The gap between the outstanding electrical and optical properties of an individual single-walled carbon nanotube (SWNT) and inferior performance of macro-scale SWNT devices is hindering its widespread applications.The smart assembly is necessary to play SWNT to its full potential.Here, we propose a self-assembled micro-honeycomb network (μt-HN) of SWNTs obtained by water or ethanol vapor treatment of as-synthesized vertically aligned SWNTs (VA-SWNTs) for heterojunction solar cells with higher performance.The VA-SWNTs was synthesized by the standard alcohol-catalytic CVD method with Co/Mo dip-coated on Si/SiO2 substrate [1].