Proceedings of Online Meetup: Origins of Electronic Defects in Halide Perovskites (EDHP)
Publication date: 1st April 2020
Over the last decade solution-processed metal halide perovskites quickly grew from a mere scientific sensation to a tangible photovoltaic technology, being on the brink of commercial entrance. Power conversion efficiencies recorded for these devices exceeded 25% of a certified value. However, there still remain many unanswered questions and scope for further advancement, particularly in better understanding of the formation process of polycrystalline thin film of these materials. Insight into the interplay between colloidal precursor solution and nucleation of perovskite crystallites is highly desirable in order to obtain well controlled crystallization process, essential for reproducible manufacturing at large scale. Here, we report a novel synthetic route of methylammonium iodide (CH3NH3I, MAI), which produces ultra-pure material with a cheap and simple method. We demonstrate that MAI made this way allows to obtain better control over perovskite precursor colloidal solution. Furthermore, we fabricated MAPbI3 perovskite layers processed from solutions formulated with different MAI powders, and apply these films into a simple planar heterojunction solar cell stack. Through photovoltaic performance characterization and multiple spectroscopic measurements, we demonstrate superior optoelectronic properties of samples made with an optimized ink formulation (MAI made with a new synthetic route combined with controlled addition of impurities). We demonstrate the influence of a precursor solution and its colloidal distribution on the final film properties. The reported synthetic protocol is also applicable to other alkylammonium iodides, which face similar problem of uncontrolled amount of impurities.
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