Effect of polyethylenimine on morphology and photovoltaic property of ZnO nanowire array films

The effect of polyethylenimine(PEI) concentration on the morphology,wire density and size of ZnO nanowire arrays was systematically studied by X-ray diffraction(XRD),transmission electron microscopy(TEM) and scanning electron microscope(SEM).The photovoltaic properties of ZnO nanowire array films were also investigated.It is demonstrated that,for a ZnO nanowire array film obtained from 7.3 mmol·L^-1 PEI,an energy conversion efficiency of about 0.66% was obtained,which is the highest for ZnO nanowire array films prepared with different PEI concentrations from 3.2 mmol·L^-1 to 9.3 mmol·L^-1.