Boosting Charge Transport in a 2D/3D Perovskite Heterostructure by Selecting an Ordered 2D Perovskite as the Passivator
Boosting Charge Transport in a 2D/3D Perovskite Heterostructure by Selecting an Ordered 2D Perovskite as the Passivator
复制标题
通过选择有序 2D 钙钛矿作为钝化剂来促进 2D/3D 钙钛矿异质结构中的电荷传输
DOI：
10.1002/anie.202214208
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Ye Shuji
中科院分区：
文献类型：
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作者：
Li Chuanzhao;Zhu Renlong;Yang Zhe;Lai Jing;Tan Junjun;Luo Yi;Ye Shuji
我们证明了有序的二维钙钛矿可以显著提高二维/三维钙钛矿异质结构的光电性能。采用选择性氟化苯乙基铵（PEA）碘化铅钝化3D FA0.8Cs0.2PbI3，我们发现，高阶2D钙钛矿钝化后的2D/3D钙钛矿异质结构具有较低的厄巴赫能，在一定2D钙钛矿含量下，光致发光（PL）强度、PL寿命、载流子迁移率（ϕμ）和载流子扩散长度（LD）显著增加。采用16.67%的对氟PEA2PbI4钝化后，在2D/3D薄膜中获得了超长PL寿命≈1.3 μs，高ϕμof≈18.56 cm2V−1s−1，长ldof≈7.85 μm的高性能。该载流子扩散长度与某些钙钛矿单晶（bbb50 μm）相当。这些发现提供了2D钙钛矿有机阳离子如何影响2D/3D钙钛矿异质结构性能的关键缺失信息。
We demonstrate that an ordered 2D perovskite can significantly boost the photoelectric performance of 2D/3D perovskite heterostructures. Using selective fluorination of phenyl‐ethyl ammonium (PEA) lead iodide to passivate 3D FA0.8Cs0.2PbI3, we find that the 2D/3D perovskite heterostructures passivated by a higher ordered 2D perovskite have lower Urbach energy, yielding a remarkable increase in photoluminescence (PL) intensity, PL lifetime, charge‐carrier mobilities (ϕμ), and carrier diffusion length (LD) for a certain 2D perovskite content. High performance with an ultralong PL lifetime of ≈1.3 μs, highϕμof ≈18.56 cm2V−1s−1, and longLDof ≈7.85 μm is achieved in the 2D/3D films when passivated by 16.67 % para‐fluoro‐PEA2PbI4. This carrier diffusion length is comparable to that of some perovskite single crystals (>5 μm). These findings provide key missing information on how the organic cations of 2D perovskites influence the performance of 2D/3D perovskite heterostructures.