Key Laboratory of Advanced Display Materials and Devices, Ministry of Industry and Information Technology, Institute of Optoelectronics & Nanomaterials, College of Material Science and Engineering, Nanjing University of Science and Technology , Nanjing, 210094 China.
School of Electronic Science and Applied Physics and Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology Hefei, Anhui 230009, China.
ACS Appl Mater Interfaces. 2017 Apr 5;9(13):12092-12099. doi: 10.1021/acsami.7b00811. Epub 2017 Mar 27.
Lightweight, flexible fiber-shaped devices that can be woven into wearable electronic products have received great attention in recent years. However, the bending and poor interfaces of fiber-shaped devices typically lead to ineluctable performance degradation, which is still a great challenge yet to be dealt with. Here, taking a fiber-shaped photodetector as an example, we proposed an effective strategy, constructing inorganic-organic-graphene hybrid interfaces on a single fiber, to greatly improve the performances of fiber-shaped device. In the proposed structure, the ZnO nanorod array is grown vertically on the surface of a Zn wire (center core) and then wrapped by PVK and graphene (outmost layer) as the two outer layers. These "soft" interfaces successfully built compact contacts between various functional layers even on curved interfaces, which markedly reduced the contact resistance. Meanwhile, the whole structure also exhibited excellent durability toward the bending operations. Evidently, the I/I ratio and photoresponsivity under bias of 0.5 V are as high as 7.2 and 0.9 A/W. In particular, the photoresponse speed has been greatly improved with the rise time of 280 ms, which was 1 order of magnitude faster than that of other fiber-shaped photodetectors without the above "soft" interfaces.
近年来，能够编织到可穿戴电子产品中的轻量级、灵活的纤维状器件受到了极大关注。然而，纤维状器件的弯曲和较差的界面通常会导致不可避免的性能下降，这仍然是一个亟待解决的巨大挑战。在这里，我们以纤维状光电探测器为例，提出了一种有效的策略，即在单根纤维上构建无机-有机-石墨烯混合界面，从而大大提高纤维状器件的性能。在提出的结构中，ZnO 纳米棒阵列垂直生长在 Zn 线（中心核）的表面，然后用 PVK 和石墨烯（最外层）包裹作为外两层。这些“软”界面即使在弯曲的界面上也成功地在各个功能层之间建立了紧密的接触，从而显著降低了接触电阻。同时，整个结构在弯曲操作下也表现出优异的耐用性。显然，在 0.5 V 偏压下的 I/I 比和光响应率高达 7.2 和 0.9 A/W。特别是，光响应速度大大提高，上升时间为 280 ms，比没有上述“软”界面的其他纤维状光电探测器快 1 个数量级。
