N-methyl-2-pyrrolidone Iodide as Functional Precursor Additive for Record Efficiency 2D Ruddlesden-Popper (PEA)(2)(Cs)(n)-1PbnI3n+1 Solar Cells
N-methyl-2-pyrrolidone Iodide as Functional Precursor Additive for Record Efficiency 2D Ruddlesden-Popper (PEA)(2)(Cs)(n)-1PbnI3n+1 Solar Cells
复制标题
N-甲基-2-吡咯烷酮碘化物作为功能性前驱体添加剂，实现创纪录的效率 2D Ruddlesden-Popper (PEA)(2)(Cs)(n)-1PbnI3n 1 太阳能电池
DOI：
10.1002/adfm.202106380
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发表时间：
2021
影响因子：
19
通讯作者：
Jin Zhiwen
中科院分区：
文献类型：
--
作者：
Li Zhizai;Ma Bo;Xu Youkui;Lei Yutian;Lan Wei;Wang Gang;Li Wenquan;Wang Qiang;Zhang Hao-Li;Jin Zhiwen
2D钙钛矿（PEA）2（Cs）n− 1 PbnI 3 n +1（PEA：苯基乙基铵）在环境条件下比其3D组分具有更强的相稳定性，因此近年来受到了极大的关注。然而，（PEA）2（Cs）n− 1 PbnI 3 n +1中不可控的结晶动力学导致难以控制薄膜形貌和相取向调节，导致功率转换效率（PCE）差。在此，通过引入前体添加剂N-甲基-2-碘化吡咯烷酮（NMPI），有效地调节了（PEA）2（Cs）n-1 PbnI 3 n +1膜沉积期间的结晶速率。因此，2D或准2D钙钛矿太阳能电池（PSC）在所有报道的2D或准2D CsPbX 3家族中提供了创纪录的PCE，例如，准2D（n= 20）CsPbI 3 PSC表现出14.59%的创纪录PCE，显示出显著增强的稳定性。详细的表征表明，NMPI与前体中的二甲基碘化铵（DMAI）形成氢键，以控制结晶速率，从而获得具有小波动的平滑形态，这导致提高的载流子寿命和降低的陷阱密度。更重要的是，飞秒瞬态吸收（fs-TA）测量证实了准二维钙钛矿薄膜中改善的相纯度和抑制的非辐射复合。据信，这种简单的添加剂策略为解决2D和准2D CsPbX 3的相变和结晶动力学问题铺平了新的途径。
2D perovskite (PEA)2(Cs)n−1PbnI3n+1(PEA: phenylethylammonium) exhibits more strengthened phase stability than its 3D components under ambient conditions and hence gained great attention in recent years. However, uncontrollable crystallization kinetics in (PEA)2(Cs)n−1PbnI3n+1leads to difficulty in controlling film morphology and phase‐orientation regulation, resulting in poor power conversion efficiency (PCE). Herein, by incorporating precursor additiveN‐methyl‐2‐pyrrolidone iodide (NMPI), the crystallization rate during the deposition of (PEA)2(Cs)n−1PbnI3n+1film is efficiently regulated. As a result, the 2D or quasi‐2D perovskite solar cell (PSC) delivers record PCEs in all reported 2D or quasi‐2D CsPbX3families, for instance, the quasi‐2D (n= 20) CsPbI3PSC exhibits a record PCE of 14.59%, showing significantly enhanced stability. Detailed characterization reveals that the NMPI forms hydrogen bonds with dimethylammonium iodide (DMAI) in the precursor to control crystallization rate for a smooth morphology with small fluctuation, which leads to improved carrier lifetime and reduced trap‐density. More importantly, femtosecond transient absorption (fs‐TA) measurements confirm an improved phase purity and the suppressed nonradiative recombination in quasi‐2D perovskite film. It is believed that this simple additive strategy paves a new route for solving phase transition and crystallization kinetic problems in 2D and quasi‐2D CsPbX3.