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Research Article

Improving the band alignment at PtSe2 grain boundaries with selective adsorption of TCNQ

Yanhui Hou1,§, Ziqiang Xu1,§, Yan Shao2, Linlu Wu3, Zhongliu Liu2, Genyu Hu1, Wei Ji3, Jingsi Qiao1( ), Xu Wu1( ), Hong-Jun Gao2, Yeliang Wang1( )
MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Integrated Circuits and Electronics, Beijing Institute of Technology, Beijing 100081, China
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China

§ Yanhui Hou and Ziqiang Xu contributed equally to this work.

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Graphical Abstract

The selective adsorption of tetracyanoquinodimethane (TCNQ) molecules can improve the band alignment at the PtSe2 grain boundary.

Abstract

Grain boundaries in two-dimensional (2D) semiconductors generally induce distorted band alignment and interfacial charge, which impair their electronic properties for device applications. Here, we report the improvement of band alignment at the grain boundaries of PtSe2, a 2D semiconductor, with selective adsorption of a presentative organic acceptor, tetracyanoquinodimethane (TCNQ). TCNQ molecules show selective adsorption at the PtSe2 grain boundary with strong interfacial charge. The adsorption of TCNQ distinctly improves the band alignment at the PtSe2 grain boundaries. With the charge transfer between the grain boundary and TCNQ, the local charge is inhibited, and the band bending at the grain boundary is suppressed, as revealed by the scanning tunneling microscopy and spectroscopy (STM/S) results. Our finding provides an effective method for the advancement of the band alignment at the grain boundary by functional molecules, improving the electronic properties of 2D semiconductors for their future applications.

Keywords

organic-two-dimensional (2D) heterostructurePtSe2grain boundaryband alignmentscanning tunneling microscopy (STM)

Electronic Supplementary Material

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Nano Research
Volume 16 Issue 2,
February 2023
Pages 3358-3363
DOI: 10.1007/s12274-022-5009-8
Cite this article:
Hou Y, Xu Z, Shao Y, et al. Improving the band alignment at PtSe2 grain boundaries with selective adsorption of TCNQ. Nano Research, 2023, 16(2): 3358-3363. https://doi.org/10.1007/s12274-022-5009-8
Topics:
DepositionNanostructuresScanning tunneling microscopy

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Received: 24 June 2022
Revised: 09 August 2022
Accepted: 03 September 2022
Published: 21 October 2022
© Tsinghua University Press 2022
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