullerene acceptor and the O-IDTBR nonfullerene acceptor to study the aggregation behavior and crystallinity of the donor molecules in both blends. Morphological analyses and a charge carrier dynamics study are carried out simultaneously to derive structure-property relationships and address the requirements of all-small-molecule solar cells. This study reveals exciton decay loss driven by large-scale phase separation of the DTBDT molecules to be a crucial factor limiting photocurrent generation in the all-small-molecule solar cells incorporating O-IDTBR. In the all-small-molecule blends, DTBDT domains with dimensions greater than 100 nm limit the exciton migration to the donor-acceptor interface, whereas blends with PC71BM exhibit homogeneous phase separation with smaller domains than in the O-IDTBR blends. The significant energy losses in nonfullerene-based devices lead to decreased Jsc and fill factor values and unusual decrease in Voc values. These results indicate the modulation of phase separation to be important for improving the photovoltaic performances of all-small-molecule blends. In addition, the enhanced molecular aggregation of DTBDT-S-Rho with the alkylthio side chain leads to higher degrees of phase separation and unfavorable charge transfer, which are mainly responsible for the relatively low photocurrent when using DTBDT-S-Rho compared with that when using DTBDT-Rho. On the other hand, this enhanced molecular aggregation improves the crystallinity of DTBD

JOURNAL ARTICLE

Jain SM, Phuyal D, Davies ML, Li M, Philippe B, De Castro C, Qiu Z, Kim J, Watson T, Tsoi WC, Karis O, Rensmo H, Boschloo G, Edvinsson T, Durrant JRet al., 2018, An effective approach of vapour assisted morphological tailoring for reducing metal defect sites in lead-free, (CH3NH3)(3)Bi2I9 bismuth-based perovskite solar cells for improved performance and long-term stability, NANO ENERGY, Vol: 49, Pages: 614-624, ISSN: 2211-2855

JOURNAL ARTICLE

Jin MH, Shin E, Jin S, Jo H, Ok KM, Hong J, Jun B-H, Durrant JRet al., 2018, Solvothermal Synthesis of Ferroelectric BaTiO3 Nanoparticles and Their Application to Dye-sensitized Solar Cells, JOURNAL OF THE KOREAN PHYSICAL SOCIETY, Vol: 73, Pages: 627-631, ISSN: 0374-4884

JOURNAL ARTICLE

Kasap H, Godin R, Jeay-Bizot C, Achilleos DS, Fang X, Durrant JR, Reisner Eet al., 2018, Interfacial Engineering of a Carbon Nitride-Graphene Oxide-Molecular Ni Catalyst Hybrid for Enhanced Photocatalytic Activity, ACS CATALYSIS, Vol: 8, Pages: 6914-6926, ISSN: 2155-5435

JOURNAL ARTICLE

Kim J, Godin R, Dimitrov SD, Du T, Bryant D, McLachlan MA, Durrant JRet al., 2018, Excitation Density Dependent Photoluminescence Quenching and Charge Transfer Efficiencies in Hybrid Perovskite/Organic Semiconductor Bilayers, Advanced Energy Materials, ISSN: 1614-6832

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim This study addresses the dependence of charge transfer efficiency between bilayers of methylammonium lead iodide (MAPI3) with PC61BM or poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) charge transfer layers on excitation intensity. It analyzes the kinetic competition between interfacial electron/hole transfer and charge trapping and recombination within MAPI3 by employing a range of optical measurements including steady-state (SS) photoluminescence quenching (PLQ), and transient photoluminescence and absorption over a broad range of excitation densities. The results indicate that PLQ measurements with a typical photoluminescence spectrometer can yield significantly different transfer efficiencies to those measured under 1 Sun irradiation. Steady-state and pulsed measurements indicate low transfer efficiencies at low excitation conditions (<5E + 15 cm−3) due to rapid charge trapping and low transfer efficiencies at high excitation conditions (>5E + 17 cm−3) due to fast bimolecular recombination. Efficient transfer to PC61BM or PEDOT:PSS is only observed under intermediate excitation conditions (≈1 Sun irradiation) where electron and hole transfer times are determined to be 36 and 11 ns, respectively. The results are discussed in terms of their relevance to the excitation density dependence of device photocurrent generation, impact of charge trapping on this dependence, and appropriate methodologies to determine charge transfer efficiencies relevant to device performance.

JOURNAL ARTICLE

Lee HKH, Durrant JR, Li Z, Tsoi WCet al., 2018, Stability study of thermal cycling on organic solar cells, JOURNAL OF MATERIALS RESEARCH, Vol: 33, Pages: 1902-1908, ISSN: 0884-2914

JOURNAL ARTICLE

Lee HKH, Telford AM, Rohr JA, Wyatt MF, Rice B, Wu J, Maciel ADC, Tuladhar SM, Speller E, McGettrick J, Searle JR, Pont S, Watson T, Kirchartz T, Durrant JR, Tsoi WC, Nelson J, Li Zet al., 2018, The role of fullerenes in the environmental stability of polymer: fullerene solar cells, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 11, Pages: 417-428, ISSN: 1754-5692

JOURNAL ARTICLE

Lee HKH, Wu J, Barbe J, Jain SM, Wood S, Speller EM, Li Z, Castro FA, Durrant JR, Tsoi WCet al., 2018, Organic photovoltaic cells - promising indoor light harvesters for self-sustainable electronics, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 6, Pages: 5618-5626, ISSN: 2050-7488

JOURNAL ARTICLE

Lin C-T, Pont S, Kim J, Du T, Xu S, Li X, Bryant D, Mclachlan MA, Durrant JRet al., 2018, Passivation against oxygen and light induced degradation by the PCBM electron transport layer in planar perovskite solar cells, SUSTAINABLE ENERGY & FUELS, Vol: 2, Pages: 1686-1692, ISSN: 2398-4902

JOURNAL ARTICLE

Pont S, Foglia F, Higgins AM, Durrant JR, Cabral JTet al., 2018, Stability of Polymer:PCBM Thin Films under Competitive Illumination and Thermal Stress, ADVANCED FUNCTIONAL MATERIALS, Vol: 28, ISSN: 1616-301X

JOURNAL ARTICLE

Shoaee S, Durrant JR, 2018, Oxygen diffusion dynamics in organic semiconductor films (vol 3, pg 10079, 2015), JOURNAL OF MATERIALS CHEMISTRY C, Vol: 6, Pages: 8553-8554, ISSN: 2050-7526

JOURNAL ARTICLE

Tan C-H, Gorman J, Wadsworth A, Holliday S, Subramaniyan S, Jenekhe SA, Baran D, McCulloch I, Durrant JRet al., 2018, Barbiturate end-capped non-fullerene acceptors for organic solar cells: tuning acceptor energetics to suppress geminate recombination losses, CHEMICAL COMMUNICATIONS, Vol: 54, Pages: 2966-2969, ISSN: 1359-7345

JOURNAL ARTICLE

Zhang J, Tan CH, Du T, Morbidoni M, Lin C-T, Xu S, Durrant JR, McLachlan MAet al., 2018, ZnO-PCBM bilayers as electron transport layers in low-temperature processed perovskite solar cells, SCIENCE BULLETIN, Vol: 63, Pages: 343-348, ISSN: 2095-9273

JOURNAL ARTICLE

Armin A, Durrant JR, Shoaee S, 2017, Interplay Between Triplet-, Singlet-Charge Transfer States and Free Charge Carriers Defining Bimolecular Recombination Rate Constant of Organic Solar Cells, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 121, Pages: 13969-13976, ISSN: 1932-7447

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

Cha H, Wu J, Wadsworth A, Nagitta J, Limbu S, Pont S, Li Z, Searle J, Wyatt MF, Baran D, Kim J-S, McCulloch I, Durrant JRet al., 2017, An Efficient, "Burn in" Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor, ADVANCED MATERIALS, Vol: 29, ISSN: 0935-9648

JOURNAL ARTICLE

Chadwick NP, Kafizas A, Quesada-Cabrera R, Sotelo-Vazquez C, Bawaked SM, Mokhtar M, Al Thabaiti SA, Obaid AY, Basahel SN, Durrant JR, Carmalt CJ, Parkin IPet al., 2017, Ultraviolet Radiation Induced Dopant Loss in a TiO2 Photocatalyst, ACS CATALYSIS, Vol: 7, Pages: 1485-1490, ISSN: 2155-5435

JOURNAL ARTICLE

Collado-Fregoso E, Deledalle F, Utzat H, Tuladhar PS, Dimitrov SD, Gillett A, Tan C-H, Zhang W, McCulloch I, Durrant JRet al., 2017, Photophysical Study of DPPTT-T/PC70BM Blends and Solar Devices as a Function of Fullerene Loading: An Insight into EQE Limitations of DPP-Based Polymers, ADVANCED FUNCTIONAL MATERIALS, Vol: 27, ISSN: 1616-301X

JOURNAL ARTICLE

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