Ultrafast Carrier Diffusion in Perovskite Monocrystalline Films

IF 4.8 2区 化学 Q2 CHEMISTRY, PHYSICAL
Xiayuan Xu, Yan Chen, Yijie Luo, Yuxin Zhang, Yiqun Duan, Yaobin Li, Guanyu Zhang, Zhijian Chen, Shufeng Wang* and Guowei Lu*, 
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引用次数: 0

Abstract

Monocrystalline perovskite materials exhibit superior properties compared with polycrystalline perovskites, including lower defect density, minimal grain boundaries, and enhanced carrier mobility. Nevertheless, the preparation of large-area, high-quality single-crystal films, which could prove invaluable for photoelectronic applications, remains a significant challenge. The study of how their unique properties go beyond polycrystalline thin films is still missing. In our experiment, using polarization-selective transient absorption microscopy, we directly observed the spatial carrier transportation in methylammonium lead iodide (CH3NH3PbI3, MAPbI3) strip-shaped monocrystalline ultrathin films. Ultrafast carrier diffusion transportation was observed. The monocrystalline carrier diffusion coefficient D (∼22 cm2 s–1) is an order of magnitude higher than that in polycrystalline films. Anisotropic carrier diffusion of the MAPbI3 single crystal has been discovered. It is also discovered that the electrons and holes are of different anisotropy and diffusion speed. This ultralong carrier transport inside the monocrystalline film provides solid support for the development of perovskite based photoelectronic devices.

Abstract Image

钙钛矿单晶薄膜中的超快载流子扩散
与多晶钙钛矿相比,单晶钙钛矿材料具有更优越的性能,包括更低的缺陷密度、最小的晶界和更高的载流子迁移率。然而,制备大面积、高质量的单晶薄膜仍然是一个重大的挑战,它可能被证明是光电子应用的宝贵资源。关于它们的独特性质如何超越多晶薄膜的研究仍然缺失。本实验利用偏振选择性瞬态吸收显微镜,直接观察了甲基碘化铅铵(CH3NH3PbI3, MAPbI3)条形单晶超薄膜中载流子的空间输运。观察到超高速载流子扩散输运。单晶载流子扩散系数D (~ 22 cm2 s-1)比多晶薄膜中的扩散系数高一个数量级。发现了MAPbI3单晶载流子的各向异性扩散。同时发现电子和空穴具有不同的各向异性和扩散速度。这种单晶薄膜内部的超长载流子输运为钙钛矿基光电器件的发展提供了坚实的支撑。
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来源期刊
The Journal of Physical Chemistry Letters
The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
9.60
自引率
7.00%
发文量
1519
审稿时长
1.6 months
期刊介绍: The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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