Efficient green solar cells via a chemically polymerizable donor-acceptor heterocyclic pentamer

Jegadesan Subbiah, Pierre Beaujuge, Kaushik Roy Choudhury, Stefan Ellinger, John R. Reynolds, Franky So

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

In this contribution, we report on bulk-heterojunction solar cells using a solution-processable neutral green conjugated copolymer based on 3,4-dioxythiophene and 2,1,3-benzothiadiazole as the donor and [6,6]phenyl-C61 butyric acid methyl ester (PCBM) as the acceptor. We have found that the short-circuit current is very sensitive to the composition of the donor-acceptor blend and it increases with increasing acceptor concentration. The device with a donor-acceptor ratio of 1:8 gives the best performance with a short-circuit current of 5.56 mA/cm 2, an open-circuit voltage of 0.77 V, and a power conversion efficiency of 1.9% under AM 1.5 solar illumination. The incident photon-to-current efficiency (IPCE) of the green solar cells shows two bands, one with a maximum of 57% in the UV region corresponding to absorption of PCBM and a second one with a maximum of 42% at longer wavelengths corresponding to the absorption of the green polymer.

Original languageEnglish (US)
Pages (from-to)1154-1158
Number of pages5
JournalACS Applied Materials and Interfaces
Volume1
Issue number6
DOIs
StatePublished - Jun 24 2009

Keywords

  • bulk heterojunction
  • conjugated polymers
  • donor-acceptor
  • green solar cell
  • low band gap

ASJC Scopus subject areas

  • Materials Science(all)

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