Roll-coating fabrication of flexible large area small molecule solar cells with power conversion efficiency exceeding 1%

Wenqing Liu, Shiyong Liu, Natalia Klaudia Zawacka, Thomas Rieks Andersen, Pei Cheng, Lei Fu, Meirong Chen, Weifei Fu, Eva Bundgaard, Mikkel Jørgensen, Xiaowei Zhan, Frederik C Krebs, Hongzheng Chen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

All solution-processed flexible large area small molecule bulk heterojunction solar cells were fabricated via roll-coating technology. Our devices were produced from slot-die coating on a lab-scale mini roll-coater under ambient conditions without the use of spin-coating or vacuum evaporation methods. Four diketopyrrolopyrrole based small molecules (SMs 1-4) were utilized as electron donors with (6,6)phenyl- C61-butyric acid methyl ester as an acceptor and their photovoltaic performances based on roll-coated devices were investigated. The best power conversion efficiency (PCE) of 1.01%, combined with an open circuit voltage of 0.73 V, a short-circuit current density of 3.13 mA cm (2) and a fill factor of 44% were obtained for the device with SM1, which was the first example reported for efficient roll-coating fabrication of flexible large area small molecule solar cells with PCE exceeding 1%. In addition, rollcoated devices based on SMs 2-4 also showed good performances with PCEs of 0.41%, 0.54%, and 0.31%, respectively. Our results prove that small molecules have the potential for use in industries for large scale production of efficient organic solar cells.
Original languageEnglish
JournalJournal of Materials Chemistry A
Volume2
Issue number46
Pages (from-to)19809-19814
Number of pages6
ISSN2050-7488
DOIs
Publication statusPublished - 2014

Keywords

  • CHEMISTRY,
  • ENERGY
  • MATERIALS
  • ORGANIC PHOTOVOLTAICS
  • PHASE-SEPARATION
  • DIKETOPYRROLOPYRROLE
  • PERFORMANCE
  • DONOR
  • BENZODITHIOPHENE
  • BISADDUCT
  • ACCEPTOR
  • DESIGN
  • PYRENE

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