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

 

G22CMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Cha:2018:10.1002/aenm.201801537,
author = {Cha, H and Tan, C-H and Wu, J and Dong, Y and Zhang, W and Chen, H and Rajaram, S and Narayan, KS and McCulloch, I and Durrant, JR},
doi = {10.1002/aenm.201801537},
journal = {Advanced Energy Materials},
title = {An analysis of the factors determining the efficiency of photocurrent generation in polymer:nonfullerene acceptor solar cells},
url = {http://dx.doi.org/10.1002/aenm.201801537},
volume = {8},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Herein, a metaanalysis 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 PBDTTTEFT and P3HT to 0.36 and ≈1.2 eV, respectively. For blends with PffBT4T and PBDTTTEFT, 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.
AU - Cha,H
AU - Tan,C-H
AU - Wu,J
AU - Dong,Y
AU - Zhang,W
AU - Chen,H
AU - Rajaram,S
AU - Narayan,KS
AU - McCulloch,I
AU - Durrant,JR
DO - 10.1002/aenm.201801537
PY - 2018///
SN - 1614-6832
TI - An analysis of the factors determining the efficiency of photocurrent generation in polymer:nonfullerene acceptor solar cells
T2 - Advanced Energy Materials
UR - http://dx.doi.org/10.1002/aenm.201801537
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000450269900006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - http://hdl.handle.net/10044/1/65082
VL - 8
ER -