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}
}

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 -