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{Keivanidis:2018:10.1021/acs.jpcc.8b09825,
author = {Keivanidis, PE and Khan, JI and Katzenmeier, L and Kan, Z and Limbu, S and Constantinou, MK and Lariou, E and Constantinides, G and Hayes, SC and Kim, J-S and Laquai, F},
doi = {10.1021/acs.jpcc.8b09825},
journal = {The Journal of Physical Chemistry C},
pages = {29141--29149},
title = {Impact of structural polymorphs on charge collection and non-geminate recombination in organic photovoltaic devices},
url = {http://dx.doi.org/10.1021/acs.jpcc.8b09825},
volume = {122},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The formation of different types of structural polymorphs of poly(3-hexyl-thiophene) (P3HT) affects the performance of organic photovoltaic (OPV) devices that use thermally-annealed P3HT:PCBM[60] blend films as photoactive layer. Here it is demonstrated that, when densely-packed and non-densely packed P3HT polymorphs co-exist in the P3HT:PCBM[60] layer, non-geminate charge recombination is fast; however, in a device non-geminate recombination is effectively overruled by efficient and fast charge carrier extraction. In stark contrast, when only a less-densely packed P3HT polymorph is present in the blend, non-geminate charge recombination losses are less pronounced, and the charge carrier extraction efficiency is lower. The antagonistic non-geminate charge recombination and charge carrier extraction processes in these systems are monitored by time-delayed-collection field (TDCF) and ultrafast transient absorption (TA) experiments. Furthermore, resonance Raman spectroscopy reveals that in the absence of the densely-packed P3HT polymorph, the energetic disorder present in the P3HT:PCBM[60] blend is higher. High-resolution atomic force microscopy imaging further identifies pronounced differences in the layer morphology when the polymorph distribution varies between unimodal and bimodal. These results indicate that less-densely packed P3HT polymorphs increase disorder and impede charge collection, leading to a reduction of the device fill factor.
AU  - Keivanidis,PE
AU  - Khan,JI
AU  - Katzenmeier,L
AU  - Kan,Z
AU  - Limbu,S
AU  - Constantinou,MK
AU  - Lariou,E
AU  - Constantinides,G
AU  - Hayes,SC
AU  - Kim,J-S
AU  - Laquai,F
DO  - 10.1021/acs.jpcc.8b09825
EP  - 29149
PY  - 2018///
SN  - 1932-7447
SP  - 29141
TI  - Impact of structural polymorphs on charge collection and non-geminate recombination in organic photovoltaic devices
T2  - The Journal of Physical Chemistry C
UR  - http://dx.doi.org/10.1021/acs.jpcc.8b09825
UR  - http://hdl.handle.net/10044/1/65035
VL  - 122
ER  -
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