The mobility and decay kinetics of charge carriers in discotic hexabenzocoronenes

J. Piris, M.G. Debije, M.D. Watson, K. Müllen, J.M. Warman

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)

Abstract

The temperature dependence of the mobility and decay kinetics of charge carriers in discotic hexa-peri-hexabonzocoronene derivatives has been measured using the pulse-radiolysis time-resolved microwave conductivity technique (PR-TRMC). For both the racemic and chiral dimethyloctyl, and the isomeric n-decyl substituted derivatives, the mobility decreases at the crystalline solid (K)?liquid crystalline (Col) transition from 0.5±0.1 to 0.30±0.05?cm2?V?1?s?1 with the transition temperature ca. 30?°C lower for the branched chain compounds. The charge recombination kinetics are similar for the branched chain isomers in the Col phase but a faster decay is found for the racemic compound in the K phase. The fact that the mobility values for an asymmetrically substituted butylanthraquinone (C4?AQ) derivative are a factor of 2?3 lower than for the fully hexakis-alkyl substituted compounds is attributed to the similar intracore mobilities for holes and electrons in the latter materials and the electron localization on the AQ moiety in the former. Charge recombination is found to be orders of magnitude faster in the Col phase of the C4?AQ derivative than in the K phase, this is attributed to the motional freedom of the AQ? group in the liquid-crystalline phase.
LanguageEnglish
Pages1047-1052
JournalAdvanced Functional Materials
Volume14
Issue number11
DOIs
StatePublished - 2004

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Charge carriers
charge carriers
Derivatives
Kinetics
kinetics
decay
Crystalline materials
alkyl compounds
Radiolysis
Electrons
Liquids
liquids
radiolysis
Isomers
Superconducting transition temperature
electrons
isomers
transition temperature
Microwaves
microwaves

Cite this

Piris, J. ; Debije, M.G. ; Watson, M.D. ; Müllen, K. ; Warman, J.M./ The mobility and decay kinetics of charge carriers in discotic hexabenzocoronenes. In: Advanced Functional Materials. 2004 ; Vol. 14, No. 11. pp. 1047-1052
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abstract = "The temperature dependence of the mobility and decay kinetics of charge carriers in discotic hexa-peri-hexabonzocoronene derivatives has been measured using the pulse-radiolysis time-resolved microwave conductivity technique (PR-TRMC). For both the racemic and chiral dimethyloctyl, and the isomeric n-decyl substituted derivatives, the mobility decreases at the crystalline solid (K)?liquid crystalline (Col) transition from 0.5±0.1 to 0.30±0.05?cm2?V?1?s?1 with the transition temperature ca. 30?°C lower for the branched chain compounds. The charge recombination kinetics are similar for the branched chain isomers in the Col phase but a faster decay is found for the racemic compound in the K phase. The fact that the mobility values for an asymmetrically substituted butylanthraquinone (C4?AQ) derivative are a factor of 2?3 lower than for the fully hexakis-alkyl substituted compounds is attributed to the similar intracore mobilities for holes and electrons in the latter materials and the electron localization on the AQ moiety in the former. Charge recombination is found to be orders of magnitude faster in the Col phase of the C4?AQ derivative than in the K phase, this is attributed to the motional freedom of the AQ? group in the liquid-crystalline phase.",
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The mobility and decay kinetics of charge carriers in discotic hexabenzocoronenes. / Piris, J.; Debije, M.G.; Watson, M.D.; Müllen, K.; Warman, J.M.

In: Advanced Functional Materials, Vol. 14, No. 11, 2004, p. 1047-1052.

Research output: Contribution to journalArticleAcademicpeer-review

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N2 - The temperature dependence of the mobility and decay kinetics of charge carriers in discotic hexa-peri-hexabonzocoronene derivatives has been measured using the pulse-radiolysis time-resolved microwave conductivity technique (PR-TRMC). For both the racemic and chiral dimethyloctyl, and the isomeric n-decyl substituted derivatives, the mobility decreases at the crystalline solid (K)?liquid crystalline (Col) transition from 0.5±0.1 to 0.30±0.05?cm2?V?1?s?1 with the transition temperature ca. 30?°C lower for the branched chain compounds. The charge recombination kinetics are similar for the branched chain isomers in the Col phase but a faster decay is found for the racemic compound in the K phase. The fact that the mobility values for an asymmetrically substituted butylanthraquinone (C4?AQ) derivative are a factor of 2?3 lower than for the fully hexakis-alkyl substituted compounds is attributed to the similar intracore mobilities for holes and electrons in the latter materials and the electron localization on the AQ moiety in the former. Charge recombination is found to be orders of magnitude faster in the Col phase of the C4?AQ derivative than in the K phase, this is attributed to the motional freedom of the AQ? group in the liquid-crystalline phase.

AB - The temperature dependence of the mobility and decay kinetics of charge carriers in discotic hexa-peri-hexabonzocoronene derivatives has been measured using the pulse-radiolysis time-resolved microwave conductivity technique (PR-TRMC). For both the racemic and chiral dimethyloctyl, and the isomeric n-decyl substituted derivatives, the mobility decreases at the crystalline solid (K)?liquid crystalline (Col) transition from 0.5±0.1 to 0.30±0.05?cm2?V?1?s?1 with the transition temperature ca. 30?°C lower for the branched chain compounds. The charge recombination kinetics are similar for the branched chain isomers in the Col phase but a faster decay is found for the racemic compound in the K phase. The fact that the mobility values for an asymmetrically substituted butylanthraquinone (C4?AQ) derivative are a factor of 2?3 lower than for the fully hexakis-alkyl substituted compounds is attributed to the similar intracore mobilities for holes and electrons in the latter materials and the electron localization on the AQ moiety in the former. Charge recombination is found to be orders of magnitude faster in the Col phase of the C4?AQ derivative than in the K phase, this is attributed to the motional freedom of the AQ? group in the liquid-crystalline phase.

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