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arXiv · 1508.05171

Synthesis of thin-film black phosphorus on a flexible substrate

Xuesong Li·Bingchen Deng·Xiaomu Wang·Sizhe Chen·Michelle Vaisman·Shun-ichiro Karato·Grace Pan·Minjoo Larry Lee·Judy Cha·Han Wang·Fengnian Xia
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Abstract

We report a scalable approach to synthesize a large-area (up to 4 mm) thin black phosphorus (BP) film on a flexible substrate. We first deposited a red phosphorus (RP) thin-film on a flexible polyester substrate, followed by its conversion to BP in a high-pressure multi-anvil cell at room temperature. Raman spectroscopy and transmission electron microscopy measurements confirmed the formation of a nano-crystalline BP thin-film with a thickness of around 40 nm. Optical characterization indicates a bandgap of around 0.28 eV in the converted BP, similar to the bandgap measured in exfoliated thin-films. Thin-film BP transistors exhibit a field-effect mobility of around 0.5 cm2/Vs, which can probably be further enhanced by the optimization of the conversion process at elevated temperatures. Our work opens the avenue for the future demonstration of large-scale, high quality thin-film black phosphorus.

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Xuesong Li, Bingchen Deng, Xiaomu Wang, Sizhe Chen, Michelle Vaisman, Shun-ichiro Karato, Grace Pan, Minjoo Larry Lee, Judy Cha, Han Wang, Fengnian Xia. 2015-08-21. Synthesis of thin-film black phosphorus on a flexible substrate. https://doi.org/10.1088/2053-1583%2F2%2F3%2F031002

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