Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO25)
Publication date: 24th April 2025
Passivation of surface and interfacial defects remains a key challenge in improving the efficiency of wide bandgap perovskite solar cells (WB-PSCs), particularly for semi-transparent and tandem applications. Poor surface passivation leads to the formation of trap states and increased non-radiative recombination, which reduces the open-circuit voltage (Voc), fill factor (FF), and ultimately the overall device performance. In this work, we employed a dual-passivation approach using spin-coated 2-phenylethylammonium chloride (PEACl) and thermally evaporated magnesium fluoride (MgF₂). PEACl reduces surface defects and enhances moisture resistance, while MgF₂ modifies the interface energetics and facilitates more efficient electron extraction. This dual-layer passivation strategy effectively suppresses non-radiative recombination losses at the perovskite/ETL interface, leading to enhanced charge carrier collection and improved device performance. As a result, the champion semi-transparent device achieved a Voc of 1.17 V, fill factor of 82.81%, and PCE of 17%. This work demonstrates a simple and effective interface engineering route for enhancing the performance of WB-PSCs in tandem configurations.
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