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Improving Wearable Photodetector Textiles via Precise Energy Level Alignment and Plasmonic Effect
Author(s) -
Zhu Zhengfeng,
Gu Yu,
Wang Shalong,
Zou Yousheng,
Zeng Haibo
Publication year - 2017
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201700281
Subject(s) - materials science , photodetector , optoelectronics , wearable technology , nanorod , nanowire , graphene , bending , fiber , plasmon , textile , wearable computer , nanotechnology , composite material , computer science , embedded system
Light‐weight and ultraflexible‐fiber‐based devices that can be woven into wearable electronic products have attracted extensive attention in recent years. However, fiber‐shaped photodetectors (PDs) made from bulky metal‐wire‐based inorganic semiconductors are prone to damage with excessive bending. Therefore, this work introduces a directly constructed photodetector textile (PDT) and realizes a large‐area, organized and dense weaving of fiber‐shaped PDs for the first time. To form the structure, ZnO nanorod arrays (NRAs) are grown uniformly on the surface of Ni wire textile to fabricate an Ni‐based ZnO NRA textile, then Ag nanowires (NWs) and graphene film (outmost layer) are successively assembled on the functional textile. The precise energy level alignment of the structure is in favor of the separation and transportation of photoinduced carriers, and Ag NWs also bring about near‐filed enhancement effect on ZnO NRAs due to local surface plasmon resonances, leading to excellent device performance. The photoresponsivity under bias of 1 V is 0.27 A W −1 , and the I light / I dark ratio calculated form the I–V curves even reaches ≈10 2 , about two orders of magnitude larger than that of the reported fiber‐shaped PDs. Meanwhile, the whole structure also exhibits excellent durability under bending operations, which is ideal for wearable applications.