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High-Performance Photovoltaic Hydrogen Sensing Platform with a Light-Intensity Calibration Module
journal contribution
posted on 2020-04-06, 14:11 authored by Hyeonghun Kim, Woochul Kim, Ryeri Lee, Sungjun Cho, Jiyoon Park, Yusin Pak, Gun Young JungAlthough
battery-free gas sensors (e.g., photovoltaic
or triboelectric sensors) have recently appeared to resolve the power
consumption issue of conventional chemiresistors, severe technical
barriers still remain. Especially, their signals varying under ambient
conditions such as light intensity restrict the utilization of these
sensors. Insufficient sensing performances (low response and slow
sensing rate) of previous battery-free sensors are also an obstacle
for practical use. Herein, a photovoltaic hydrogen (H2)-sensing
platform having constant sensing responses regardless of light conditions
is demonstrated. The platform consists of two photovoltaic units:
(1) a palladium (Pd)-decorated n-IGZO/p-Si photodiode covered with a microporous zeolitic imidazolate framework-8
(ZIF-8) film and (2) a device with the same configuration, but without
the Pd catalyst as a reference to calibrate the base current of sensor
(1). The platform after calibration yields accurate response values
in real time regardless of unknown irradiance. Besides, the sensing
performances (e.g., sensing response of 1.57 ×
104% at 1% H2 with a response time <15 s)
of our platform are comparable with those of the conventional resistive
H2 sensors, which yield unprecedented results in photovoltaic
H2 sensors.
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Si photodiodeplatformLight-Intensity Calibration ModuleZIFambient conditionsphotovoltaic unitsmicroporous zeolitic imidazolate framework -8response valuesHigh-Performance Photovoltaic HydrogenPd catalystphotovoltaic hydrogentriboelectric sensorspower consumption issuebattery-free sensorslight conditionsbattery-free gas sensorslight intensityphotovoltaic H 2 sensorsIGZOcalibration yieldsH 2 sensors
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