In situ characterization of lifetime and morphology in operating bulk heterojunction organic photovoltaic devices by impedance spectroscopy

Benjamin J. Leever, Christopher A. Bailey, Tobin J Marks, Mark C Hersam, Michael F. Durstock

Research output: Contribution to journalArticle

164 Citations (Scopus)

Abstract

Time-dependent charge transport in operating poly(3-hexylthiophene):[6,6]- phenyl-C 61-butyric acid methyl ester (P3HT:PCBM) bulk heterojunction organic photovoltaic (OPV) devices has been characterized with impedance spectroscopy. Devices with varied composition and morphology were measured over a range of illumination intensities ranging from dark conditions to 1 sun and applied bias voltages ranging from 0.0 V to 0.75 V. Using an equivalent circuit model, materials properties such as dielectric constant and conductivity were determined and found to be in agreement with values measured by other methods. Average carrier lifetimes were also extracted from the model and found to correlate with measured power conversion efficiencies. At the short circuit condition and ∼1 sun illumination, the average electron lifetime was found to vary from 7.8 to 22 μs for devices with power conversion efficiencies ranging from 2.0 to 2.5%. These results suggest that impedance spectroscopy is an effective tool for predicting how processing parameters can impact device performance in organic bulk heterojunction photovoltaic devices.

Original languageEnglish
Pages (from-to)120-128
Number of pages9
JournalAdvanced Energy Materials
Volume2
Issue number1
DOIs
Publication statusPublished - Jan 2012

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Sun
Conversion efficiency
Heterojunctions
Lighting
Spectroscopy
Butyric acid
Butyric Acid
Carrier lifetime
Bias voltage
Equivalent circuits
Short circuit currents
Charge transfer
Materials properties
Esters
Permittivity
Electrons
Processing
Chemical analysis
poly(3-hexylthiophene)

ASJC Scopus subject areas

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

Cite this

In situ characterization of lifetime and morphology in operating bulk heterojunction organic photovoltaic devices by impedance spectroscopy. / Leever, Benjamin J.; Bailey, Christopher A.; Marks, Tobin J; Hersam, Mark C; Durstock, Michael F.

In: Advanced Energy Materials, Vol. 2, No. 1, 01.2012, p. 120-128.

Research output: Contribution to journalArticle

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