Effect of Thermal Annealing on Charge Transfer States and Charge Trapping in PCDTBT:PC70BM Solar Cells

Iordania Constantinou, Tzung-Han Lai, Hsien-Yi Hsu, Sin-Hang Cheung, Erik D. Klump, Kirk S. Schanze, Shu-Kong So, Franky So*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

32 Citations (Scopus)

Abstract

The impact of thermal annealing on charge transfer (CT) states in poly[N-9″-hepta-decanyl-2,7-carbazole- alt -5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT):[6,6]-phenyl C71 butyric acid methyl ester (PC70BM) bulk heterojunction solar cells is analyzed. Thermal annealing is found to increase the effectiveness of the CT states, facilitating exciton dissociation and carrier generation. An increase in the concentration of deep traps due to annealing is presented using mid-gap photothermal deflection spectroscopy, resulting in suboptimal overall device performance.
Original languageEnglish
Article number1500167
JournalAdvanced Electronic Materials
Volume1
Issue number9
Early online date8 Jul 2015
DOIs
Publication statusPublished - Sept 2015

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials

User-Defined Keywords

  • charge transfer states
  • exciton dissociation
  • organic solar cells
  • photothermal deflection spectroscopy
  • thermal annealing

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