N -(2-氨基乙基) 乙酰胺添加剂可为高效自供电光电探测器提供相纯且稳定的 α-FAPbI3,Advanced Materials

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N -(2-氨基乙基) 乙酰胺添加剂可为高效自供电光电探测器提供相纯且稳定的 α-FAPbI3
Advanced Materials ( IF 27.4 ) Pub Date : 2022-10-17 , DOI: 10.1002/adma.202208325
Wenjie Cheng ₁ , Xiang He ₁ , Jian-Gan Wang ₂ , Wei Tian ₁ , Liang Li ₁

Affiliation

甲脒-三碘化铅 (FAPbI ₃ ) 钙钛矿因其窄带隙和优异的热稳定性而被认为是用于高性能光电探测器的最有前途的钙钛矿材料之一。然而，为了实现高效载流子传输和高性能光电探测器，它提出了制造具有纯相、优选晶向、大晶粒尺寸和钝化界面的α-FAPbI ₃的要求，这仍然具有挑战性。在这里，报道了一种基于加成工程的简便策略，通过将N -(2-氨基乙基) 乙酰胺引入钙钛矿前体来获得纯相 FAPbI ₃钙钛矿薄膜。N之间形成化学键和氢键-(2-氨基乙基)乙酰胺和钙钛矿降低了从中间黄相到最终黑相的相变过程中的势垒，钝化了薄膜的缺陷，并导致高质量和相纯的α- FAPbI ₃钙钛矿。基于制造的 FAPbI ₃薄膜的自供电光电探测器在 700 nm 处表现出 0.48 AW ^-1的最大响应度，在 440 nm 处具有 95% 的峰值外量子效率。此外，优化后的器件在环境条件下存储 576 小时后仍保持初始性能的 83%。该工作为制备高质量相纯α-FAPbI ₃钙钛矿及相关器件提供了一种简单可行的方案。

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N -(2-aminoethyl) Acetamide Additive Enables Phase-Pure and Stable α-FAPbI3 for Efficient Self-Powered Photodetectors

Formamidinium–lead triiodide (FAPbI₃) perovskite is considered as one of the most promising perovskite materials for high-performance photodetectors because of its narrow bandgap and superior thermal stability. Nevertheless, to realize efficient carrier transport and highly performing photodetectors, it imposes the requirement of fabricating α-FAPbI₃ with pure phase, preferred crystal orientation, large grain size, and passivated interface, which still remains challenging. Here, a facile strategy based on additive engineering to obtain pure-phase FAPbI₃ perovskite films by introducing N-(2-aminoethyl) acetamide into perovskite precursors is reported. The formation of chemical bond and hydrogen bond between N-(2-aminoethyl) acetamide and perovskite reduces the potential barrier in the phase-transition process from an intermediate yellow phase to a final black phase, passivates the defects of the film, and leads to a high-quality and phase-pure α-FAPbI₃ perovskite. A self-powered photodetector based on the as-fabricated FAPbI₃ film exhibits a maximum responsivity of 0.48 A W⁻¹ at 700 nm with a peak external quantum efficiency of 95% at 440 nm. Moreover, the optimized device remains 83% of the initial performance after 576 h storage at ambient condition. This work provides a simple and feasible scheme for the preparation of high-quality phase-pure α-FAPbI₃ perovskite and associated devices.

更新日期：2022-10-17

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