Interchain effects in the ultrafast photophysics of a semiconducting polymer: THz time-domain spectroscopy of thin films and isolated chains in solution
(2005) In Physical Review B (Condensed Matter and Materials Physics) 71(12). p.1-125201- Abstract
- We compare the generation and decay dynamics of charges and excitons in a model polymer semiconductor (MEH-PPV) in solution and drop-cast thin films, by recording the sub-ps transient complex conductivity using THz time-domain spectroscopy. The results show that the quantum efficiency of charge generation is two orders of magnitude smaller in solution (~10–5) than in the solid film (~10–3). The proximity of neighboring chains in the films apparently facilitates (hot) exciton dissociation, presumably by allowing the electron and hole to separate on different polymer strands. For both samples, photoexcitation leads to the predominant formation of bound charge pairs (excitons) that can be detected through their polarizability. Surprisingly,... (More)
- We compare the generation and decay dynamics of charges and excitons in a model polymer semiconductor (MEH-PPV) in solution and drop-cast thin films, by recording the sub-ps transient complex conductivity using THz time-domain spectroscopy. The results show that the quantum efficiency of charge generation is two orders of magnitude smaller in solution (~10–5) than in the solid film (~10–3). The proximity of neighboring chains in the films apparently facilitates (hot) exciton dissociation, presumably by allowing the electron and hole to separate on different polymer strands. For both samples, photoexcitation leads to the predominant formation of bound charge pairs (excitons) that can be detected through their polarizability. Surprisingly, the polarizability per absorbed photon is a factor of 3 larger in solution than in the film, suggesting that interchain interactions in the film do not result in a substantial delocalization of the exciton wave function. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/157795
- author
- Hendry, E ; Koeberg, M ; Schins, J M ; Nienhuys, Han-Kwang LU ; Sundström, Villy LU ; Siebbeles, L D A and Bonn, M
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B (Condensed Matter and Materials Physics)
- volume
- 71
- issue
- 12
- pages
- 1 - 125201
- publisher
- American Physical Society
- external identifiers
-
- wos:000228923300061
- scopus:20144367234
- ISSN
- 1098-0121
- DOI
- 10.1103/PhysRevB.71.125201
- 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
- 768aa071-dc37-4d06-9a8d-d7a453ec785d (old id 157795)
- date added to LUP
- 2016-04-01 16:15:56
- date last changed
- 2022-04-22 20:47:17
@article{768aa071-dc37-4d06-9a8d-d7a453ec785d, abstract = {{We compare the generation and decay dynamics of charges and excitons in a model polymer semiconductor (MEH-PPV) in solution and drop-cast thin films, by recording the sub-ps transient complex conductivity using THz time-domain spectroscopy. The results show that the quantum efficiency of charge generation is two orders of magnitude smaller in solution (~10–5) than in the solid film (~10–3). The proximity of neighboring chains in the films apparently facilitates (hot) exciton dissociation, presumably by allowing the electron and hole to separate on different polymer strands. For both samples, photoexcitation leads to the predominant formation of bound charge pairs (excitons) that can be detected through their polarizability. Surprisingly, the polarizability per absorbed photon is a factor of 3 larger in solution than in the film, suggesting that interchain interactions in the film do not result in a substantial delocalization of the exciton wave function.}}, author = {{Hendry, E and Koeberg, M and Schins, J M and Nienhuys, Han-Kwang and Sundström, Villy and Siebbeles, L D A and Bonn, M}}, issn = {{1098-0121}}, language = {{eng}}, number = {{12}}, pages = {{1--125201}}, publisher = {{American Physical Society}}, series = {{Physical Review B (Condensed Matter and Materials Physics)}}, title = {{Interchain effects in the ultrafast photophysics of a semiconducting polymer: THz time-domain spectroscopy of thin films and isolated chains in solution}}, url = {{http://dx.doi.org/10.1103/PhysRevB.71.125201}}, doi = {{10.1103/PhysRevB.71.125201}}, volume = {{71}}, year = {{2005}}, }