瞬態可撓光感測器

Abstract

隨著科技的快速發展，電子設備在我們的日常生活中已無所不在，也因此帶給人類生活中各個方面的便利。然而，電子垃圾成為一個巨大的環境負擔，造成日益嚴重的生態問題。為了人類的生存，必須發展新的技術來替代傳統生產電子元件的技術。近年來瞬態電子元件技術引起了極大的關注，瞬態裝置能在不同物理條件下，在一定時間內消失的一種電子元件製備技術，這顛覆了人們對電子元件的理解，對於生物醫學及軍事應用將具有非常廣闊的應用前景。在此項研究中，我們展示了在聚乙烯醇基板上使用石墨烯和葉綠素混合物的可溶解環保柔性光感測器。整個裝置具有高光響應度，並且能在一般環境條件下消失在水溶液中。由於石墨烯的高電子遷移率以及葉綠素的高強度吸收形成光子捕捉層，在紅光照明之下，元件具有低於一秒的響應時間和具有高達約200WA-1的光響應度，並且光電流增益高達1000。這個新設計的光感測器幾乎不會產生任何的電子垃圾，對環境影響極小，也使得生態環境永續發展產生前所未有的幫助。

With the rapid development of technology, electronic devices have become omnipresent in our daily life as it brought much convenience in every aspect of human activity. Side-by-side, the electronic waste (e-waste) has become a global environmental burden creating an ever-growing ecological problem. For the sustenance of human race, an alternative to the traditional technology must be developed. Along this guideline, the transient device technology in which the devices can physically disappear completely in different environmental conditions has attracted a widespread attention in recent years owing to its emerging application potential spanning from bio-medical to military use. In this work, we demonstrated the first attempt of a dissolvable eco-friendly flexible photodetector using a hybrid of graphene and chlorophyll on poly(vinyl alcohol) substrate. The whole device can physically disappear in aqueous solutions in a time span of ~30 minutes, while it shows a photoresponsivity of ~ 200 AW-1 under ambient conditions. The high carrier mobility of graphene and strong absorption strength of green photon harvesting layer, chlorophyll, result in the photocurrent gain of the device as high as 103 with subsecond response time, under the illumination of red light. The newly designed photodetector shown here yields zero-waste with a minimum impact on the environment, which is very useful for the development of the sustainability of our planet.