Exceeding 14% Efficiency for Solution-Processed Tandem Organic Solar Cells Combining Fullerene- and Nonfullerene-Based Subcells with Complementary Absorption

Bing Guo, Wanbin Li, Guoping Luo, Xia Guo, Huifeng Yao, Maojie Zhang, Jianhui Hou, Yongfang Li, Wai Yeung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

37 Citations (Scopus)


For a highly efficient tandem organic solar cell, it is important for the subcells to minimize the absorption overlap and generate high and balanced currents. Considering the strong absorption and high external quantum efficiency at the short wavelength, developing a highly efficient blend system with a wide-bandgap (WBG) polymer as the donor and a fullerene derivative as the acceptor in the front cell would be an effective strategy. However, it is a challenge to obtain a high short-current density (Jsc) for this blend system. Here, we develop a WBG polymer (PBD1) with an optical bandgap of 1.88 eV. The PBD1:PC71BM blend system with a thickness of 230 nm achieves a power conversion efficiency (PCE) of 9.8% with a high Jsc of 14.6 mA cm-2. When tandem devices are fabricated with PBD1:PC71BM in the front cell, a PCE of 14.2% with a high Jsc of 12.3 mA cm-2 is achieved.

Original languageEnglish
Pages (from-to)2566-2572
Number of pages7
JournalACS Energy Letters
Issue number10
Publication statusPublished - 12 Oct 2018

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

Cite this