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journal article·2022-07Open access

Designable Layer Edge States in Quasi‐2D Perovskites Induced by Femtosecond Pulse Laser

Yu Miao, Zeqi Xiao, Zeyu Zheng, Da Lyu, Qin Liu, Jieyu Wu, Yongbo Wu, Xiewen Wen, Lingling Shui, Xiaowen Hu, Kai Wang, Zhilie Tang, Xiao‐Fang Jiang

Advanced Science· Volume 9· Issue 20
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Source abstract

Abstract

Abstract The low‐energy layer edge states (LESs) from quasi 2D hybrid perovskite single crystals have shown great potential because of their nontrivial photoelectrical properties. However, the underlying formation mechanism of the LESs still remains controversial. Also, the presence or creation of the LESs is of high randomness due to the lack of proper techniques to manually generate these LESs. Herein, using a single crystals platform of quasi‐2D (BA)2(MA)n−1PbnI3n+1 (n > 1) perovskites, the femtosecond laser ablation approach to design and write the LESs with a high spatial resolution is reported. Fundamentally, these LESs are of smaller bandgap 3D MAPbI3 nanocrystals which are formed by the laser‐induced BA escaping from the lattice and thus the lattice shrinkage from quasi‐2D to 3D structures. Furthermore, by covering the crystal with tape, an additional high‐energy emission state corresponding to the reformation of (BA)2PbI4 (n = 1) within the irradiation region is generated. This work presents a simple and efficient protocol to manually write LESs on single crystals and thus lays the foundation for utilizing these LESs to further enhance the performance of future photoelectronic devices.
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Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratory of Quantum Engineering and Quantum Material School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510006 P. R. China

Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and Engineering South China Normal University Guangzhou 510006 P. R. China

Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 P. R. China

Department of Mechanical Engineering City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong

Materials Research Institute Pennsylvania State University University Park PA 16802 USA

Funding

National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · Pennsylvania State University

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