Novel wide-bandgap non-fullerene acceptors for efficient tandem organic solar cells

Yuliar Firdaus*, Qiao He, Yuanbao Lin, Ferry Anggoro Ardy Nugroho, Vincent M. Le Corre, Emre Yengel, Ahmed H. Balawi, Akmaral Seitkhan, Frédéric Laquai, Christoph Langhammer, Feng Liu, Martin Heeney, Thomas D. Anthopoulos

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


The power conversion efficiency (PCE) of tandem organic photovoltaics (OPVs) is currently limited by the lack of suitable wide-bandgap materials for the front-cell. Here, two new acceptor molecules, namely IDTA and IDTTA, with optical bandgaps (Eoptg) of 1.90 and 1.75 eV, respectively, are synthesized and studied for application in OPVs. When PBDB-T is used as the donor polymer, single-junction cells with PCE of 7.4%, for IDTA, and 10.8%, for IDTTA, are demonstrated. The latter value is the highest PCE reported to date for wide-bandgap (Eoptg ≥ 1.7 eV) bulk-heterojunction OPV cells. The higher carrier mobility in IDTTA-based cells leads to improved charge extraction and higher fill-factor than IDTA-based devices. Moreover, IDTTA-based OPVs show significantly improved shelf-lifetime and thermal stability, both critical for any practical applications. With the aid of optical-electrical device modelling, we combined PBDB-T:IDTTA, as the front-cell, with PTB7-Th:IEICO-4F, as the back-cell, to realize tandem OPVs with open circuit voltage of 1.66 V, short circuit current of 13.6 mA cm-2 and a PCE of 15%; in excellent agreement with our theoretical predictions. The work highlights IDTTA as a promising wide-bandgap acceptor for high-performance tandem OPVs.

Original languageEnglish (US)
Pages (from-to)1164-1175
Number of pages12
Issue number3
StatePublished - 2020

Bibliographical note

Funding Information:
This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR-2018-CARF/ CCF-3079. We thank the China Scholarship Council (CSC) via the CSC Imperial Scholarship and the Royal Society and the Wolfson Foundation (for Royal Society Wolfson Fellowship). C. L. acknowledges nancial support from the Swedish Foundation for Strategic Research Project RMA15-0052.

Publisher Copyright:
© 2019 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science


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