More than 20% effectiveness organic photovoltaic

• Efficient photon utilization is the key to realize high-performance organic photovoltaic (OPV ) cells. Recently, the Chinese Academy of Sciences has improved the photon utilization efficiency of high-performance organic photovoltaic cells by adjusting the phase change dynamics. By regulating the kinetics of donor and receptor phase transitions. Multi-scale fiber network morphology was constructed in the system based on PBQx TCl: PBDB-TF: eC9-2Cl, and its unique phase transformation process and crystal size were systematically studied. PBQx-TCl and eC9-2Cl form a fiber structure with a diameter of about 25 nm in the ternary membrane. In addition, the fibers assembled by PBDB-TF are uniformly distributed on the fiber network of PBQx-TCl and eC9-2Cl.
• The ideal multi-scale fiber network configuration makes the ternary system have better charge transfer and transmission process than the binary system; These improvements enhance the efficiency of photon utilization. The author achieved a high power conversion efficiency of 19.51% in the single-junction OPV battery, and the external quantum efficiency of the ternary battery exceeded 85% in the wide range of 500 – 800 nm. The author also made a series OPV battery, which can increase the solar photon absorption, and the series battery has more than 20% excellent PCE.
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• Pengqing Bi et.al Enhancing Photon Utilization Efficiency for High-Performance Organic Photovoltaic Cells via Regulating Phase Transition Kinetics Adv. Mater. 2023

  
  

  DOI: 10.1002/adma.202210865

  
  

  https://doi.org/10.1002/adma.202210865