自驅動暨自癒合之可穿戴式紫外光感測器

Self-powered and Self-healed Wearable UV Photodetectors

蔡孟憲(Meng-Shian Tsai)

指導教授 ： 陳永芳

國立臺灣大學/理學院/物理學研究所/碩士(2019年)

https://doi.org/10.6342/NTU201903309

摘要

「自癒合」元件是一種能在受到外力破壞後，能自行恢復其初始功能的元件，故其可運用範圍之廣泛，引起了科學界的高度興趣。然而，迄今為止大部分的研究主要集中於初步之自癒合聚合物的凝膠化，而較少更進一步地著墨於自癒合電子元件之設計。本研究中，我們首先整合奈米銀線 （Ag NW）、半導體奈米粒子和洋菜醣/聚乙烯醇（agarose/PVA）水凝膠來製造自驅動與自癒合紫外光感測器。本元件的自驅動能力歸因於紫外光照射產生的光致載子受「聚二氧乙基噻吩：聚苯乙烯磺酸」（PEDOT：PSS）/氧化鋅奈米粒子（ZnO NP）界面處產生之內建電場驅動分離而產生光電流。在325奈米波段的紫外光照射下，元件的光響應度隨著較低的照度而增加至19 mA W^(-1)，同時探測率可高達 8×〖10〗^11 Jones；而在元件破裂—癒合測試循環多次後，光電流仍能保有約 90±10 ％ 的效率恢復。這個首次演示可應用在電子肌膚上的自驅動與自癒合紫外光感測器，替可穿戴及可拉伸電子元件開闢了具前瞻性的各種領域應用。

關鍵字

光感測器 ； 自驅動 ； 自癒合 ； 洋菜醣 ； 聚乙烯醇 ； 水凝膠

並列摘要

Self-healed devices, which are able to restore their initial functionalities after deterioration, have a broad range of applications, attract considerable interest. However, the majority of research to date is still mainly focused on the exploration of new gelation of self-healed polymers instead of the design of new self-healed electronic devices. Here we present the first attempt of a self-powered and self-healed ultraviolet (UV) photodetector based on the integration of silver nanowires (Ag NWs) electrodes, semiconductor nanoparticles, and agarose/poly(vinyl alcohol) (PVA) double network (DN) hydrogels. Self-powered capacity is attributed to the separation of photo-induced carriers within the built-in electric field at the poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/zinc oxide (ZnO) nanoparticles interface upon UV illumination. The responsivity was shown to increase with lower illumination intensity up to 19 mA W^(-1) with a specific detectivity 8×〖10〗^11 Jones under 325 nm UV illumination intensity of 2.74 μW. On rupture, the initial photocurrent can be repeatedly restored with ∼ 90±10 % efficiency after several times of healing cycles. The first demonstrated self-powered and self-healed UV photodetector has a great promising for the development of smart electronic skins.

並列關鍵字

photodetector ； self-powered ； self-healed ； agarose ； PVA ； hydrogels

參考文獻

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