Proceedings of Online Meetup: Contemporary Stability Challenges in Hybrid Perovskite Photovoltaics (SCHP)
Publication date: 14th April 2020
Formamidinium lead iodide (FAPbI3) is one of the most extensively studied perovskite materials due to its narrow band gap and high absorption coefficient, which makes it highly suitable solar cells applications. Deposition from a solution containing lead iodide (PbI2) and formamidinium iodide (FAI) or by sequential deposition of PbI2 and FAI usually leads to the formation of films with poor morphology and unstable crystal structure that readily crystallizes into two different polymorphs: the yellow phase and the black phase. I will show that, 2D 2-phenylethylammonium lead iodide (PEA2PbI4) thin films deposited by a scalable doctor-blade coating technique can be used as a growth template for the high-quality 3D FAPbI3 perovskite thin films, by organic cation exchange. I will discuss the structural, morphological and optical properties of these converted 3D FAPbI3 perovskite films, comparing them to the properties of directly deposited 3D FAPbI3 films. The converted FAPbI3 thin films are compact, smooth, highly oriented and exhibit better structural stability in comparison to the directly deposited 3D films. These results not only underscore the importance of the employed deposition techniques in the formation of highly crystalline and stable perovskite thin films but also reveal a strategy to easily obtain very compact perovskite layers using doctor-blade coating.
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