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Stabilizing Formamidinium Lead Iodide Perovskite Precursor Solution with Phenylboric Acid
Solar RRL ( IF 6.0 ) Pub Date : 2021-01-22 , DOI: 10.1002/solr.202000715 Chen Chen 1, 2 , Yi Rao 2 , Zhipeng Li 2 , Xiao Wang 2 , Guanglei Cui 2 , Wei Wang 1 , Shuping Pang 2
Solar RRL ( IF 6.0 ) Pub Date : 2021-01-22 , DOI: 10.1002/solr.202000715 Chen Chen 1, 2 , Yi Rao 2 , Zhipeng Li 2 , Xiao Wang 2 , Guanglei Cui 2 , Wei Wang 1 , Shuping Pang 2
Affiliation
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The instability of the perovskite precursor solution seriously affects the purity of the perovskite films, which is one of the key factors for the low reproducibility for highly efficient devices. Formamidinium‐based perovskite with more suitable spectral absorption range and higher thermal stability has become the mainstream material. However, the side reactions in pure formamidinium lead iodide solution have not been fully revealed. Herein, it is demonstrated that self‐condensation of formamidinium iodide occurs to form the by‐product s‐triazine, and its content increases with the aging time of the solution. It is also discovered that phenylboric acid (PBA) can effectively inhibit the self‐condensation reaction and the content of the s‐triazine is decreased by more than 95% in the solution aging at 60 °C for 7 days. The PBA used as the stabilizer not only enhances purity and decreases defect density of the perovskite films but also strongly enhances the reproducibility for highly efficient perovskite solar cells.
中文翻译：
用苯硼酸稳定甲酰碘化碘化钙钛矿前体溶液
钙钛矿前体溶液的不稳定性严重影响了钙钛矿薄膜的纯度，这是导致高效器件再现性低的关键因素之一。具有更合适的光谱吸收范围和更高的热稳定性的基于甲ami的钙钛矿已成为主流材料。然而，在纯甲酰胺碘化铅溶液中的副反应尚未完全揭示。本文证明了碘化甲酰胺的自缩合形成副产物s-三嗪，其含量随溶液的老化时间而增加。还发现苯硼酸（PBA）可以有效抑制自缩合反应和S的含量在60°C的溶液中老化7天，三嗪的降幅超过95％。用作稳定剂的PBA不仅提高了钙钛矿薄膜的纯度并降低了钙钛矿薄膜的缺陷密度，而且还大大增强了高效钙钛矿太阳能电池的可重复性。
更新日期：2021-03-10
中文翻译：
用苯硼酸稳定甲酰碘化碘化钙钛矿前体溶液
钙钛矿前体溶液的不稳定性严重影响了钙钛矿薄膜的纯度，这是导致高效器件再现性低的关键因素之一。具有更合适的光谱吸收范围和更高的热稳定性的基于甲ami的钙钛矿已成为主流材料。然而，在纯甲酰胺碘化铅溶液中的副反应尚未完全揭示。本文证明了碘化甲酰胺的自缩合形成副产物s-三嗪，其含量随溶液的老化时间而增加。还发现苯硼酸（PBA）可以有效抑制自缩合反应和S的含量在60°C的溶液中老化7天，三嗪的降幅超过95％。用作稳定剂的PBA不仅提高了钙钛矿薄膜的纯度并降低了钙钛矿薄膜的缺陷密度，而且还大大增强了高效钙钛矿太阳能电池的可重复性。
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