Fig. 5From: Carbon Nanotube-Silicon Nanowire Heterojunction Solar Cells with Gas-Dependent Photovoltaic Performances and Their Application in Self-Powered NO2 DetectingCNT-planar silicon structure responses to 1000 ppm NO2 exposure. a One response and recovery process of CNT-planar silicon structure. b Normalized voltage responses of CNT-SiNWs and CNT-planar silicon under repeated exposures of 1000 ppm NO2 at room temperatureBack to article page