Open AccessA Photovoltaic Self‐Powered Gas Sensor Based on All‐Dry Transferred MoS 2 /GaSe Heterojunction for ppb‐Level NO 2 Sensing at Room Temperature
Author(s) -
Niu Yue,
Zeng Junwei,
Liu Xiangcheng,
Li Jialong,
Wang Quan,
Li Hao,
Rooij Nicolaas Frans de,
Wang Yao,
Zhou Guofu
Publication year - 2021
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202100472
Subject(s) - photovoltaic system , heterojunction , materials science , optoelectronics , internet of things , exfoliation joint , electrical engineering , response time , nanotechnology , computer science , embedded system , engineering , computer graphics (images) , graphene
Abstract Traditional gas sensors are facing the challenge of low power consumption for future application in smart phones and wireless sensor platforms. To solve this problem, self‐powered gas sensors are rapidly developed in recent years. However, all reported self‐powered gas sensors are suffering from high limit of detection (LOD) toward NO 2 gas. In this work, a photovoltaic self‐powered NO 2 gas sensor based on n‐MoS 2 /p‐GaSe heterojunction is successfully prepared by mechanical exfoliation and all‐dry transfer method. Under 405 nm visible light illumination, the fabricated photovoltaic self‐powered gas sensors show a significant response toward ppb‐level NO 2 with short response and recovery time and high selectivity at room temperature (25 °C). It is worth mentioning that the LOD toward NO 2 of this device is 20 ppb, which is the lowest of the reported self‐powered room‐temperature gas sensors so far. The discussed devices can be used as building blocks to fabricate more functional Internet of things devices.