An efficient and stable organic solar cell with balanced crystallization kinetics

• Obtaining controllable morphology in organic solar cells ( OSC s ) has long been sought to improve photovoltaic efficiency and long-term stability. Here, Zhang Yuan from Beihang University , Zhang Xuning from Hebei University , Zhou Huiqiong from the National Center for Nanoscience and others reported an efficient and stable OSCs with balanced crystallization kinetics.

  
  

   Monitored by in situ spectroscopy, the authors found that co-acceptor guests with opposite crystallization tendencies are highly beneficial in achieving synergistic effects in balancing crystallization kinetics, altering phase separation and charge carrier transport behavior. The authors' joint studies with GIWAXS , solid-state NMR , depth-sensitive spectroscopy, and transient photoelectric measurements further reveal the core functionality of co-acceptor guests in exploiting and optimizing crystallization kinetics and vertical phase separation.

  
  

   Based on the multi-receptor model system PM6:BTP-eC9:Y6-1O:PC71BM , the authors obtained a power conversion efficiency ( PCE ) of 19.35% with excellent photostability, and the PCE decayed after about 30 days of continuous irradiation. <20%.

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• Weichao Zhang, et.al A high-efficiency and stable organic solar cell with balanced crystallization kinetics EES 2024

  DOI: 10.1039/D3EE04169G

  https://doi.org/10.1039/D3EE04169G