A Benzo[1,2-b:4,5-b′]Difuran Based Donor Polymer Achieving High-Performance (>17%) Single-Junction Organic Solar Cells with a Fill Factor of 80.4%

Jicheng Yi, Mingao Pan, Lu Chen, Yuzhong Chen*, Indunil Chathurangani Angunawela, Siwei Luo, Ting Zhang, Anping Zeng, Jian Chen, Zhenyu Qi, Han Yu, Wei Liu, Joshua Yuk Lin Lai, Ha Kyung Kim, Xunjin Zhu*, Harald Ade*, Haoran Lin*, He Yan*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

14 Citations (Scopus)

Abstract

In the field of non-fullerene organic solar cells (OSCs), most of the promising polymer donors are based on benzo[1,2-b:4,5-b′]dithiophene (BDT) units while benzo[1,2-b:4,5-b′]difuran (BDF)-based polymers have drawn less attention since the efficiencies of BDF polymer-based devices are generally lower than those of BDT polymer-based ones. In this contribution, the BDT unit in a polymer donor named D18 is replaced with a BDF unit, and a new polymer named D18-Fu is synthesized. As a highly-crystalline molecule named Y6-1O is chosen as the acceptor, the efficiency of binary devices based on D18-Fu can reach 16.38%. Furthermore, when one of fullerene derivatives PC71BM is added, the ternary devices based on D18-Fu achieve an efficiency of 17.07% and a high fill factor (FF) of 80.4%, both of which are the highest values among those of BDF polymer-based devices. For comparison, D18-based ternary devices show an inferior efficiency of 15.61% mainly due to the lower FF of 73.9%. Subsequent characterization reveals that D18-Fu possesses a more coplanar molecular geometry, leading to better morphology and higher charge mobility for a promising FF. The high performance shown in this work demonstrates the potential role of BDF units in the design of polymer donors for highly efficient OSCs.

Original languageEnglish
Article number2201850
Number of pages10
JournalAdvanced Energy Materials
Volume12
Issue number33
Early online date19 Jul 2022
DOIs
Publication statusPublished - 1 Sept 2022

Scopus Subject Areas

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

User-Defined Keywords

  • benzo[1,2-b:4,5-b′]difuran
  • fill factors
  • morphology
  • organic solar cells
  • polymer donors

Fingerprint

Dive into the research topics of 'A Benzo[1,2-b:4,5-b′]Difuran Based Donor Polymer Achieving High-Performance (>17%) Single-Junction Organic Solar Cells with a Fill Factor of 80.4%'. Together they form a unique fingerprint.

Cite this