Doping-Induced Absorption Bands in P3HT: Polarons and Bipolarons
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F16%3AN0000071" target="_blank" >RIV/00177016:_____/16:N0000071 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1002/cphc.201600961" target="_blank" >http://dx.doi.org/10.1002/cphc.201600961</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/cphc.201600961" target="_blank" >10.1002/cphc.201600961</a>
Alternative languages
Result language
angličtina
Original language name
Doping-Induced Absorption Bands in P3HT: Polarons and Bipolarons
Original language description
In this work, we focus on the formation of different kinds of charge carriers such as polarons and bipolarons upon p-type doping (oxidation) of the organic semiconductor poly(3- hexylthiophene-2,5-diyl) (P3HT). We elucidate the cyclic voltammogram during oxidation of this polymer and present spectroscopic changes upon doping in the UV/Vis/near-IR range as well as in the mid-IR range. In the low-oxidation regime, two absorption bands related to sub-gap transitions appear, one in the UV/Vis range and another one in the mid-IR range. The UV/Vis absorption gradually decreases upon further doping while the mid-IR absorption shifts to lower energy. Additionally, electron paramagnetic resonance (EPR) measurements are performed, showing an increase of the EPR signal up to a certain doping level, which significantly decreases upon further doping. Furthermore, the absorption spectra in the UV/Vis range are analyzed in relation to the morphology (crystalline vs. amorphous) by using theoretical models. Finally, the calculated charge carriers from cyclic voltammogram are linked together with optical transitions as well as with the EPR signals upon p-type doping. We stress that our results indicate the formation of polarons at low doping levels and the existence of bipolarons at high doping levels. The presented spectroscopic data are an experimental evidence of the formation of bipolarons in P3HT.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10401 - Organic chemistry
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
A european journal of chemical physics and physical chemistry
ISSN
1439-4235
e-ISSN
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Volume of the periodical
17
Issue of the periodical within the volume
23
Country of publishing house
DE - GERMANY
Number of pages
9
Pages from-to
3836–3844
UT code for WoS article
000389534800002
EID of the result in the Scopus database
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