The Compound Effect of Mg and Tris(2-aminoethyl)amine for Long-Term Phase Stability in the γ-CsPbI3 Perovskite Film The Compound Effect of Mg and Tris(2-aminoethyl)amine for Long-Term Phase Stability in the γ-CsPbI3 Perovskite Film AITranslate

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DOI：https://doi.org/10.1021/acsaelm.3c00748

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Despite the good thermal stability and suitable band gap witnessed in fully inorganic CsPbI3 perovskites, their use in photovoltaic devices is limited due to the lack of long-term phase stability in an ambient environment. Therefore, we demonstrate an effective way of improving long-term ambient and thermal stability along with enhancement in the optoelectronic properties of CsPbI3 thin films. Here, we have shown that the incorporation of Mg and tris(2-aminoethyl)amine (TAEA) in CsPbI3 results in a tremendous increase in thermal as well as ambient stability. It is noted that the presence of both TAEA and Mg is critical for the stabilization of the photoactive black phase of CsPbI3. The TAEA-containing CsPb1–xMgxI3 film is found to be stable for more than 7 months when exposed to continuous heat at 85 °C in an ambient N2 atmosphere. The optimized CsPb0.85Mg0.15I3 film containing TAEA is detected to showcase the superior optoelectronic properties along with greatly enhanced ambient stability of more than 20 days in RH∼60–70%.