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“Visible” Phase Separation of MAPbI3/δ-FAPbI3 Films for High-Performance and Stable Photodetectors
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2021-05-14 , DOI: 10.1002/admi.202100266
Meijia Shang 1 , Gang Lian 1 , Song Lv 1 , Fei Zhu 1 , Qilong Wang 2 , Deliang Cui 1 , Zhaoke Zheng 1 , Baibiao Huang 1
Affiliation  

Simultaneous achievement of elevated photocurrent by increasing grain size of perovskite films and reduced dark current by introducing passivation phase as well as improved stability is significant and tough challenge for perovskite-based photodetector devices. Herein, in-situ formation of “visible” formamidinium lead iodide (δ-FAPbI3) phase within a high-quality methylamine lead iodide (MAPbI3) film is reported by a pressure-induced phase separation strategy. The MAPbI3 single-crystal grains are adequately grown and parts of them are over 20 µm in lateral dimension. More importantly, the incursion of δ-FAPbI3 with high resistance behaves like an organic scaffold to passivate the trap state, limit cation diffusion, and increase intrinsic resistance of the MAPbI3 film. Accordingly, the MAPbI3/δ-FAPbI3 photodetector devices exhibit excellent photoelectrical performance, including high detectivity, responsivity, and on/off ratio due to long carrier lifetime and low defect density. Furthermore, the unsealed MAPbI3/δ-FAPbI3 film device retains over 94% of its initial photocurrent after 15 days in ambient conditions, exhibiting significantly improved stability. The introduction of “useless” δ-FAPbI3 phase in high-quality perovskite films opens up a new way toward improved photoelectrical performance and stability.

中文翻译:

用于高性能和稳定光电探测器的 MAPbI3/δ-FAPbI3 薄膜的“可见”相分离

通过增加钙钛矿薄膜的晶粒尺寸和通过引入钝化相降低暗电流以及提高稳定性来同时实现提高的光电流是基于钙钛矿的光电探测器器件的重大而艰巨的挑战。在此,通过压力诱导相分离策略报道了在高质量甲胺碘化铅 (MAPbI 3 ) 膜内原位形成“可见”甲脒碘化铅 (δ-FAPbI 3 ) 相。MAPbI 3单晶粒充分生长,其中部分横向尺寸超过20μm。更重要的是,δ-FAPbI 3的侵入具有高电阻的材料就像有机支架一样钝化陷阱状态,限制阳离子扩散,并增加 MAPbI 3膜的固有电阻。因此,MAPbI 3 /δ-FAPbI 3光电探测器器件由于载流子寿命长和缺陷密度低而表现出优异的光电性能,包括高探测率、响应率和开/关比。此外,未密封的 MAPbI 3 /δ-FAPbI 3薄膜器件在环境条件下 15 天后仍保持其初始光电流的 94% 以上,表现出显着提高的稳定性。引入“无用”δ-FAPbI 3 高质量钙钛矿薄膜中的相为提高光电性能和稳定性开辟了一条新途径。
更新日期:2021-06-24
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