2D transition metal dichalcogenides (TMDs) have attracted much attention for their gas sensing applications due to their superior responsivity at typical room temperature. However, low power consumption and reliable selectivity are the two main requirements for gas sensors to be applicable in future electronic devices. Herein, a p-type (WSe2/WS2) and n-type (MoS2/WSe2) photovoltaic self-powered gas sensor is demonstrated using 2D TMD heterostructures for the first time. The gas sensors are operated by the photovoltaic effect of 2D TMD heterostructures, which are uniformly synthesized by the vacuum-based synthesis. The gas sensing properties of the WSe2/WS2 and MoS2/WSe2 heterostructure gas sensors are investigated for NO2 and NH3 with changing gas concentration, and each sensor exhibits selectivity to NO2 and NH3. From the results, it is confirmed that the 2D TMD heterostructures can be a viable platform for highly sensitive, selective gas sensor applications without external bias due to their photovoltaic features. Further, this study contributes toward revealing the gas sensor mechanism in 2D TMD heterostructure.
Bibliographical noteFunding Information:
Y. Kim and S. Lee equally contributed to this work. This work was supported by the Materials and Components Technology Development Program of MOTIE/KEIT. [10080527, Development of commercialization technology of highly sensitive gas sensor based on chalcogenide 2D nanomaterial]; Samsung Display CO., LTD.; and by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF‐2018R1D1A1A09084143 and NRF‐2017R1C1B5076821), and by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT) (No. NRF‐2018R1A2B6005289). This research was also supported by the MOTIE(Ministry of Trade, Industry & Energy, No. 20006504 and No. 20007000) and KSRC(Korea Semiconductor Research Consortium) support program for the development of the future semiconductor device.
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics