標題: Ultraviolet Photodetecting and Plasmon-to-Electric Conversion of Controlled Inkjet-Printing Thin-Film Transistors
作者: Wang, Cheng-Jyun
You, Hsin-Chiang
Ou, Jen-Hung
Chu, Yun-Yi
Ko, Fu-Hsiang
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: ink-jet printing;zinc-oxide-based thin-film transistors;visible light photodetection;oxygen plasma treatment;plasmon energy detection
公開日期: 1-Mar-2020
摘要: Direct ink-jet printing of a zinc-oxide-based thin-film transistor (ZnO-based TFT) with a three-dimensional (3-D) channel structure was demonstrated for ultraviolet light (UV) and visible light photodetection. Here, we demonstrated the channel structures by which temperature-induced Marangoni flow can be used to narrow the channel width from 318.9 +/- 44.1 mu m to 180.1 +/- 13.9 mu m via a temperature gradient. Furthermore, a simple and efficient oxygen plasma treatment was used to enhance the electrical characteristics of switching I-ON/I-OFF ratio of approximately 10(5). Therefore, the stable and excellent gate bias-controlled photo-transistors were fabricated and characterized in detail for ultraviolet (UV) and visible light sensing. The photodetector exhibited a superior photoresponse with a significant increase of more than 2 orders of magnitude larger drain current generated upon UV illumination. The results could be useful for the development of UV photodetectors by the direct-patterning ink-jet printing technique. Additionally, we also have successfully demonstrated that a metal-semiconductor junction structure that enables plasmon energy detection by using the plasmonic effects is an efficient conversion of plasmon energy to an electrical signal. The device showed a significant variations negative shift of threshold voltage under different light power density with exposure of visible light. With the ZnO-based TFTs, only ultraviolet light detection extends to the visible light wavelength.
URI: http://dx.doi.org/10.3390/nano10030458
http://hdl.handle.net/11536/154149
DOI: 10.3390/nano10030458
期刊: NANOMATERIALS
Volume: 10
Issue: 3
起始頁: 0
結束頁: 0
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