Details

Autor(en) / Beteiligte

• Xiao, Liangang
• Wu, Xing
• Ren, Guoxing
• Kolaczkowski, Matthew A.
• Huang, Guang
• Tan, Wanyi
• Ma, Lin
• Liu, Yidong
• Peng, Xiaobin
• Min, Yonggang
• Liu, Yi

Titel

Highly Efficient Ternary Solar Cells with Efficient Förster Resonance Energy Transfer for Simultaneously Enhanced Photovoltaic Parameters

Ist Teil von

• Advanced functional materials, 2021-10, Vol.31 (41), p.n/a

Ort / Verlag

Hoboken: Wiley Subscription Services, Inc

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Introducing a third component into organic bulk heterojunction solar cells has become an effective strategy to improve photovoltaic performance. Meanwhile, the rapid development of non‐fullerene acceptors (NFAs) has pushed the power conversion efficiency (PCE) of organic solar cells (OSCs) to a higher standard. Herein, a series of fullerene‐free ternary solar cells are fabricated based on a wide bandgap acceptor, IDTT‐M, together with a wide bandgap donor polymer PM6 and a narrow bandgap NFA Y6. Insights from the morphological and electronic characterizations reveal that IDTT‐M has been incorporated into Y6 domains without disrupting its molecular packing and sacrificing its electron mobility and work synergistically with Y6 to regulate the packing pattern of PM6, leading to enhanced hole mobility and suppressed recombination. IDTT‐M further functions as an energy‐level mediator that increases open‐circuit voltage (VOC) in ternary devices. In addition, efficient Förster resonance energy transfer (FRET) between IDTT‐M and Y6 provides a non‐radiative pathway for facilitating exciton dissociation and charge collection. As a result, the optimized ternary device features a significantly improved PCE up to 16.63% with simultaneously enhanced short‐circuit current (JSC), VOC, and fill factor (FF). A highly crystalline and wide bandgap electron acceptor, IDTT‐M, is used to fabricate high efficiency ternary solar cells with PM6 and another narrow bandgap electron acceptor, Y6. Benefiting from efficient Förster resonance energy transfer, a significantly improved power conversion efficiency of up to 16.63% is achieved with simultaneously enhanced device characteristics.