Liu Xi, Gu Leilei, Zhang Qianpeng, Wu Jiyuan, Long Yunze, Fan Zhiyong
Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
1] Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China [2].
Nat Commun. 2014 Jun 5;5:4007. doi: 10.1038/ncomms5007.
High-performance photodetectors are critical for high-speed optical communication and environmental sensing, and flexible photodetectors can be used for a wide range of portable or wearable applications. Here we demonstrate the all-printable fabrication of polycrystalline nanowire-based high-performance photodetectors on flexible substrates. Systematic investigations have shown their ultra-high photoconductive gain, responsivity and detectivity up to 3.3 × 10(17) Jones. Further analysis shows that their high performance originates from the unique band-edge modulation along the nanowire axial direction, where the existence of Schottky barriers in series leads to highly suppressed dark current of the device and also gives rise to fast photoelectric response to low-intensity optical signal owing to barrier height modulation. The discovered rationale in this work can be utilized as guideline to design high-performance photodetectors with other nanomaterial systems. The developed fabrication scheme opens up possibility for future flexible and high-performance integrated optoelectronic sensor circuitry.
高性能光电探测器对于高速光通信和环境传感至关重要，而柔性光电探测器可用于广泛的便携式或可穿戴应用。在此，我们展示了在柔性基板上全印刷制造基于多晶纳米线的高性能光电探测器。系统研究表明，其具有高达3.3×10(17)琼斯的超高光电导增益、响应度和探测率。进一步分析表明，其高性能源于沿纳米线轴向独特的带边调制，串联肖特基势垒的存在导致器件暗电流受到高度抑制，并且由于势垒高度调制，对低强度光信号产生快速光电响应。这项工作中发现的原理可作为设计其他纳米材料系统高性能光电探测器的指导原则。所开发的制造方案为未来柔性和高性能集成光电传感器电路开辟了可能性。
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