Fig. 1From: Carbon Nanotube-Silicon Nanowire Heterojunction Solar Cells with Gas-Dependent Photovoltaic Performances and Their Application in Self-Powered NO2 DetectingCharacterization of CNT-SiNW solar cells. a Schematic diagram of the CNT-SiNW solar cells. b SEM images of CNT-SiNW heterostructures. c Reflection spectra of polished silicon wafer and SiNW arrays. d Photographs of polished silicon wafer (left) and SiNW arrays (right)Back to article page