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Supplementary material from "Investigating the Encapsulation of Lead Bromide Perovskite with Poly(3-bromothiophene) for Improved Aqua Stability and Enhanced Fluorescence Memory"

Posted on 2025-02-03 - 05:40
Formamidinium lead bromide (FAPbBr₃) perovskites are promising candidates for optoelectronic applications due to their exceptional semiconducting and photoluminescent properties. However, their high sensitivity to environmental factors like moisture and polar solvents limits their long-term stability, posing a barrier to commercial applications. This study addresses this stability challenge by encapsulating FAPbBr₃ in poly(3-bromothiophene) (PTBr), a high-molecular-weight conducting polymer, to enhance resistance to aqueous and solvent-based degradation. The PTBr encapsulation was found to significantly improve the thermal and environmental stability of FAPbBr₃, as evidenced by thermogravimetric analysis (TGA), which revealed a reduced and delayed mass loss and an increased residual mass (up to 28.17% in composites with 70% PTBr content). Photoluminescence (PL) studies demonstrated that the encapsulated composites exhibited a mean fluorescence lifetime of 87.4 ns, compared to 12.56% fluorescence retention in unencapsulated FAPbBr₃ after exposure to moisture for 45 days. Moreover, encapsulated FAPbBr₃ retained over 80% of its green light fluorescence intensity even after one year, whereas the unencapsulated sample degraded to less than 5%. Notably, the composites displayed fluorescence recovery upon exposure to polar solvents, further highlighting PTBr’s protective role. These findings provide a practical, non-interacting encapsulation strategy that enhances both the environmental and thermal stability of FAPbBr₃ while preserving its emission characteristics, offering potential to support the further development of perovskite-based optoelectronic devices for practical applications.

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AUTHORS (8)

Debasis Brahma
Jit Santra
Sayan Basak
Subhadeep Chakraborty
Rahul Chatterjee
Suman Acharya
Debdipta Basu
Abhijit Bandyopadhyay
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