Transient measurements of carrier relaxation time and density in the P3HT: PCBM organic photovoltaic cell

Camron Kouhestani, Duc D. Nguyen, Kenneth E. Kambour, Roderick A.B. Devine, Johnny Chen, Gang Li, Yang Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


The authors have used transient photovoltage measurements to evaluate carrier relaxation times (τ) in P3HT:PCBM based photocells over a wide range of open circuit voltages. Satisfactory agreement is found with data obtained by low frequency impedance measurements. The authors find the differential capacitance measurements yield data consistent with the theoretical value expected based on Langevin recombination. The Langevin coefficient is three orders of magnitude smaller than the theoretical one. For the low light levels, the relaxation time variation is determined by the RC time constant behavior of the photodiode.
Original languageEnglish
Article number032404
JournalJournal of Vacuum Science and Technology B: Nanotechnology and Microelectronics
Issue number3
Publication statusPublished - 1 May 2015
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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