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Methylammonium Chloride Induces Intermediate Phase Stabilization for Efficient Perovskite Solar Cells

Kim, Minjin ; Kim, Gi-Hwan ; Lee, Tae Kyung ; Choi, In Woo ; Choi, Hye Won ; Jo, Yimhyun ; Yoon, Yung Jin ; Kim, Jae Won ; Lee, Jiyun ; Huh, Daihong ; Lee, Heon ; Kwak, Sang Kyu ; Kim, Jin Young ; Kim, Dong Suk

Joule, 2019-09, Vol.3 (9), p.2179-2192 [Periódico revisado por pares]

Elsevier Inc

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  • Título:
    Methylammonium Chloride Induces Intermediate Phase Stabilization for Efficient Perovskite Solar Cells
  • Autor: Kim, Minjin ; Kim, Gi-Hwan ; Lee, Tae Kyung ; Choi, In Woo ; Choi, Hye Won ; Jo, Yimhyun ; Yoon, Yung Jin ; Kim, Jae Won ; Lee, Jiyun ; Huh, Daihong ; Lee, Heon ; Kwak, Sang Kyu ; Kim, Jin Young ; Kim, Dong Suk
  • Assuntos: additives ; DFT calculation ; high crystallinity ; methylammonium chloride ; perovskite solar cell ; phase stability ; surface morphology
  • É parte de: Joule, 2019-09, Vol.3 (9), p.2179-2192
  • Descrição: One of the most effective methods to achieve high-performance perovskite solar cells has been to include additives that serve as dopants, crystallization agents, or passivate defect sites. Cl-based additives are among the most prevalent in literature, yet their exact role is still uncertain. In this work, we systematically study the function of methylammonium chloride (MACl) additive in formamidinium lead iodide (FAPbI3)-based perovskite. Using density functional theory, we provide a theoretical framework for understanding the interaction of MACl with a perovskite. We show that MACl successfully induces an intermediate to the pure FAPbI3 α-phase without annealing. The formation energy is related to the amount of incorporated MACl. By tuning the incorporation of MACl, the perovskite film quality can be significantly improved, exhibiting a 6× increase in grain size, a 3× increase in phase crystallinity, and a 4.3× increase in photoluminescence lifetime. The optimized solar cells achieved a certified efficiency of 23.48%. [Display omitted] •Improvement of morphology, phase crystallinity, photo-physical property, and efficiency with MACl•Stabilized intermediate to the pure FAPbI3 α-phase with MACl•The formation energy of perovskite structure with the amount of incorporated MACl•Theoretical framework for understanding the interaction of MACl with a perovskite film Numerous effective methods have been developed toward achieving high-performance perovskite solar cells. The additives are one of the most effective ways of achieving high performance. Cl-based additives are among the most prevalent in literature; however, their exact role is still uncertain. Herein, we systematically researched the effects of methylammonium chloride (MACl) additive using analysis of photo-physical properties and density functional theory. The highest efficiency achieved was 24.02%, certified as 23.48%, and the resultant devices showed better thermal stabilities and photostabilities than the pristine devices. Kim and co-workers report systematical studies with methylammonium chloride (MACl) in formamidinium lead iodide (FAPbI3)-based perovskite thin films. The MACl addition could induce the intermediate phase with pure α-phase without annealing, effectively stabilizing the structure, only through cationic site substitution. The film quality can be significantly improved, exhibiting a 6× increase in grain size, a 3× increase in phase crystallinity, and a 4.3× increase in photoluminescence lifetime. The resulting optimized solar cells achieved a peak-scan efficiency of above 24%.
  • Editor: Elsevier Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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