Hybrid 2D/3D-perovskites are attracting more interest in the area of organometal halide perovskite solar cells (PSCs) because of their high efficiency and extended environmental stability. The 3D portion in 2D/3D perovskites, serves as an active material with exceptional optoelectronic characteristics (for example excellent light absorption and an extended carrier lifetime), while its 2D counterpart protects against environmental conditions (water and oxygen) and increase the stability of the whole structure. In this study, a hetero-structure 2D/3D is constructed via spin-coating a phenyl-ethyl ammonium bromide (PEABr) solution upon over of (FA_0.6MA_0.4)PbI₃ 3D perovskite films. As compared to their 3D analogs, the PSC devices based on optimized 2D/3D hetero-structures display substantial improvements in photovoltaic efficiency due to the passivation of cationic and halide vacancies on the surface of 3D perovskite for better energy level alignments, longer carrier lifetimes, and fewer defects, which facilitate hole transfer and transport to the hole transport layer and reduce interface recombination centers. The extremely-thin film of 2D perovskite on the top of 3D perovskite boots the stability and reduces the crystal imperfection of 3D perovskite. Furthermore, the PEABr-treated perovskite device has a PCE of 20.57% as compared with the control device, which has a PCE of 17.01%.

混合 2D/3D 钙钛矿因其高效率和广泛的环境稳定性而在有机金属卤化物钙钛矿太阳能电池 (PSC) 领域引起了更多关注。2D/3D 钙钛矿中的 3D 部分用作具有出色光电特性（例如出色的光吸收和延长的载流子寿命）的活性材料，而其 2D 对应物可防止环境条件（水和氧气）并增加其稳定性整体结构。_{在这项研究中，通过在 (FA 0.6} MA _0.4 )PbI ₃上旋涂苯乙基溴化铵 (PEABr) 溶液来构建异质结构 2D/3D3D 钙钛矿薄膜。与它们的 3D 类似物相比，基于优化的 2D/3D 异质结构的 PSC 器件显示出光伏效率的显着提高，这是由于 3D 钙钛矿表面上的阳离子和卤化物空位的钝化，以实现更好的能级排列，更长的载流子寿命，并且缺陷少，有利于空穴传输和传输到空穴传输层，减少界面复合中心。3D钙钛矿顶部的2D钙钛矿极薄薄膜提高了稳定性并减少了3D钙钛矿的晶体缺陷。此外，PEABr 处理的钙钛矿器件的 PCE 为 20.57%，而对照器件的 PCE 为 17.01%。