Capacitance Spectroscopy for Quantifying Recombination Losses in Nonfullerene Small-Molecule Bulk Heterojunction Solar Cells

Viktor V. Brus, Christopher M. Proctor, Niva A. Ran, Thuc Quyen Nguyen

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The light intensity dependence of the main photoelectrical parameters of the nonfullerene small-molecule bulk heterojunction (BHJ) solar cells p-DTS(FBTTh2)2:perylene diimide (T1:PDI) shows that the nongeminate recombination losses play an important role in this system. A simple approach for the quantitative analysis of capacitance spectroscopy data of the organic BHJ solar cells, which allows to determine the density of free charge carriers as a function of applied bias under standard working conditions, is demonstrated. Using the proposed capacitance spectroscopic technique, the nongeminate recombination losses in the T1:PDI solar cells are quantitatively characterized in the scope of the bimolecular- and trap-assisted recombination mechanisms. Their contributions are separately analyzed within a wide range of the applied bias.

Original languageEnglish
Article number1502250
JournalAdvanced Energy Materials
Volume6
Issue number11
DOIs
Publication statusPublished - Jun 8 2016
Externally publishedYes

Keywords

  • bulk heterojunction solar cells
  • capacitance
  • charge-carrier recombination
  • impedance

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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