Direct imaging of carrier diffusion length in organic-inorganic perovskites

The carrier diffusion length (LD) is of great relevance to the quantum efficiencies of organic-inorganic perovskites. However, so far there is no direct and noncontact measurement of the carrier diffusion length in this emerging material. Herein, we directly visualize the carrier diffusion length of...

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Bibliographic Details
Published in:	Applied physics letters 2019-12, Vol.115 (24)
Main Authors:	Liao, Zebing, Xiao, Zeqi, Yang, Mengmeng, Zhang, Menglong, Zhang, Yonghui, Gu, Huaimin, Jiang, Xiaofang, Wang, Qisheng, Li, Jingbo
Format:	Article
Language:	eng
Subjects:	Diffusion layers Diffusion length Helium Injection molding Mapping Perovskites Photoluminescence Single crystals
Online Access:	Get full text
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Summary:	The carrier diffusion length (LD) is of great relevance to the quantum efficiencies of organic-inorganic perovskites. However, so far there is no direct and noncontact measurement of the carrier diffusion length in this emerging material. Herein, we directly visualize the carrier diffusion length of organic-inorganic perovskites via spatial mapping of photoluminescence. Our results reveal that the carrier diffusion length (LD) is 6.25 μm for three-dimensional FAPbBr3 single crystals. Further, we discover that nonlinear and nonradiative effects can be neglectable during the diffusion process of photogenerated carriers in FAPbBr3 single crystals. In contrast, two-dimensional BA2PbI4 single crystals display shorter LD (2.40 μm) due to the transport barrier from their insulating organic layer. Our work simplifies the complicated operation for carrier diffusion length measurements, which is fundamentally important for technical development and scientific research on organic-inorganic perovskites.
ISSN:	0003-6951 1077-3118