Determining In-Plane Carrier Diffusion in Two-Dimensional Perovskite Using Local Time-Resolved Photoluminescence

Chunhua Zhou; Weijian Chen; Shuang Yang; Qingdong Ou; Zhixing Gan; Qiaoliang Bao; Baohua Jia; Xiaoming Wen

doi:10.1021/acsami.0c05539

Determining In-Plane Carrier Diffusion in Two-Dimensional Perovskite Using Local Time-Resolved Photoluminescence

ACS Appl Mater Interfaces. 2020 Jun 10;12(23):26384-26390. doi: 10.1021/acsami.0c05539. Epub 2020 May 27.

Authors

Chunhua Zhou¹, Weijian Chen¹, Shuang Yang², Qingdong Ou³, Zhixing Gan⁴, Qiaoliang Bao³, Baohua Jia¹, Xiaoming Wen¹

Affiliations

¹ Centre for Translational Atomaterials, Faculty of Science, Engineering and Technology, Swinburne University of Technology, John Street, Hawthorn, Melbourne, Victoria 3122, Australia.
² School of Materials Science and Engineering, Shandong University, Jinan, Shandong 250100, China.
³ Department of Materials Science and Engineering, and ARC Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET), Monash University, Scenic Blvd & Wellington Road, Clayton, Victoria 3800, Australia.
⁴ Key Laboratory of Optoelectronic Technology of Jiangsu Province, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China.

PMID: 32400152
DOI: 10.1021/acsami.0c05539

Abstract

The diffusion length of photogenerated carriers is a crucial parameter in semiconductors for optoelectronic applications. However, it is a challenging task to determine the diffusion length in layered nanoplatelets due to their anisotropic diffusion of photogenerated carriers and nanometer-thin thickness. Here, we demonstrate a novel method to determine the in-plane diffusion length of photogenerated carriers in layered nanoplatelets using local time-resolved photoluminescence. Also, the in-plane carrier diffusion length of 1.82 μm is obtained for an exfoliated (BA)₂PbI₄ (BA = CH₃(CH₂)₃NH₃) perovskite nanoplatelet. This method is particularly useful for weak luminescent materials and the materials that are easily damaged by long-term laser beam because of the high detection sensitivity. This technique is extendable to other layered materials and therefore plays a valuable role in the development and optimization of two-dimensional (2D) and three-dimensional (3D) semiconductor materials and devices for photovoltaic and photonic applications.

Keywords: diffusion length; edge-trapping state; surface recombination velocity; time-resolved photoluminescence; two-dimensional (2D) Ruddlesden−Popper perovskites (RPPs) nanoplatelet.