Fabrication of 2D perovskite layers on 3D perovskite light absorbers, as the perovskite solar cells (PSCs), is being exploited to achieve a high power-conversion efficiency (PCE) along with promising long-term stability. However, to improve the performance of PSCs, an intermediate layer of smart material is required which can facilitate the desired interaction between two perovskite layers. The present work explores the role of 4-methoxyphenethylammonium (MPA⁺) cations as interfacing layer in 2D halide perovskite material towards developing an efficient PSCs. The effect of different ammonium salts (NH₄Cl and NH₄SCN) as additives in mixed halide MPA_0.2MA_0.8PbI₃ is examined and the optoelectronic and photovoltaic responses of the developed PSCs are investigated in detail. Mixed halide MPA_0.2MA_0.8PbI₃ thin film processed with NH₄SCN additive showed an improved morphological and crystalline properties of fabricated PSCs as well as reduced non-radiative charge-carrier recombination rate. The NH₄SCN/MPA_0.2MA_0.8PbI₃ thin film based PSC demonstrated the highest PCE of ~15.1%, which is nearly 10% higher as compared to that of control PSC sample (~13.7%) and NH₄Cl/MPA_0.2MA_0.8PbI₃ thin film PSC (~7.53%). The NH₄SCN/MPA_0.2MA_0.8PbI₃ based PSC with highest efficiency, additionally showed a significantly improved device stability. It retained an efficiency value of ~95% of its initial even after exposure to ambient condition upto 300 h. The presented NH₄SCN/MPA_0.2MA_0.8PbI₃ thin film based PSC with high efficiency and high stability could open new avenues for improving the performance of solar cells and increase their contribution towards generation of renewable energy in future.

在 3D 钙钛矿光吸收器上制造 2D 钙钛矿层，作为钙钛矿太阳能电池 (PSC)，正被用于实现高功率转换效率 (PCE) 以及有希望的长期稳定性。然而，为了提高 PSC 的性能，需要一个智能材料中间层，它可以促进两个钙钛矿层之间所需的相互作用。目前的工作探索了 4-甲氧基苯乙基铵 (MPA ⁺ ) 阳离子作为界面层在二维卤化物钙钛矿材料中对开发高效 PSC 的作用。不同铵盐（NH ₄ Cl 和 NH ₄ SCN）作为添加剂在混合卤化物 MPA _0.2 MA _0.8 PbI _{3中的作用}检查并详细研究了开发的PSC的光电和光伏响应。_{用 NH 4} SCN 添加剂处理的混合卤化物 MPA _0.2 MA _0.8 PbI ₃薄膜显示出改进的制造的 PSC 的形态和结晶性能以及降低的非辐射电荷载流子复合率。NH ₄ SCN/MPA _0.2 MA _0.8 PbI _{3薄膜基 PSC 的 PCE 最高，约为 15.1%，与对照 PSC 样品 (~13.7%) 和 NH 4} Cl/MPA _0.2相比高出近 10% MA _0.8 PbI ₃薄膜 PSC (~7.53%)。具有最高效率的基于NH ₄ SCN/MPA _0.2 MA _0.8 PbI _{3的PSC还显示出显着改善的器件稳定性。}即使在暴露于环境条件长达 300 小时后，它仍保持其初始效率值的约 95%。所提出的具有高效率和高稳定性的NH ₄ SCN/MPA _0.2 MA _0.8 PbI ₃薄膜基PSC可以为提高太阳能电池的性能开辟新的途径，并增加其对未来可再生能源发电的贡献。