Issue 21, 2019
From the journal:

Journal of Materials Chemistry C

A 0.05 V driven ammonia gas sensor based on an organic diode with a top porous layered electrode and an air-stable sensing film†

Govindasamy Madhaiyan,a   Chao-Hsuan Chen,b   Yi-Chu Wu,c   Sheng-Fu Horng,c   Hsiao-Wen Zan, ORCID logo *b   Hsin-Fei Meng*d  and  Hong-Cheu Lin ORCID logo *ae  

* Corresponding authors

a Department of Materials Science and Engineering, National Chiao Tung University, 1001 Ta Hsueh Rd, Hsinchu, Taiwan
E-mail: linhc@mail.nctu.edu.tw

b Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, 1001 Ta Hsueh Rd, Hsinchu, Taiwan
E-mail: hsiaowen@mail.nctu.edu.tw

c Department of Electrical Engineering, National Tsing Hua University, Taiwan

d Institute of Physics, National Chiao Tung University, 1001 Ta Hsueh Rd, Hsinchu, Taiwan
E-mail: meng@mail.nctu.edu.tw

e Center for Emergent Functional Matter Science, National Chiao Tung University, Hsinchu 30010, Taiwan

Abstract

In this work, we successfully demonstrated an extremely-low-voltage (0.05 V) gas sensor based on a vertical organic diode with work-function-matched electrodes. With the designed electrodes (MoO3/Al vs. Al), the built-in field in the vertical diode is greatly reduced and hence the diode can be turned on at a very low voltage. By producing nanometer pores in the top electrode, the diode becomes a very sensitive gas sensor to detect ammonia in parts-per-billion (ppb) concentrations. Upon reducing the voltage from 5 V to 0.05 V, this sensor device shows an over 5-times enhancement in the sensitivity. The air-stable sensing film also exhibits a lifetime of 30 days in air. Finally, by connecting with an organic photovoltaic (OPV) device, the gas sensor can be directly powered and switched on by irradiating light on the OPV.

Graphical abstract: A 0.05 V driven ammonia gas sensor based on an organic diode with a top porous layered electrode and an air-stable sensing film

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Article information

DOI
https://doi.org/10.1039/C8TC06364H
Article type
Paper
Submitted
17 Dec 2018
Accepted
28 Apr 2019
First published
29 Apr 2019

J. Mater. Chem. C, 2019,7, 6440-6447

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A 0.05 V driven ammonia gas sensor based on an organic diode with a top porous layered electrode and an air-stable sensing film

G. Madhaiyan, C. Chen, Y. Wu, S. Horng, H. Zan, H. Meng and H. Lin, J. Mater. Chem. C, 2019, 7, 6440 DOI: 10.1039/C8TC06364H

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