Imperial College London
Alternate

ProfessorJi-SeonKim

Faculty of Natural Sciences, Department of Physics

Professor of Solid State Physics
 
 
 
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Contact

 

+44 (0)20 7594 7597ji-seon.kim

 
 
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Location

 

B909Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Luke:2022:10.1002/aenm.202201267,
author = {Luke, J and Yang, EJ and Chin, Y-C and Che, Y and Winkler, L and Whatling, D and Labanti, C and Park, SY and Kim, J-S},
doi = {10.1002/aenm.202201267},
journal = {Advanced Energy Materials},
pages = {1--11},
title = {Strong intermolecular interactions induced by high quadrupole moments enable excellent photostability of non-fullerene acceptors for organic photovoltaics},
url = {http://dx.doi.org/10.1002/aenm.202201267},
volume = {12},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Understanding degradation mechanisms of organic photovoltaics (OPVs) is a critical prerequisite for improving device stability. Herein, the effect of molecular structure on the photostability of non-fullerene acceptors (NFAs) is studied by changing end-group substitution of ITIC derivatives: ITIC, ITIC-2F, and ITIC-DM. Using an assay of in situ spectroscopy techniques and molecular simulations, the photodegradation product of ITIC and the rate of product formation are identified, which correlates excellently to reported device stability, with ITIC-2F being the most stable and ITIC-DM the least. The choice of acceptor is found to affect both the donor polymer (PBDB-T) photostability and the morphological stability of the bulk heterojunction blend. Molecular simulations reveal that NFA end-group substitution strongly modulates the electron distribution within the molecule and thus its quadrupole moment. Compared to unsubstituted-ITIC, end-group fluorination results in a stronger, and demethylation a weaker, molecular quadrupole moment. This influences the intermolecular interactions between NFAs and between the NFA and the polymer, which in turn affects the photostability and morphological stability. This hypothesis is further tested on two other high quadrupole acceptors, Y6 and IEICO-4F, which both show impressive photostability. The strong correlation observed between NFA quadrupole moment and photostability opens a new synthetic direction for photostable organic photovoltaic materials.
AU  - Luke,J
AU  - Yang,EJ
AU  - Chin,Y-C
AU  - Che,Y
AU  - Winkler,L
AU  - Whatling,D
AU  - Labanti,C
AU  - Park,SY
AU  - Kim,J-S
DO  - 10.1002/aenm.202201267
EP  - 11
PY  - 2022///
SN  - 1614-6832
SP  - 1
TI  - Strong intermolecular interactions induced by high quadrupole moments enable excellent photostability of non-fullerene acceptors for organic photovoltaics
T2  - Advanced Energy Materials
UR  - http://dx.doi.org/10.1002/aenm.202201267
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000815607100001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://onlinelibrary.wiley.com/doi/10.1002/aenm.202201267
UR  - http://hdl.handle.net/10044/1/98238
VL  - 12
ER  -
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