Improving Harsh Environmental Stability of Few-Layer Black Phosphorus by Local Charge Transfer,Advanced Functional Materials

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Improving Harsh Environmental Stability of Few-Layer Black Phosphorus by Local Charge Transfer
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-06-16 , DOI: 10.1002/adfm.202203967
Ning Wang _{1,

2,

3} , Haining Liu ₂ , Xi Zhou ₁ , Qingyuan Luo ₄ , Xue Yang ₁ , Hongyan Yang ₁ , Haibo Shu ₄ , Hua Xu ₅ , Qiuyu Zhang ₁ , Diane Hildebrandt ₃ , Xinying Liu ₆ , Shanlin Qiao ₂ , Bilu Liu ₇ , Qingliang Feng ₁

Affiliation

Few-layer black phosphorus (FL-BP) is a promising high-mobility semiconductor with thickness-dependent direct bandgap varying from visible to mid-infrared region. The poor stability under harsh environment, stemming from irreversible oxidization of P atoms with lone pair electrons, restricts its practical applications. Herein, an electrochemical intercalation and in situ electrochemical deposition (EI&ED) approach to produce scalable Au nanoparticles/FL-BP crystals with enhanced stability in harsh environment is developed. In this approach, the chemical reactivity of BP is significantly suppressed via the efficient local charge transfer from FL-BP to electrochemically deposited Au nanoparticles. Thus obtained Au/FL-BP based nano-devices show good stability under harsh environment, including i) high humidity of 95%, ii) immersibility in organic agents for as long as 45 days, and iii) annealing at 573 K for 9 h. In addition, compared to bare FL-BP crystals, Au/FL-BP based photodetectors present 50- and 36-fold improvement of photoresponsivity at 1550 and 1850 nm via the surface plasmonic enhancement effect. This EI&ED method can produce ultra-stable FL-BP crystals at large-scale, which resolves the crucial barriers in using FL-BP in large-scale electronic and optoelectronic devices.

中文翻译：

通过局部电荷转移提高少层黑磷的恶劣环境稳定性

少层黑磷（FL-BP）是一种很有前途的高迁移率半导体，具有从可见光到中红外区域变化的厚度依赖的直接带隙。由于 P 原子与孤对电子的不可逆氧化，在恶劣环境下的稳定性差，限制了其实际应用。在此，开发了一种电化学插层和原位电化学沉积 (EI&ED) 方法来生产可扩展的 Au 纳米颗粒/FL-BP 晶体，在恶劣环境中具有增强的稳定性。在这种方法中，通过从 FL-BP 到电化学沉积的 Au 纳米颗粒的有效局部电荷转移，BP 的化学反应性被显着抑制。由此获得的基于 Au/FL-BP 的纳米器件在恶劣环境下表现出良好的稳定性，包括 i) 95% 的高湿度，ii) 在有机试剂中浸泡长达 45 天，以及 iii) 在 573 K 下退火 9 小时。此外，与裸 FL-BP 晶体相比，基于 Au/FL-BP 的光电探测器通过表面等离子体增强效应在 1550 和 1850 nm 处的光响应度提高了 50 倍和 36 倍。这种EI&ED方法可以大规模生产超稳定的FL-BP晶体，解决了在大规模电子和光电器件中使用FL-BP的关键障碍。

更新日期：2022-06-16

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