Transient absorption spectroscopy studies on polythiophene-fullerene bulk heterojunction organic blend films sensitized with a low-bandgap polymer

H. Löslein, T. Ameri, G.J. Matt, M. Koppe, H.J. Egelhaaf, A. Troeger, V. Sgobba, D.M. Guldi, C.J. Brabec

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, the concept of near-infrared sensitization is successfully employed to increase the light harvesting in large-bandgap polymer-based solar cells. To gain deeper insights into the operation mechanism of ternary organic solar cells, a comprehensive understanding of charge transfer-charge transport in ternary blends is a necessity. Herein, P3HT:PCPDTBT:PCBM ternary blend films are investigated by transient absorption spectroscopy. Hole transfer from PCPDTBT-positive polarons to P3HT in the P3HT:PCPDTBT:PCBM 0.9:0.1:1 blend film can be visualized. This process evolves within 140 ps and is discussed with respect to the proposed charge-generation mechanisms. Polythiophene-fullerene bulk heterojunction ternary blend films are investigated by transient absorption spectroscopy. Hole transfer from PCPDTBT-positive polarons to P3HT in the blend film can be visualized. This process evolves within 140 ps and is discussed with respect to the proposed charge-generation mechanisms. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish
Pages (from-to)1090-1097
Number of pages8
JournalMacromolecular Rapid Communications
Volume34
Issue number13
DOIs
Publication statusPublished - 2013

Keywords

  • Bulk heterojunction
  • Light-harvesting
  • Low-bandgap polymers
  • Operation mechanism
  • Organic electronics
  • Organic solar cell
  • Polymer-based solar cells
  • Transient absorption spectroscopies
  • Conjugated polymers
  • Energy gap
  • Fullerenes
  • Heterojunctions
  • Photochemical reactions
  • Polarons
  • Solar cells
  • Thin films
  • Polymer films
  • fullerene derivative
  • polymer
  • polythiophene
  • thiophene derivative
  • article
  • chemistry
  • conjugated polymers
  • electrochemical analysis
  • organic electronics
  • photochemistry
  • polymerization
  • solar cells
  • solar energy
  • spectroscopy
  • thin films
  • Electrochemical Techniques
  • Polymerization
  • Polymers
  • Solar Energy
  • Spectrum Analysis
  • Thiophenes

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