Porphyrin-diindenothieno[2,3-b]thiophene alternating copolymer-a blue-light harvester in ternary-blend polymer solar cells

Yu Chun Wu, Yi Hsiang Chao, Chien-Lung Wang, Chun Ta Wu, Chain-Shu Hsu*, Yu Ling Zeng, Ching Yao Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Porphyrin, despite chosen by Nature as light harvesting units, hasn't revealed its full potentials as a structural unit in porphyrin-incorporated polymers (PPors). A novel PPor was synthesized to investigate the origins of the low performances of PPor-based polymer solar cells (PSCs). The polymer features broad absorption in the blue-light region, because the diindenothieno[2,3-b] thiophene (DITT) unit extended the conjugation in the polymer backbone. PPor-DITT/PC 71BM based PSCs have a high V oc (0.79 V). Their low J sc and fill factor (FF) were attributed to the un-optimized morphology, as indicated by the photoluminescence quenching and atomic force microscopy (AFM) experiments. Using PPor-DITT as a blue-light harvesting dopant in an amorphous host leverage the strong 400-550 nm absorption of PPor-DITT and circumvent the difficulties in reaching optimized morphology in the PPor/PCBM thin films. An addition of 2 wt % of PPor-DITT in ternary-blend PSCs resulted in a 10 % increase of external quantum efficiency (EQE) in the blue-light region. However, in a crystalline host, the dopant decreased the crystallinity of the host and led to large drops in FF and power conversion efficiencies (PCEs). The study provides an alternative route and expands the application of PPors in PSCs as a blue-light harvester in ternary-blend PSCs using amorphous polymers as host.

Original languageEnglish
Pages (from-to)5032-5040
Number of pages9
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume50
Issue number24
DOIs
StatePublished - 15 Dec 2012

Keywords

  • blends
  • bulk heterojunction
  • conjugated polymers
  • morphology
  • polymer blends
  • porphyrin
  • solar cells

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