Polarization Imaging of Emissive Charge Transfer States in Polymer/Fullerene Blends
Camacho Dejay, Rafael LU ; Meyer, Matthias LU ; Vandewal, Koen ; Tang, Zheng ; Inganas, Olle and Scheblykin, Ivan LU
(2014)
In Chemistry of Materials
26(23).
p.6695-6704
- Abstract
- Photoexcitation of conjugated polymerfullerene blends results in population of a local charge transfer (CT) state at the interface between the two materials. The competition between recombination and dissociation of this interfacial state limits the generation of fully separated free charges. Therefore, a detailed understanding of the CT states is critical for building a comprehensive picture of the organic solar cells operation. We applied a new fluorescence microscopy method called two-dimensional polarization imaging to gain insight into the orientation of the transition dipole moments of the CT states, and the associated excitation energy transfer processes in TQ1:PCBM blend films. The polymer phase was oriented mechanically to relate... (More)
- Photoexcitation of conjugated polymerfullerene blends results in population of a local charge transfer (CT) state at the interface between the two materials. The competition between recombination and dissociation of this interfacial state limits the generation of fully separated free charges. Therefore, a detailed understanding of the CT states is critical for building a comprehensive picture of the organic solar cells operation. We applied a new fluorescence microscopy method called two-dimensional polarization imaging to gain insight into the orientation of the transition dipole moments of the CT states, and the associated excitation energy transfer processes in TQ1:PCBM blend films. The polymer phase was oriented mechanically to relate the polymer dipole moment orientation to that of the CT states. CT state formation was observed to be much faster than energy transfer in the polymer phase. However, after being formed an emissive CT state does not exchange excitation energy with other CT states, suggesting that they are spatially and/or energetically isolated. We found that the quantum yield of the CT emission is smaller for CT states spatially located in the highly oriented polymer domains, which is interpreted as the result of enhanced CT state dissociation in highly ordered structures. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4944577
- author
- Camacho Dejay, Rafael
LU
; Meyer, Matthias
LU
; Vandewal, Koen
; Tang, Zheng
; Inganas, Olle
and Scheblykin, Ivan
LU
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Chemistry of Materials
- volume
- 26
- issue
- 23
- pages
- 6695 - 6704
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000346326300005
- scopus:84916623169
- ISSN
- 0897-4756
- DOI
- 10.1021/cm502503f
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
- id
- dd8650f9-4c54-498b-9d9d-3a9b2bd04d5e (old id 4944577)
- date added to LUP
- 2016-04-01 09:51:42
- date last changed
- 2022-04-05 21:43:13
@article{dd8650f9-4c54-498b-9d9d-3a9b2bd04d5e,
abstract = {{Photoexcitation of conjugated polymerfullerene blends results in population of a local charge transfer (CT) state at the interface between the two materials. The competition between recombination and dissociation of this interfacial state limits the generation of fully separated free charges. Therefore, a detailed understanding of the CT states is critical for building a comprehensive picture of the organic solar cells operation. We applied a new fluorescence microscopy method called two-dimensional polarization imaging to gain insight into the orientation of the transition dipole moments of the CT states, and the associated excitation energy transfer processes in TQ1:PCBM blend films. The polymer phase was oriented mechanically to relate the polymer dipole moment orientation to that of the CT states. CT state formation was observed to be much faster than energy transfer in the polymer phase. However, after being formed an emissive CT state does not exchange excitation energy with other CT states, suggesting that they are spatially and/or energetically isolated. We found that the quantum yield of the CT emission is smaller for CT states spatially located in the highly oriented polymer domains, which is interpreted as the result of enhanced CT state dissociation in highly ordered structures.}},
author = {{Camacho Dejay, Rafael and Meyer, Matthias and Vandewal, Koen and Tang, Zheng and Inganas, Olle and Scheblykin, Ivan}},
issn = {{0897-4756}},
language = {{eng}},
number = {{23}},
pages = {{6695--6704}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Chemistry of Materials}},
title = {{Polarization Imaging of Emissive Charge Transfer States in Polymer/Fullerene Blends}},
url = {{http://dx.doi.org/10.1021/cm502503f}},
doi = {{10.1021/cm502503f}},
volume = {{26}},
year = {{2014}},
}