Highly efficient polymer tandem cells and semitransparent cells for solar energy

Chih Yu Chang, Lijian Zuo, Hin Lap Yip, Chang Zhi Li, Yongxi Li, Chain Shu Hsu, Yen Ju Cheng, Hongzheng Chen, Alex K Y Jen

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)


Highly efficient tandem and semitransparent (ST) polymer solar cells utilizing the same donor polymer blended with [6,6]-phenyl-C61- butyric acid methyl ester (PC61BM) and [6,6]-phenyl-C 71-butyric acid methyl ester (PC71BM) as active layers are demonstrated. A high power conversion efficiency (PCE) of 8.5% and a record high open-circuit voltage of 1.71 V are achieved for a tandem cell based on a medium bandgap polymer poly(indacenodithiophene-co-phananthrene-quinoxaline) (PIDT-phanQ). In addition, this approach can also be applied to a low bandgap polymer poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′] dithiophene)-alt-4,7-(5-fluoro-2,1,3-benzothia-diazole)] (PCPDTFBT), and PCEs up to 7.9% are achieved. Due to the very thin total active layer thickness, a highly efficient ST tandem cell based on PIDT-phanQ exhibits a high PCE of 7.4%, which is the highest value reported to date for a ST solar cell. The ST device also possesses a desirable average visible transmittance (≈40%) and an excellent color rendering index (≈100), permitting its use in power-generating window applications.

Original languageEnglish
Article number1301645
JournalAdvanced Energy Materials
Issue number7
Publication statusPublished - May 13 2014
Externally publishedYes


  • active layers
  • organic electronics
  • polymer solar cells
  • power conversion efficiency
  • semitransparent solar cell
  • tandem solar cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


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