Doping-induced carrier profiles in organic semiconductors determined from capacitive extraction-current transients

Mathias Nyman, Oskar Sandberg, Staffan Dahlström, D Spoltore, C Korner, YD Zhang, S Barlow, SR Marder, K Leo, K Vandewal, Ronald Österbacka

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

A method to determine the doping induced charge carrier profiles in lightly and moderately doped organic semiconductor thin films is presented. The theory of the method of Charge Extraction by a Linearly Increasing Voltage technique in the doping-induced capacitive regime (doping-CELIV) is extended to the case with non-uniform doping profiles and the analytical description is verified with drift-diffusion simulations. The method is demonstrated experimentally on evaporated organic smallmolecule thin films with a controlled doping profile, and solution-processed thin films where the nonuniform doping profile is unintentional, probably induced during the deposition process, and a priori unknown. Furthermore, the method offers a possibility of directly probing charge-density distributions at interfaces between highly doped and lightly doped or undoped layers.
Original languageEnglish
Pages (from-to)
Number of pages9
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • profiles
  • Organic solar cells
  • Extraction current transients
  • doping

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