Sensors | |
Achieving a Good Life Time in a Vertical-Organic-Diode Gas Sensor | |
Ming-Zhi Dai1  Yen-Ho Chen1  Ming-Yen Chuang2  Hsiao-Wen Zan2  | |
[1] Institute of Physics, National Chiao Tung University, Hsinchu 300, Taiwan; E-Mails:;Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 300, Taiwan; E-Mail: | |
关键词: ammonia; gas sensor; polythiophene; solid-state sensors; | |
DOI : 10.3390/s140916287 | |
来源: mdpi | |
【 摘 要 】
In this study, we investigate the keys to obtain a sensitive ammonia sensor with high air stability by using a low-cost polythiophene diode with a vertical channel and a porous top electrode. Poly(3-hexylthiophene) (P3HT) and air-stable poly(5,5′-bis(3-dodecyl-2-thienyl)-2,2′-bithiophene) (PQT-12) are both evaluated as the active sensing layer. Two-dimensional current simulation reveals that the proposed device exhibits numerous connected vertical nanometer junctions (VNJ). Due to the de-doping reaction between ammonia molecules and the bulk current flowing through the vertical channel, both PQT-12 and P3HT VNJ-diodes exhibit detection limits of 50-ppb ammonia. The P3HT VNJ-diode, however, becomes unstable after being stored in air for two days. On the contrary, the PQT-12 VNJ-diode keeps an almost unchanged response to 50-ppb ammonia after being stored in air for 25 days. The improved storage lifetime of an organic-semiconductor-based gas sensor in air is successfully demonstrated.
【 授权许可】
CC BY
© 2014 by the authors; licensee MDPI, Basel, Switzerland.
【 预 览 】
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RO202003190022027ZK.pdf | 4514KB | download |