材料科学
剥脱关节
拉曼光谱
薄膜
蓝宝石
黑磷
微晶
光电子学
化学工程
纳米技术
石墨烯
光学
冶金
物理
工程类
激光器
作者
Cheng Li,Ye Wu,Bingchen Deng,Yujun Xie,Qiushi Guo,Shaofan Yuan,Xiaolong Chen,Mansurul Bhuiyan,Ziqi Wu,Kenji Watanabe,Takashi Taniguchi,Hailiang Wang,J. Judy,Michael Snure,Yingwei Fei,Fengnian Xia
标识
DOI:10.1002/adma.201703748
摘要
Black phosphorus (BP) has recently attracted significant attention due to its exceptional physical properties. Currently, high-quality few-layer and thin-film BP are produced primarily by mechanical exfoliation, limiting their potential in future applications. Here, the synthesis of highly crystalline thin-film BP on 5 mm sapphire substrates by conversion from red to black phosphorus at 700 °C and 1.5 GPa is demonstrated. The synthesized ≈50 nm thick BP thin films are polycrystalline with a crystal domain size ranging from 40 to 70 µm long, as indicated by Raman mapping and infrared extinction spectroscopy. At room temperature, field-effect mobility of the synthesized BP thin film is found to be around 160 cm2 V-1 s-1 along armchair direction and reaches up to about 200 cm2 V-1 s-1 at around 90 K. Moreover, red phosphorus (RP) covered by exfoliated hexagonal boron nitride (hBN) before conversion shows atomically sharp hBN/BP interface and perfectly layered BP after the conversion. This demonstration represents a critical step toward the future realization of large scale, high-quality BP devices and circuits.
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