On the validity of MIS-CELIV for mobility determination in organic thin-film devices

Oskar Sandberg, Mathias Nyman, Staffan Dahlström, Simon Sandén, Björn Törngren, Jan-Henrik Smått, Ronald Österbacka

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)
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Abstract

The charge extraction (of injected carriers) by linearly increasing voltage in metal-insulator-semiconductor structures, or MIS-CELIV, is based on the theory of space-charge-limited currents. In this work, the validity of MIS-CELIV for mobility determination in organic thin-film devices has been critically examined and clarified by means of drift-diffusion simulations. It is found that depending on the applied transient voltage, the mobility might be overestimated by several orders of magnitude in the case of an ohmic injecting contact. The shortcomings of the MIS-CELIV theory can be traced back to the underlying assumption of a drift-dominated transport. However, the effect of diffusion can be taken into account by introducing a correction factor. In the case of non-ohmic injecting contacts, the extracted mobility becomes strongly dependent on device parameters, possibly leading to large deviations from the actual mobility.
Original languageEnglish
Pages (from-to)
Number of pages4
JournalApplied Physics Letters
Volume110
Issue number15
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • solar cells
  • Electric contacts
  • Charge carrier mobility
  • Extraction current transients

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