High-Efficiency Organic Tandem Solar Cells With Effective Transition Metal Chelates Interconnecting Layer

Sheng Yung Chang, Yu Che Lin, Pengyu Sun, Yao Tsung Hsieh, Lei Meng, Sang Hoon Bae, Yu Wei Su, Wenchao Huang, Chenhui Zhu, Gang Li, Kung Hwa Wei, Yang Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)


Organic tandem solar cells have two sub-cells vertically connected via a tunnel junction (or interconnecting layer, ICL), which the ICL plays a critical role of determining the performance of the tandem cell. In this manuscript, we report a new design of the ICL consisting of zirconium (IV) acetylacetonate (Zr-Acac) as the electron transport layer. The Zr-Acac has a suitable work function to pin the Fermi-level of the ICL and hence, can effectively behave as the charge recombination function for the tandem device. Comparing to the reference device consisting of ZnO ETL layer, the Zr-Acac ICL can effectively enhance the efficiency by 20%, from 8.4 to 10.1% power conversion efficiencies. More importantly, the Zr-Acac ETL layer functions effectively without thermal annealing, which not only simplifies the tandem solar cell processing, but also widens the front sub-cell material selection.

Original languageEnglish
Article number1700139
JournalSolar RRL
Issue number10
Publication statusPublished - 1 Oct 2017


  • electron transport layer
  • inverted type
  • polymer solar cell
  • tandem

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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