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Article Dans Une Revue Small Année : 2023

Bidirectional Anions Gathering Strategy Afford Efficient Mixed Pb-Sn Perovskite Solar Cells

Yuli Tao
  • Fonction : Auteur
Zheng Liang
  • Fonction : Auteur
Jiajiu Ye
Huifen Xu
  • Fonction : Auteur
Guozhen Liu
  • Fonction : Auteur
Dmitry Aldakov
  • Fonction : Auteur
Xu Pan
Xingyou Tian

Résumé

Abstract Mixed lead-tin (Pb-Sn) perovskite solar cells (PSCs) possess low toxicity and adjustable bandgap for both single-junction and all-perovskite tandem solar cells. However, the performance of mixed Pb-Sn PSCs still lags behind the theoretical efficiency. The uncontrollable crystallization and the resulting structural defect are important reasons. Here, the bidirectional anions gathering strategy (BAG) is reported by using Methylammonium acetate (MAAc) and Methylammonium thiocyanate (MASCN) as perovskite bulk additives, which Ac− escapes from the perovskite film top surface while SCN− gathers at the perovskite film bottom in the crystallization process. After the optoelectronic techniques, the bidirectional anions movement caused by the top-down gradient crystallization is demonstrated. The layer-by-layer crystallization can collect anions in the next layer and gather at the broader, enabling a controllable crystallization process, thus getting a high-quality perovskite film with better phase crystallinity and lower defect concentration. As a result, PSCs treated by the BAG strategy exhibit outstanding photovoltaic and electroluminescent performance with a champion efficiency of 22.14%. Additionally, it demonstrates excellent long-term stability, which retains ≈92.8% of its initial efficiency after 4000 h aging test in the N2 glove box.
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Dates et versions

hal-04171477 , version 1 (16-11-2023)

Identifiants

Citer

Yuli Tao, Zheng Liang, Jiajiu Ye, Huifen Xu, Guozhen Liu, et al.. Bidirectional Anions Gathering Strategy Afford Efficient Mixed Pb-Sn Perovskite Solar Cells. Small, 2023, 19 (20), ⟨10.1002/smll.202207480⟩. ⟨hal-04171477⟩
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