Extraction current transients for mobility determination-A comparative study

Staffan Dahlström*, Christian Ahläng, Kim Björkström, Sofia Forsblom, Benjamin Granroth, Kaj Jansson, Axel Luukkonen, Muhammad Talha Masood, Julie Poulizac, Syeda Qudsia, Mathias Nyman

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
5 Downloads (Pure)

Abstract

In this work, we measure the hole mobility in the model polymer system poly(3-hexylthiophene-2,5-diyl) by using different measurement techniques. Our main purpose is to determine how the recently developed charge extraction by a linearly increasing voltage technique for metal-insulator-metal devices (MIM-CELIV) compares to other commonly used methods, such as space charge limited currents and time-of-flight. Our findings suggest that the MIM-CELIV technique gives a slightly lower mobility than the other techniques, which is understandable given that the method measures the mobility of relaxed charge carriers in the dark unlike, for example, time-of-flight where charge carriers are photogenerated. In addition, we scrutinize the accuracy and reliability of the techniques used, showing that differences in mobility smaller than a factor of two are not detectable unless statistics from many devices are available.

Original languageEnglish
Article number065203
JournalAIP Advances
Volume10
Issue number6
DOIs
Publication statusPublished - 2 Jun 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • CELIV
  • Charge transport
  • Charge carrier mobility
  • SCLC
  • Time-of-flight
  • Photo-CELIV
  • MIM-CELIV

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