WO3-WS2 Vertical Bilayer Heterostructures with High Photoluminescence Quantum Yield,Journal of the American Chemical Society

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WO3-WS2 Vertical Bilayer Heterostructures with High Photoluminescence Quantum Yield
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2019-07-12 , DOI: 10.1021/jacs.9b03453
Biyuan Zheng _{1,

2} , Weihao Zheng ₂ , Ying Jiang ₂ , Shula Chen ₁ , Dong Li ₁ , Chao Ma ₁ , Xiaoxia Wang ₂ , Wei Huang ₂ , Xuehong Zhang ₂ , Huawei Liu ₂ , Feng Jiang ₂ , Lihui Li ₂ , Xiujuan Zhuang ₂ , Xiao Wang ₂ , Anlian Pan _{1,

2}

Affiliation

Atomically thin two-dimensional (2D) transition metal dichalcogenides (TMDCs) are attractive for applications in a wide range of optoelectronic devices, due to their tremendous interesting physical properties. However, the photoluminescence quantum yield (PLQY) of TMDCs has been found to be too low, due to abundant defects and strong many-body effect. Here, we present a direct physical vapor growth of WO3-WS2 bilayer heterostructures, with WO3 monolayer domains attached on the surface of large-size WS2 monolayers. Optical characterizations revealed that the PLQY of the as-grown bilayer WO3-WS2 heterostructures can reach up to 11.6 %, which is two orders of magnitude higher than that of WS2 monolayers by physical vapor deposition growth method (PVD-WS2) and about 13-times higher than that of mechanical exfoliated WS2 (ME-WS2) monolayers, representing the highest PLQY reported for direct growth TMDCs materials so far. The PL enhancement mechanism has been well investigated by time-resolved optical measurements. The fabrication of WO3-WS2 heterostructures with ultra-high PLQY provides an efficient approach for the development of highly efficient 2D integrated photonic applications.

中文翻译：

具有高光致发光量子产率的 WO3-WS2 垂直双层异质结构

原子级薄的二维 (2D) 过渡金属二硫属化物 (TMDC) 由于其惊人的有趣物理特性而在广泛的光电器件中具有吸引力。然而，已发现 TMDC 的光致发光量子产率 (PLQY) 太低，这是由于缺陷丰富和多体效应强。在这里，我们提出了 WO3-WS2 双层异质结构的直接物理气相生长，WO3 单层域附着在大尺寸 WS2 单层的表面上。光学表征表明，生长的双层 WO3-WS2 异质结构的 PLQY 可达 11.6%，比物理气相沉积生长法 (PVD-WS2) 的 WS2 单层高两个数量级，约 13-比机械剥离的 WS2 (ME-WS2) 单层高倍，代表迄今为止报告的直接生长 TMDCs 材料的最高 PLQY。PL 增强机制已经通过时间分辨光学测量得到了很好的研究。具有超高 PLQY 的 WO3-WS2 异质结构的制造为开发高效的二维集成光子应用提供了一种有效的方法。

更新日期：2019-07-12

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