Comparison of additive amount used in spin-coated and roll-coated organic solar cells

Pei Cheng, Yuze Lin, Natalia Klaudia Zawacka, Thomas Rieks Andersen, Wenqing Liu, Eva Bundgaard, Mikkel Jørgensen, Hongzheng Chen, Frederik C Krebs, Xiaowei Zhan

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

All-polymer and polymer/fullerene inverted solar cells were fabricated by spin-coating and roll-coating processes. The spin-coated small-area (0.04 cm(2)) devices were fabricated on indium tin oxide (ITO) coated glass substrates in nitrogen. The roll-coated large-area (1.0 cm(2)) devices were prepared on ITO-free flexible substrates under ambient conditions. The use of a solvent additive, 1,8-diiodooctane (DIO), facilitated phase separation and enhanced power conversion efficiencies (PCEs). The PCE of polymer/fullerene solar cells increased from 4.58% to 8.12% with 2.5% (v/v) DIO when using the spin-coating process, and increased from 1.37% to 2.09% with 5% (v/v) DIO in the roll-coating process. The PCE of all-polymer solar cells increased from 1.44% to 3.51% with 4% (v/v) DIO when employing the spin-coating process. For the roll-coated large area devices the PCE increased from 0.15% to 0.73% with 9% (v/v) DIO. The optimal amounts of DIO, when using the roll-coating process for the two different active layers (5% and 9% respectively) are significantly higher than those for the spin-coating process (2.5% and 4%, respectively), which is ascribed to a fundamentally different drying mechanism.
Original languageEnglish
JournalJournal of Materials Chemistry A
Volume2
Issue number45
Pages (from-to)19542-19549
Number of pages8
ISSN2050-7488
DOIs
Publication statusPublished - 2014

Keywords

  • CHEMISTRY,
  • ENERGY
  • MATERIALS
  • BULK-HETEROJUNCTION
  • HIGH-PERFORMANCE
  • EFFICIENCY ENHANCEMENT
  • PHOTOVOLTAIC POLYMERS
  • SOLVENT ADDITIVES
  • SELF-ORGANIZATION
  • DEVICE EFFICIENCY
  • SMALL MOLECULES
  • ACTIVE LAYERS
  • SIDE-CHAINS

Projects

Danish-Chinese Center for Organic based Photovoltaic Cells with Morphology Control

Oksbjerg, B., Trofod, T., Bundgaard, E., Andreasen, J. W., Norrman, K., Krebs, F. C., Zawacka, N. K., Jørgensen, M., Angmo, D., Andersen, T. R., Bentzen, J. J. & Rossander, L. H.

31/08/201031/08/2016

Project: Research

Cite this

Cheng, P., Lin, Y., Zawacka, N. K., Andersen, T. R., Liu, W., Bundgaard, E., Jørgensen, M., Chen, H., Krebs, F. C., & Zhan, X. (2014). Comparison of additive amount used in spin-coated and roll-coated organic solar cells. Journal of Materials Chemistry A, 2(45), 19542-19549. https://doi.org/10.1039/c4ta04906c