Tandem Polymer Solar Cells Featuring a Spectrally Matched Low-Bandgap Polymer

Letian Dou, Jingbi You, Jun Yang, Chun Chao Chen, Youjun He, Seiichiro Murase, Tom Moriarty, Keith Emery, Gang Li, Yang Yang

Research output: Contribution to journalArticlepeer-review

1409 Scopus Citations


Tandem solar cells provide an effective way to harvest a broader spectrum of solar radiation by combining two or more solar cells with different absorption bands. However, for polymer solar cells, the performance of tandem devices lags behind single-layer solar cells mainly due to the lack of a suitable low-bandgap polymer. Here, we demonstrate highly efficient single and tandem polymer solar cells featuring a low-bandgap conjugated polymer (PBDTT-DPP: bandgap, ∼1.44 eV). A single-layer device based on the polymer provides a power conversion efficiency of ∼6%. When the polymer is applied to tandem solar cells, a power conversion efficiency of 8.62% is achieved, which is, to the best of our knowledge, the highest certified efficiency for a polymer solar cell to date.

Original languageAmerican English
Pages (from-to)180-185
Number of pages6
JournalNature Photonics
Issue number3
StatePublished - Mar 2012

NREL Publication Number

  • NREL/JA-5200-52653


  • cell characterization
  • low-bandgap polymer
  • solar cells
  • tandem devices


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