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Reexamining the Post‐Treatment Effects on Perovskite Solar Cells: Passivation and Chloride Redistribution

Yuan, Ligang ; Wang, Jiarong ; Huang, Peng ; Yin, Qixin ; Zou, Shibing ; Wang, Lipeng ; Zhang, Zheng ; Luo, Huiming ; Liu, Feng ; Qiu, Jianhang ; Xie, Jiangsheng ; Ding, Liming ; Yan, Keyou

Small methods, 2023-03, Vol.7 (3), p.e2201467-n/a [Periódico revisado por pares]

Germany

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  • Título:
    Reexamining the Post‐Treatment Effects on Perovskite Solar Cells: Passivation and Chloride Redistribution
  • Autor: Yuan, Ligang ; Wang, Jiarong ; Huang, Peng ; Yin, Qixin ; Zou, Shibing ; Wang, Lipeng ; Zhang, Zheng ; Luo, Huiming ; Liu, Feng ; Qiu, Jianhang ; Xie, Jiangsheng ; Ding, Liming ; Yan, Keyou
  • Assuntos: 2D passivation ; chloride enrichment ; perovskite solar cells ; post‐treatment ; recombination ; transport
  • É parte de: Small methods, 2023-03, Vol.7 (3), p.e2201467-n/a
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Post‐treatment is an essential passivation step for the state‐of‐the‐art perovskite solar cells (PSCs) but the additional role is not yet exploited. In this work, perovskite film is fabricated under ambient air with wide humidity window and identify that chloride redistribution induced by post‐treatment plays an important role in high performance. The chlorine/iodine ratio on the perovskite surface increases from 0.037 to 0.439 after cyclohexylmethylammonium iodide (CHMAI) treatment and the PSCs deliver a champion power conversion efficiency (PCE) of 24.42% (certificated 23.60%). The maximum external quantum efficiency of electroluminescence (EQEEL) reaches to 10.84% with a radiance of 170 W sr−1 m−2, forming the reciprocity relation between EQEEL and nonradiative open‐circuit voltage loss (86.0 mV). After thermal annealing, 2D component of perovskite will increase while chloride decline, leading to improved photovoltage but reduced fill factor. Hence, it distinguishes that chloride enrichment can improve charge transport/recombination simultaneously and 2D passivation can suppress the nonradiative recombination. Moreover, CHMAI can leverage their roles in charge transport/recombination for better performance than phenylethylammonium iodide (Cl/I = 0.114, PCE = 23.32%), due to the stronger binding energy of Cl−. This work provides the insight that the chloride fixation can improve the photovoltaic performance. This work demonstrates an universal chloride redistribution and passivation induced by post‐treatment. The chloride enrichment on the surface can improve charge transport and the passivation can reduce the recombination. When cyclohexylmethylammonium iodide (CHMAI) post‐treated perovskite film, the Cl/I ratio on surface increased from 0.037 to 0.439, which leveraged their roles in charge transport/recombination. Finally, CHMAI perovskite solar cells deliver a champion power conversion efficiency of 24.42%.
  • Editor: Germany
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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