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Unraveling Differences in the Effects of Ammonium/Amine-Based Additives on the Performance and Stability of Inverted Perovskite Solar Cells. | LitMetric

AI Article Synopsis

  • - Additive engineering is a strategy used to enhance the performance and stability of perovskite solar cells (PVSCs), with ammonium salts playing a significant role due to their ability to address defects in materials. - A study compares the effectiveness of two ammonium derivatives — phenethylammonium iodide (PEA) and phenethylamine (PEA), revealing that PEA performs significantly better than PEA in terms of defect passivation, hydrophobicity, and overall stability of the solar cells. - The research shows that using PEA as an additive leads to a power conversion efficiency (PCE) increase of about 15%, pushing it above 21%, while also providing better protection against water damage, thermal degradation, and

Article Abstract

Additive engineering, with its excellent ability to passivate bulk or surface perovskite defects, has become a common strategy to improve the performance and stability of perovskite solar cells (PVSCs). Among the various additives reported so far, ammonium salts are considered an important branch. It is worth noting that although both ammonium-based additives (R-NH ) and amine-based additives (R-NH) are derivatives of ammonia (NH), the functions of the two can be easily confused due to their structural similarities. Moreover, there is no comprehensive comparative analysis of them in the literature. Here, the differences between phenethylammonium iodide (PEA) and phenethylamine (PEA) additives are revealed experimentally and theoretically. The results clearly show that PEA outperforms PEA in terms of device performance and stability based on the following three factors: i) PEA's defect passivation capability is superior to that of PEA; ii) PEA has better hydrophobicity to hinder water ingress; and iii) PEA completely improves the stability of PVSCs by enhancing thermal stability and inhibiting iodide migration in perovskite more effectively than PEA. As a result, the power conversion efficiency (PCE) of the inverted methylammonium triiodide (MAPbI) device using PEA increases by ≈15% to over 21%. More importantly, this device exhibits greater ability to prevent water invasion, thermal-induce degradation, and inhibit iodide ion migration, resulting in better long-term stability.

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Source
http://dx.doi.org/10.1002/smtd.202400039DOI Listing

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