Abstract With the increasing requirement of the hydrogen energy storage and chemical reactant, it gets to be emergent to exploit room-temperature high-performance hydrogen sensors. By designing a gasochromic-Pd-WO3/graphene/Si tandem structure, here we report an optoelectronic hydrogen sensor, which is working at the room temperature. In this device architecture, the graphene/Si acts as a photodetector layer by using its photovoltaic property and the tandem Pd-WO3 film serves as a hydrogen gas sensing layer by using its gasochromic behavior. While the device is exposed to the hydrogen gas, the transmittance of the Pd-WO3 can be tuned, which is synchronously sensed by the graphene/Si photodetector. With this principle, the device can detect the hydrogen gas with the concentration down to 0.05 vol% and the response time less than 13 s and the recovery time less than 43 s. This indicates that it is promising to develop the tandem gasochromic-Pd-WO3/graphene/Si structure for room-temperature high-performance low-cost hydrogen sensors.

中文翻译：

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用于室温高性能光电氢传感器的串联气致变色-Pd-WO 3 /石墨烯/硅器件

摘要 随着对氢能储存和化学反应物的要求不断提高，开发室温高性能的氢传感器成为当务之急。通过设计气致变色-Pd-WO3/石墨烯/Si 串联结构，我们报告了一种在室温下工作的光电氢传感器。在这种器件架构中，石墨烯/硅利用其光伏特性作为光电探测器层，串联 Pd-WO3 薄膜利用其气致变色行为作为氢气传感层。当器件暴露在氢气中时，可以调节 Pd-WO3 的透射率，这由石墨烯/硅光电探测器同步检测。根据这个原理，该装置可以检测到浓度低至0的氢气。05 vol%，响应时间小于 13 s，恢复时间小于 43 s。这表明开发用于室温高性能低成本氢传感器的串联气致变色-Pd-WO3/石墨烯/Si结构是有希望的。