Nature Communications (Oct 2024)

Giant dimeric donors for all-giant-oligomer organic solar cells with efficiency over 16% and superior photostability

  • Caixuan Wang,
  • Xiaoming Ma,
  • Dan Deng,
  • Hao Zhang,
  • Rui Sun,
  • Jianqi Zhang,
  • Lili Zhang,
  • Mengying Wu,
  • Jie Min,
  • Zhi-Guo Zhang,
  • Zhixiang Wei

DOI
https://doi.org/10.1038/s41467-024-52821-5
Journal volume & issue
Vol. 15, no. 1
pp. 1 – 11

Abstract

Read online

Abstract Increasing the molecular weight while maintaining mono-dispersity has been proved crucial in innovating high-performance photovoltaic materials in giant oligomeric acceptors. However, developing efficient giant oligomeric donors to replace the batch-varied polymers remains challenging due to a lack of design principles. Here, by designing two unique isomeric rhodanine-based linkers, we successfully regulate the assembly behaviors of giant dimeric donors (G-Dimer-Ds) and fabricate the first all-giant-oligomer OSCs pairing with giant dimeric acceptor DY. Multiple characterizations demonstrate the small homo-molecular interaction with strong thermal-driven assembly capability in G-Dimer-D2 simultaneously facilitates reducing energetic disorder, improving charge transport and obtaining stable morphology, resulting in a satisfactory efficiency of 15.70% and long-term photostability with an extrapolated T 80 of ca.10,000 hours, and further enhancing thermal-driven assembly promotes efficiency of 16.05%. Our results provide construction approaches on efficient giant donors, and propose a promising type of OSC with completely definite structures, high efficiency and superior stability.