AM: Efficient photon utilization is the key to realizing high-performance organic photovoltaic (OPV) cellsMore than 20% efficiency! Organic Photovoltaics

• Efficient photon utilization is the key to realize high-performance organic photovoltaic (OPV) cells. Recently, Hou Jianhui, Cui Yong and others from the Chinese Academy of Sciences improved the photon utilization efficiency of high-performance organic photovoltaic cells by adjusting the phase transition kinetics. By modulating the donor and acceptor phase transition kinetics, a multiscale fiber network morphology was constructed in the PBQx TCl:PBDB-TF:eC9-2Cl-based system, and its unique phase transition process and crystal size were systematically investigated. PBQx-TCl ​​and eC9-2Cl formed fibrous structures with a diameter of about 25 nm in the ternary membrane. Furthermore, the fibers assembled by PBDB-TF were evenly distributed on the fiber networks of PBQx-TCl ​​and eC9-2Cl.

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• The ideal multiscale fiber network morphology endows the ternary system with superior charge transfer and transport processes than the binary system; these improvements enhance the photon utilization efficiency. The authors achieved a high power conversion efficiency of 19.51% in a single-junction OPV cell, and the external quantum efficiency of the ternary cell exceeded 85% in a wide range of 500–800 nm. We also fabricated a tandem OPV cell, which can increase solar photon absorption, and the tandem cell has an excellent PCE of more than 20%.
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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

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

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