Black phosphorus (BP) has attracted great attentions in the last few years, but their applications in optoelectronics have been strongly hindered by the poor environmental stability, especially under light irradiation. Herein, the fabrication of surface passivated few‐layer BP assisted by polymer ionic liquids (PILs) is reported. The PIL‐modified 2D BP exhibits excellent stability under ambient conditions, with negligible deterioration in 100 d. Furthermore, the PILs attached on the BP surface provide reliable and flexible electrical contact between the few‐layer BP and other device components. As a proof of concept, PIL‐modified BP nanosheets are successfully applied in flexible photodetectors, which show high flexibility, good detectivity with no obvious performance deterioration in 120 h. This work demonstrates that the PIL modification can endow BP nanosheets with excellent environmental stability and good conductivity, so that may significantly expand the applications of BP in flexible optoelectronics.

中文翻译：

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聚合物离子液体稳定的黑磷，用于环境稳健的柔性光电

在过去的几年中，黑磷（BP）备受关注，但由于其环境稳定性差，特别是在光照射下，其在光电子学中的应用受到了极大的阻碍。本文报道了在聚合物离子液体（PIL）的辅助下表面钝化的多层BP的制备。经PIL改性的2D BP在环境条件下表现出出色的稳定性，在100 d内的劣化可忽略不计。此外，附着在BP表面上的PIL在多层BP与其他设备组件之间提供了可靠而灵活的电接触。作为概念验证，PIL修饰的BP纳米片成功应用于挠性光电探测器中，该探测器具有很高的柔韧性，良好的检测能力，并且在120小时内性能没有明显下降。