Mobility and density relaxation of photogenerated charge carriers in organic materials

R. Österbacka*, A. Pivrikas, G. Juška, K. Genevičius, K. Arlauskas, H. Stubb

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

73 Citations (Scopus)

Abstract

We have measured mobility and density relaxation of photogenerated charge carriers in regiorandom poly(3-hexylthiophene) using novel extraction current transient techniques. We show how to obtain time-dependent mobility μ and charge carrier density p using independent measurements. The results show μ∝t -0.42 independent on charge carrier density. The carrier density follows a bimolecular decay with the bimolecular recombination coefficient β=7.2×10-13 cm3/s. The measured time-of-flight current follows closely the estimated time decay as j(t)∝p(t)μ(t), with deviation arising from extraction of the generated charge carriers.

Original languageEnglish
Pages (from-to)534-538
Number of pages5
JournalCurrent Applied Physics
Volume4
Issue number5
DOIs
Publication statusPublished - Aug 2004
MoE publication typeA1 Journal article-refereed

Keywords

  • Extraction current transients
  • Gaussian disorder
  • Time-of-flight
  • Transport

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