A clean transfer approach to prepare centimetre-scale black phosphorus crystalline multilayers on silicon substrates for field-effect transistors

Yuqian Zhao, Jianfeng Mao, Zehan Wu, Weng Fu Io, Sin-Yi Pang, Yifei Zhao and Jianhua Hao ()
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Yuqian Zhao: The Hong Kong Polytechnic University
Jianfeng Mao: The Hong Kong Polytechnic University
Zehan Wu: The Hong Kong Polytechnic University
Weng Fu Io: The Hong Kong Polytechnic University
Sin-Yi Pang: The Hong Kong Polytechnic University
Yifei Zhao: The Hong Kong Polytechnic University
Jianhua Hao: The Hong Kong Polytechnic University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Recently reported direct growth of highly crystalline centimetre-sized black phosphorus (BP) thin films on mica substrates by pulsed laser deposition (PLD) has attracted considerable research interest. However, an effective and general transfer method to incorporate them into (opto-)electronic devices is still missing. Here, we show a wet transfer method utilizing ethylene-vinyl acetate (EVA) and an ethylene glycol (EG) solution to transfer high-crystalline large-area PLD-BP films onto SiO2/Si substrates. The transferred films were used to fabricate BP-based bottom-gate field-effect transistor (FET) arrays exhibiting good uniformity and continuity, with carrier mobility and current switching ratios comparable to those obtained in as-grown BP films on mica substrates. Our work presents a promising transfer strategy for scalable integration of on-substrate grown 2D BP into devices with more complex structures and further investigation of material properties.

Date: 2024
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DOI: 10.1038/s41467-024-51140-z

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