Ruddlesden–Popper Perovskites with Narrow Phase Distribution for Air‐Stable Solar Cells
Ruddlesden–Popper Perovskites with Narrow Phase Distribution for Air‐Stable Solar Cells
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Ruddlesden — 具有窄相分布的波普尔钙钛矿用于空气 — 稳定太阳能电池
DOI：
10.1002/solr.202200490
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发表时间：
2022
期刊：
影响因子：
7.9
通讯作者：
Yu, Qiuming
中科院分区：
文献类型：
--
作者：
Ramakrishnan, Shripathi;Li, Hao;Xu, Yuanze;Shin, Dongyoon;Dursun, Ibrahim;Cotlet, Mircea;Zhang, Yugang;Yu, Qiuming
2D Ruddlesden-Popper钙钛矿因其结构多样性、丰富的光物理特性和低水分侵入性而成为稳定高效的光伏材料。然而，由化学计量前驱体溶液制成的薄膜具有广泛的相分布，不同数量的无机层具有随机的晶体取向，严重影响了器件的性能。研究了甲基氯化铵（MACl）和3 -氨基- 4 -苯酚磺酸（APSA）对垂直取向（PEA） 2ma4pb5i16窄相薄膜制备的影响。MACl在抑制寄生期≤2期和3D样期中起关键作用。通过与Pb2+的强配位，APSA具有钝化陷阱和进一步缩小相多分散性的双重功能。非原位掠入射广角X射线散射（GIWAXS）和超快光谱表征表明，在抗溶剂处理的薄膜中，均匀的混合相分布具有无序的取向，而添加剂辅助热铸处理的结果是定向的、反梯度的相分布，即薄膜表面小而底部大。生成的薄膜使高效的p-i-n太阳能电池的效率达到14.34%，aVocof为1.20 V，在环境条件下（RH = 50-60%） 1440 h后保持96%的初始效率。
2D Ruddlesden–Popper perovskites have risen to prominence as stable and efficient photovoltaic materials because of their structural diversity, rich photophysics, and low moisture ingression. However, thin films processed from stoichiometric precursor solutions possess a broad phase distribution of different number of inorganic layers with random crystal orientation, crippling device performance. The effect of methylammonium chloride (MACl) and 3‐amino‐4‐phenolsulfonic acid (APSA) on the fabrication of perpendicularly oriented (PEA)2MA4Pb5I16films with narrow phase distribution using antisolvent and hot‐casting processing techniques is investigated. MACl plays a critical role in suppressing parasiticn≤ 2 and 3D‐like phases. APSA performs the dual function of trap passivation and further narrowing phase polydispersity through strong coordination with Pb2+. Ex situ grazing‐incident wide‐angle X‐Ray scattering (GIWAXS) and ultrafast spectroscopic characterization reveal uniformly mixed‐phase distribution with disordered orientation in antisolvent treated films, while additive‐assisted hot‐casting treatment results in oriented, reverse‐graded phase distribution, i.e., small‐non the film surface and large‐nat the bottom. Arising thin films enable efficient p–i–n solar cells with an efficiency of 14.34%, and aVocof 1.20 V, retaining 96% initial efficiency after 1440 h under ambient conditions (RH = 50–60%) without encapsulation.