Deep energetic trap states in organic photovoltaic devices

Christopher G. Shuttle, Neil D. Treat, Jessica D. Douglas, Jean Frechet, Michael L. Chabinyc

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


The nature of energetic disorder in organic semiconductors is poorly understood. In photovoltaics, energetic disorder leads to reductions in the open circuit voltage and contributes to other loss processes. In this work, three independent optoelectronic methods were used to determine the long-lived carrier populations in a high efficiency N-alkylthieno[3,4-c]pyrrole-4,6-dione (TPD) based polymer: fullerene solar cell. In the TPD co-polymer, all methods indicate the presence of a long-lived carrier population of ∼ 10 15 cm -3 on timescales ≤100 μs. Additionally, the behavior of these photovoltaic devices under optical bias is consistent with deep energetic lying trap states. Comparative measurements were also performed on high efficiency poly-3-hexylthiophene (P3HT): fullerene solar cells; however a similar long-lived carrier population was not observed. This observation is consistent with a higher acceptor concentration (doping) in P3HT than in the TPD-based copolymer. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish (US)
Pages (from-to)111-119
Number of pages9
JournalAdvanced Energy Materials
Issue number1
StatePublished - Nov 23 2011

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Work at UCSB was supported as part of the Center for Energy Efficient Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001009 and at UCB by the "Plastics Electronics" program at Lawrence Berkeley National Laboratory funded by the Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. We thank Claudia Piliego and Claire H. Woo for advice about device fabrication with PBDTTPD.

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science


Dive into the research topics of 'Deep energetic trap states in organic photovoltaic devices'. Together they form a unique fingerprint.

Cite this