High-efficiency organic solar cells prepared using a halogen-free solution process

Febrian Tri Adhi Wibowo, Narra Vamsi Krishna, Septy Sinaga, Seung Je Lee, Wisnu Tantyo Hadmojo, Young Rag Do, Sung Yeon Jang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Although the power conversion efficiency (PCE) of organic photovoltaic (OPV) devices has recently improved to more than 16%, halogenated solution processes are typically employed to obtain optimal performance. However, halogenated processing is harmful to health and the environment, which can be a significant obstacle to commercialization. Therefore, development of active materials processable under halogen-free conditions is of great importance in this field. In this study, a 16.04% OPV device, processed under halogen-free conditions, is developed by employing a new active-blend system, PBDTTPD-HT:BTP-2F-BO. It is highly soluble in halogen-free solvents, forming a preferential bulk-heterojunction morphology. The PBDTTPD-HT:BTP-2F-BO device achieves a PCE comparable with current state-of-the-art devices based on PBDB-TF:BTP-4F (also known as PM6:Y6) using a conventional halogenated process (16.40% versus 16.33%). Furthermore, it demonstrates a significantly higher PCE than the PBDB-TF:BTP-4F device with a halogen-free process (16.04% versus 9.70%).

Original languageEnglish (US)
Article number100517
JournalCell Reports Physical Science
Issue number8
StatePublished - Aug 18 2021


  • efficiency
  • halogen-free
  • organic photovoltaic
  • polymer donor
  • small molecule acceptor

ASJC Scopus subject areas

  • General Physics and Astronomy
  • General Materials Science
  • General Chemistry
  • General Energy
  • General Engineering


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