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Suppressed recombination loss in organic photovoltaics adopting a planar–mixed heterojunction architecture

Jiang, Kui ; Zhang, Jie ; Zhong, Cheng ; Lin, Francis R. ; Qi, Feng ; Li, Qian ; Peng, Zhengxing ; Kaminsky, Werner ; Jang, Sei-Hum ; Yu, Jianwei ; Deng, Xiang ; Hu, Huawei ; Shen, Dong ; Gao, Feng ; Ade, Harald ; Xiao, Min ; Zhang, Chunfeng ; Jen, Alex K.-Y.

Nature energy, 2022-11, Vol.7 (11), p.1076-1086 [Periódico revisado por pares]

London: Nature Publishing Group

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  • Título:
    Suppressed recombination loss in organic photovoltaics adopting a planar–mixed heterojunction architecture
  • Autor: Jiang, Kui ; Zhang, Jie ; Zhong, Cheng ; Lin, Francis R. ; Qi, Feng ; Li, Qian ; Peng, Zhengxing ; Kaminsky, Werner ; Jang, Sei-Hum ; Yu, Jianwei ; Deng, Xiang ; Hu, Huawei ; Shen, Dong ; Gao, Feng ; Ade, Harald ; Xiao, Min ; Zhang, Chunfeng ; Jen, Alex K.-Y.
  • Assuntos: Charge transfer ; Energy conversion efficiency ; Excitons ; Heterojunctions ; Photoelectric effect ; Photoelectric emission ; Photovoltaic cells ; Photovoltaics ; Recombination ; Solar cells
  • É parte de: Nature energy, 2022-11, Vol.7 (11), p.1076-1086
  • Descrição: At present, high-performance organic photovoltaics mostly adopt a bulk-heterojunction architecture, in which exciton dissociation is facilitated by charge-transfer states formed at numerous donor–acceptor (D-A) heterojunctions. However, the spin character of charge-transfer states originated from recombination of photocarriers allows relaxation to the lowest-energy triplet exciton (T1) at these heterojunctions, causing photocurrent loss. Here we find that this loss pathway can be alleviated in sequentially processed planar–mixed heterojunction (PMHJ) devices, employing donor and acceptor with intrinsically weaker exciton binding strengths. The reduced D-A intermixing in PMHJ alleviates non-geminate recombination at D-A contacts, limiting the chance of relaxation, thus suppressing T1 formation without sacrificing exciton dissociation efficiency. This resulted in devices with high power conversion efficiencies of >19%. We elucidate the working mechanisms for PMHJs and discuss the implications for material design, device engineering and photophysics, thus providing a comprehensive grounding for future organic photovoltaics to reach their full promise.Organic solar cells with a bulk-heterojunction architecture suffer from photocurrent loss driven by triplet states. Now, Jiang et al. show that sequentially deposited donor–acceptor planar–mixed heterojunctions suppress triplet formation, enabling efficiencies over 19%.
  • Editor: London: Nature Publishing Group
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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